Graphene has excellent optical and electricproperties,which make it a good candidate fortransparent electrode Moreover,its flexibility isvery good for flexible electronics applications.HereI'd like to introduce th...Graphene has excellent optical and electricproperties,which make it a good candidate fortransparent electrode Moreover,its flexibility isvery good for flexible electronics applications.HereI'd like to introduce the detailed technique of mak-ing flexible graphene touch sensor and displays,and further show its potential application in the flexi-ble devices.展开更多
The surface coverage of two-dimensional(2D)materials has been a challenge,requiring facile growth of conformal 2D materials as well as considerations for transparency,energy level,and interface contact.Self-assembly h...The surface coverage of two-dimensional(2D)materials has been a challenge,requiring facile growