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Flexible three-axial tactile sensors with microstructure-enhanced piezoelectric effect and specially-arranged piezoelectric arrays EI SCIE Scopus
期刊论文 | 2018 , 27 (2) | SMART MATERIALS AND STRUCTURES
WoS CC Cited Count: 3
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Abstract :

Flexible tactile sensors with high sensitivity, good flexibility and the capability of measuring multidirectional forces are urgently required in modern robot technology and flexible electronic applications. Here, we present a flexible three-axial tactile sensor using piezoelectricity enhanced P(VDF-TrFE) micropillars. For achieving three-axis force measurement, the vertical aligned P(VDF-TrFE) micropillars are sandwiched between four square bottom electrodes and a common top electrode to form four symmetrically arranged piezoelectric sensing units. An elastomeric PDMS bump is fixed on the common top electrode surface to effectively transfer the contact force to the four sensing units. Taking advantage of the high sensitivity and good flexibility of the imprinted P(VDF-TrFE) micropillars, the resultant four distributed piezoelectric units are highly sensitive to the strain and can generate related signals corresponding to the compressive and tensile stress, from which the direction and the amplitude of the applied force can be deduced. The structural design, manufacturing technique, the three-axial force measuring principle, and sensing performance characterization of the proposed tactile sensor are presented in this paper. The sensitivities for X-, Y-, and Z-axis force components are calibrated as 0.3738 V N-1, 0.4146 V N-1, and 0.3443 V N-1 in experimental study. Furthermore, the proposed tactile sensor array is successfully integrated with a magnetic bar consist of NdFeB/PDMS composites to construct a magnetic actuator with sensing ability. These results give the flexible three-axial tactile sensor high potential for use in advanced robots, wearable electronics and a variety of human-machine interface implementations.

Keyword :

three-axial sensor piezoelectricity micropillar array P(VDF-TrFE) microstructure-enhanced

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GB/T 7714 Chen, Xiaoliang , Shao, Jinyou , Tian, Hongmiao et al. Flexible three-axial tactile sensors with microstructure-enhanced piezoelectric effect and specially-arranged piezoelectric arrays [J]. | SMART MATERIALS AND STRUCTURES , 2018 , 27 (2) .
MLA Chen, Xiaoliang et al. "Flexible three-axial tactile sensors with microstructure-enhanced piezoelectric effect and specially-arranged piezoelectric arrays" . | SMART MATERIALS AND STRUCTURES 27 . 2 (2018) .
APA Chen, Xiaoliang , Shao, Jinyou , Tian, Hongmiao , Li, Xiangming , Tian, Yazhou , Wang, Chao . Flexible three-axial tactile sensors with microstructure-enhanced piezoelectric effect and specially-arranged piezoelectric arrays . | SMART MATERIALS AND STRUCTURES , 2018 , 27 (2) .
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Batch fabrication of nanogap electrodes arrays with controllable cracking for hydrogen sensing EI SCIE Scopus
期刊论文 | 2018 , 270 , 475-481 | SENSORS AND ACTUATORS B-CHEMICAL
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Abstract :

Hydrogen sensor based on Pd nanogap arrays was fabricated using the swelling induced cracking method. The square hole Pd array is patterned on the polymer to define the position of the nanogaps. We discuss the influence of the size and the shape of the holes on the formed nanogaps. The structural and morphological characteristics of the metal array and the nanogaps were investigated using laser scanning confocal microscopy (LSCM) and scanning electron microscopy (SEM). To illustrate an application of the nanogap structure, the Pd nanogap array was deposited on epoxy and polyimide (PI) substrate and used as H-2 sensor, showing a good sensitivity and stability at room temperature. Moreover, the performance of the nanogap array on PI substrate remains stable after annealing at 80-180 degrees C. This effect is attributed to the high thermal stability of the PI substrate. The effective fabrication method, good sensitivity and the high stability of the Pd nanogap arrays show promising application for H-2 sensing.

Keyword :

Swelling Hydrogen sensors Nanogap arrays Epoxy Polyimide Palladium

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GB/T 7714 Zhao, Qiang , Shao, Jinyou , Tian, Hongmiao et al. Batch fabrication of nanogap electrodes arrays with controllable cracking for hydrogen sensing [J]. | SENSORS AND ACTUATORS B-CHEMICAL , 2018 , 270 : 475-481 .
MLA Zhao, Qiang et al. "Batch fabrication of nanogap electrodes arrays with controllable cracking for hydrogen sensing" . | SENSORS AND ACTUATORS B-CHEMICAL 270 (2018) : 475-481 .
APA Zhao, Qiang , Shao, Jinyou , Tian, Hongmiao , Li, Xiangming , Wang, Chunhui , Liu, Jiawei . Batch fabrication of nanogap electrodes arrays with controllable cracking for hydrogen sensing . | SENSORS AND ACTUATORS B-CHEMICAL , 2018 , 270 , 475-481 .
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A Stretchable and Transparent Nanocomposite Nanogenerator for Self-Powered Physiological Monitoring EI SCIE PubMed Scopus
期刊论文 | 2017 , 9 (48) , 42200-42209 | ACS APPLIED MATERIALS & INTERFACES | IF: 8.097
WoS CC Cited Count: 3
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Abstract :

Smart sensing electronic devices with good transparency, high stretchability, and self-powered sensing characteristics are essential in wearable health monitoring systems. This paper innovatively proposes a stretchable nanocomposite nanogenerator with good transparency that can be conformally attached to the human body to harvest biomechanical energy and monitor physiological signals. The work reports an innovative device that uses sprayed silver nanowires as transparent electrodes and sandwiches a nanocomposite of piezoelectric BaTiO3 and polydimethylsiloxane as the sensing layer, which exhibits good transparency and mechanical transformability with stretchable, foldable, and twistable properties. The highly flexible nanogenerator affords a good input output linearity under the vertical force and the sensing ability to detect lateral stretching deformation up to 60% strain under piezoelectric mechanisms. Furthermore, the proposed device can effectively harvest touch energies from the human body as a single-electrode triboelectric nanogenerator. Under periodic contact and separation, a maximum output voltage of 105 V, a current density of 6.5 mu A/cm(2), and a power density of 102 mu W/cm(2) can be achieved, exhibiting a good power generation performance. Owing to the high conformability and excellent sensitivity of the nanogenerator, it can also act as a self-powered wearable sensor attached to different parts of the human body for real-time monitoring of the human physiological signals such as eye blinking, pronunciation, arm movement, and radial artery pulse. The designed nanocomposite nanogenerator shows great potential for use in self-powered e-skins and healthcare monitoring systems.

Keyword :

piezoelectric nanocomposite physiological monitoring self-powered stretchable strain sensor triboelectric transparent

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GB/T 7714 Chen, Xiaoliang , Parida, Kaushik , Wang, Jiangxin et al. A Stretchable and Transparent Nanocomposite Nanogenerator for Self-Powered Physiological Monitoring [J]. | ACS APPLIED MATERIALS & INTERFACES , 2017 , 9 (48) : 42200-42209 .
MLA Chen, Xiaoliang et al. "A Stretchable and Transparent Nanocomposite Nanogenerator for Self-Powered Physiological Monitoring" . | ACS APPLIED MATERIALS & INTERFACES 9 . 48 (2017) : 42200-42209 .
APA Chen, Xiaoliang , Parida, Kaushik , Wang, Jiangxin , Xiong, Jiaqing , Lin, Meng-Fang , Shao, Jinyou et al. A Stretchable and Transparent Nanocomposite Nanogenerator for Self-Powered Physiological Monitoring . | ACS APPLIED MATERIALS & INTERFACES , 2017 , 9 (48) , 42200-42209 .
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Flexible and Transparent Strain Sensors with Embedded Multiwalled Carbon Nanotubes Meshes EI SCIE PubMed Scopus
期刊论文 | 2017 , 9 (46) , 40681-40689 | ACS APPLIED MATERIALS & INTERFACES | IF: 8.097
WoS CC Cited Count: 9
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Abstract :

Strain sensors combining high sensitivity with good transparency and flexibility would be of great usefulness in smart wearable/flexible electronics. However, the fabrication of such strain sensors is still challenging. In this study, new strain sensors with embedded multiwalled carbon nanotubes (MWCNTs) meshes in polydimethylsiloxane (PDMS) films were designed and tested. The strain sensors showed elevated optical transparency of up to 87% and high sensitivity with a gauge factor of 1140 at a small strain of 8.75%. The gauge factors of the sensors were also found relatively stable since they did not obviously change after 2000 stretching/releasing cycles. The sensors were tested to detect motion in the human body, such as wrist bending, eye blinking, mouth phonation, and pulse, and the results were shown to be satisfactory. Furthermore, the fabrication of the strain sensor consisting of mechanically blading MWCNTs aqueous dispersions into microtrenches of prestructured PDMS films was straightforward, was low cost, and resulted in high yield. All these features testify to the great potential of these sensors in future real applications.

Keyword :

transparent sensors embedded multiwalled carbon nanotubes meshes high stability strain sensors high sensitivity

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GB/T 7714 Nie, Bangbang , Li, Xiangming , Shao, Jinyou et al. Flexible and Transparent Strain Sensors with Embedded Multiwalled Carbon Nanotubes Meshes [J]. | ACS APPLIED MATERIALS & INTERFACES , 2017 , 9 (46) : 40681-40689 .
MLA Nie, Bangbang et al. "Flexible and Transparent Strain Sensors with Embedded Multiwalled Carbon Nanotubes Meshes" . | ACS APPLIED MATERIALS & INTERFACES 9 . 46 (2017) : 40681-40689 .
APA Nie, Bangbang , Li, Xiangming , Shao, Jinyou , Li, Xin , Tian, Hongmiao , Wang, Duorui et al. Flexible and Transparent Strain Sensors with Embedded Multiwalled Carbon Nanotubes Meshes . | ACS APPLIED MATERIALS & INTERFACES , 2017 , 9 (46) , 40681-40689 .
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Friction Contribution to Bioinspired Mushroom-Shaped Dry Adhesives SCIE Scopus
期刊论文 | 2017 , 4 (9) | ADVANCED MATERIALS INTERFACES | IF: 4.834
WoS CC Cited Count: 1
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Abstract :

Bioinspired mushroom-shaped micropillar recently has attracted considerable interest from researchers on adhesion-functionalized artificial surface due to its prominent dry adhesive property. Understanding the interface behavior and further exploring the physical mechanism are of significance for properly designing the structure dimension with enhanced performance. However, the friction contribution to such type of adhesive structures is mostly overlooked in previous investigations. In this paper, by revisiting the detachment behavior associated with the calculation of the critical dynamic crack size making the contact interface destabilized, it is demonstrated that the friction force does work in the detachment process of mushroom-shaped micropillars. The calculated maximum pull-off forces are in good agreement with experimental results and the friction force contribution can reach up to about 41% of the total adhesive force when the tip diameter is 2.6 times the diameter of the supporting pillar. The present model provides a deeper insight into the mushroom-shaped dry adhesives and may be helpful in future bioinspired dry adhesives designs.

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GB/T 7714 Hu, Hong , Tian, Hongmiao , Shao, Jinyou et al. Friction Contribution to Bioinspired Mushroom-Shaped Dry Adhesives [J]. | ADVANCED MATERIALS INTERFACES , 2017 , 4 (9) .
MLA Hu, Hong et al. "Friction Contribution to Bioinspired Mushroom-Shaped Dry Adhesives" . | ADVANCED MATERIALS INTERFACES 4 . 9 (2017) .
APA Hu, Hong , Tian, Hongmiao , Shao, Jinyou , Wang, Yue , Li, Xiangming , Tian, Yu et al. Friction Contribution to Bioinspired Mushroom-Shaped Dry Adhesives . | ADVANCED MATERIALS INTERFACES , 2017 , 4 (9) .
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Discretely Supported Dry Adhesive Film Inspired by Biological Bending Behavior for Enhanced Performance on a Rough Surface EI SCIE PubMed Scopus
期刊论文 | 2017 , 9 (8) , 7752-7760 | ACS APPLIED MATERIALS & INTERFACES | IF: 8.097
WoS CC Cited Count: 6
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Abstract :

Biologically inspired dry adhesion has recently become a research hot topic because of its practical significance in scientific research and instrumental technology. Yet, most of the current studies merely focus on borrowing the concept from some finer biological contact elements but lose sight of the foundation ones that play an equally important role in the adhesion functionality. Inspired by the bending behavior of the flexible foundation element of a gecko (lamellar skin) in attachment motion, in this study, a new type of dry adhesive structure was proposed, wherein a mushroom-shaped micropillar array behaving as a strongly adhesive layer was engineered on a discretely supported thin film. We experimentally observed and analytically modeled the structural deformation and found that the energy penalty could be largely reduced because of the partial shift from pillar bending to film bending. Such behavior is very analogous in functionality to the lamellar skin in a gecko's pads and is helpful in effectively limiting the damage of the contact interface, thus generating enhanced adhesion even on a rough surface.

Keyword :

dry adhesive film energy penalty biological foundation element bending behavior mushroom-shaped micropillar rough surface

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GB/T 7714 Hu, Hong , Tian, Hongmiao , Shao, Jinyou et al. Discretely Supported Dry Adhesive Film Inspired by Biological Bending Behavior for Enhanced Performance on a Rough Surface [J]. | ACS APPLIED MATERIALS & INTERFACES , 2017 , 9 (8) : 7752-7760 .
MLA Hu, Hong et al. "Discretely Supported Dry Adhesive Film Inspired by Biological Bending Behavior for Enhanced Performance on a Rough Surface" . | ACS APPLIED MATERIALS & INTERFACES 9 . 8 (2017) : 7752-7760 .
APA Hu, Hong , Tian, Hongmiao , Shao, Jinyou , Li, Xiangming , Wang, Yue , Wang, Yan et al. Discretely Supported Dry Adhesive Film Inspired by Biological Bending Behavior for Enhanced Performance on a Rough Surface . | ACS APPLIED MATERIALS & INTERFACES , 2017 , 9 (8) , 7752-7760 .
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High-Performance Piezoelectric Nanogenerators with Imprinted P(VDF-TrFE)/BaTiO3 Nanocomposite Micropillars for Self-Powered Flexible Sensors EI SCIE PubMed Scopus
期刊论文 | 2017 , 13 (23) | SMALL | IF: 9.598
WoS CC Cited Count: 30 SCOPUS Cited Count: 30
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Abstract :

Piezoelectric nanogenerators with large output, high sensitivity, and good flexibility have attracted extensive interest in wearable electronics and personal healthcare. In this paper, the authors propose a high-performance flexible piezoelectric nanogenerator based on piezoelectrically enhanced nanocomposite micropillar array of polyvinylidene fluoride-trifluoroethylene (P(VDF-TrFE))/barium titanate (BaTiO3) for energy harvesting and highly sensitive self-powered sensing. By a reliable and scalable nanoimprinting process, the piezoelectrically enhanced vertically aligned P(VDF-TrFE)/BaTiO3 nanocomposite micropillar arrays are fabricated. The piezoelectric device exhibits enhanced voltage of 13.2 V and a current density of 0.33 mu A cm(-2), which an enhancement by a factor of 7.3 relatives to the pristine P(VDF-TrFE) bulk film. The mechanisms of high performance are mainly attributed to the enhanced piezoelectricity of the P(VDF-TrFE)/BaTiO3 nanocomposite materials and the improved mechanical flexibility of the micropillar array. Under mechanical impact, stable electricity is stably generated from the nanogenerator and used to drive various electronic devices to work continuously, implying its significance in the field of consumer electronic devices. Furthermore, it can be applied as self-powered flexible sensor work in a noncontact mode for detecting air pressure and wearable sensors for detecting some human vital signs including different modes of breath and heartbeat pulse, which shows its potential applications in flexible electronics and medical sciences.

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GB/T 7714 Chen, Xiaoliang , Li, Xiangming , Shao, Jinyou et al. High-Performance Piezoelectric Nanogenerators with Imprinted P(VDF-TrFE)/BaTiO3 Nanocomposite Micropillars for Self-Powered Flexible Sensors [J]. | SMALL , 2017 , 13 (23) .
MLA Chen, Xiaoliang et al. "High-Performance Piezoelectric Nanogenerators with Imprinted P(VDF-TrFE)/BaTiO3 Nanocomposite Micropillars for Self-Powered Flexible Sensors" . | SMALL 13 . 23 (2017) .
APA Chen, Xiaoliang , Li, Xiangming , Shao, Jinyou , An, Ningli , Tian, Hongmiao , Wang, Chao et al. High-Performance Piezoelectric Nanogenerators with Imprinted P(VDF-TrFE)/BaTiO3 Nanocomposite Micropillars for Self-Powered Flexible Sensors . | SMALL , 2017 , 13 (23) .
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On utilizing alternating current-flow field effect transistor for flexibly manipulating particles in microfluidics and nanofluidics EI CPCI-S SCIE PubMed Scopus
会议论文 | 2016 , 10 (3) | Annual Meeting of the AES-Electrophoresis-Society | IF: 2.535
WoS CC Cited Count: 17
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Abstract :

By imposing a biased gate voltage to a center metal strip, arbitrary symmetry breaking in induced-charge electroosmotic flow occurs on the surface of this planar gate electrode, a phenomenon termed as AC-flow field effect transistor (AC-FFET). In this work, the potential of AC-FFET with a shiftable flow stagnation line to flexibly manipulate micro-nano particle samples in both a static and continuous flow condition is demonstrated via theoretical analysis and experimental validation. The effect of finite Debye length of induced double-layer and applied field frequency on the manipulating flexibility factor for static condition is investigated, which indicates AC-FFET turns out to be more effective for achieving a position-controllable concentrating of target nano-particle samples in nanofluidics compared to the previous trial in microfluidics. Besides, a continuous microfluidics-based particle concentrator/director is developed to deal with incoming analytes in dynamic condition, which exploits a design of tandem electrode configuration to consecutively flow focus and divert incoming particle samples to a desired downstream branch channel, as prerequisite for a following biochemical analysis. Our physical demonstrations with AC-FFET prove valuable for innovative designs of flexible electrokinetic frameworks, which can be conveniently integrated with other microfluidic or nanofluidic components into a complete lab-on-chip diagnostic platform due to a simple electrode structure. Published by AIP Publishing.

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GB/T 7714 Liu, Weiyu , Shao, Jinyou , Ren, Yukun et al. On utilizing alternating current-flow field effect transistor for flexibly manipulating particles in microfluidics and nanofluidics [C] . 2016 .
MLA Liu, Weiyu et al. "On utilizing alternating current-flow field effect transistor for flexibly manipulating particles in microfluidics and nanofluidics" . (2016) .
APA Liu, Weiyu , Shao, Jinyou , Ren, Yukun , Liu, Jiangwei , Tao, Ye , Jiang, Hongyuan et al. On utilizing alternating current-flow field effect transistor for flexibly manipulating particles in microfluidics and nanofluidics . (2016) .
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Mushroom-Shaped Micropillars for Robust Nonwetting Surface by Electrohydrodynamic Structuring Technique EI SCIE Scopus
期刊论文 | 2016 , 15 (2) , 237-242 | IEEE TRANSACTIONS ON NANOTECHNOLOGY | IF: 2.485
WoS CC Cited Count: 2
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Abstract :

Mushroom-shaped micropillars (MSMPs) have a unique microscopic shape that is suitable to produce a highly robust nonwetting surface. This commercially important property is possible thanks to the specific overhang shape, which has a larger tip diameter than the shaft below. We fabricated such a textured surface using poly(methyl methacrylate) (PMMA) via electro-hydrodynamic structuring technique. The method combines hot embossing, electrically induced growth, and electrowetting. Even though PMMA itself is hydrophilic (the intrinsic contact angle is 82 degrees), its modified surface is hydrophobic with an apparent contact angle of 152 degrees. We also studied the robustness of the nonwetting surface by comparing the difference between the static contact angles before and after the samples had been submerged in water. Our results show that only the surface structured with the 43-mu m tip-diameter MSMPs (the largest size) can successfully maintain its highly nonwetting property. Because of the large fabrication potential of the MSMPs with a large tip diameter, the described surface structuring technique is a promising candidate for the mass production of artificial and sufficiently robust nonwetting surfaces.

Keyword :

robustness mushroom-shaped hydrophobic Electrohydrodynamic micropillars

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GB/T 7714 Hu, Hong , Shao, Jinyou , Tian, Hongmiao et al. Mushroom-Shaped Micropillars for Robust Nonwetting Surface by Electrohydrodynamic Structuring Technique [J]. | IEEE TRANSACTIONS ON NANOTECHNOLOGY , 2016 , 15 (2) : 237-242 .
MLA Hu, Hong et al. "Mushroom-Shaped Micropillars for Robust Nonwetting Surface by Electrohydrodynamic Structuring Technique" . | IEEE TRANSACTIONS ON NANOTECHNOLOGY 15 . 2 (2016) : 237-242 .
APA Hu, Hong , Shao, Jinyou , Tian, Hongmiao , Li, Xiangming , Jiang, Chengbao . Mushroom-Shaped Micropillars for Robust Nonwetting Surface by Electrohydrodynamic Structuring Technique . | IEEE TRANSACTIONS ON NANOTECHNOLOGY , 2016 , 15 (2) , 237-242 .
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Nanoscale Electrodes for Flexible Electronics by Swelling Controlled Cracking EI SCIE PubMed Scopus
期刊论文 | 2016 , 28 (30) , 6337-+ | ADVANCED MATERIALS | IF: 19.791
WoS CC Cited Count: 11
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Nanogap electrodes are realized using pre-patterned electrodes and a swelling controlled cracking method. Parallel fabrication of nanogap electrodes on flexible substrates can be achieved using this method. This swelling-controlled cracking method is promising for fabricating high-performance flexible electronics. UV photo detectors with ZnO nanoparticle-bridged nanogap electrodes exhibit high responsivity and external quantum efficiency.

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GB/T 7714 Zhao, Qiang , Wang, Wenjun , Shao, Jinyou et al. Nanoscale Electrodes for Flexible Electronics by Swelling Controlled Cracking [J]. | ADVANCED MATERIALS , 2016 , 28 (30) : 6337-+ .
MLA Zhao, Qiang et al. "Nanoscale Electrodes for Flexible Electronics by Swelling Controlled Cracking" . | ADVANCED MATERIALS 28 . 30 (2016) : 6337-+ .
APA Zhao, Qiang , Wang, Wenjun , Shao, Jinyou , Li, Xiangming , Tian, Hongmiao , Liu, Lu et al. Nanoscale Electrodes for Flexible Electronics by Swelling Controlled Cracking . | ADVANCED MATERIALS , 2016 , 28 (30) , 6337-+ .
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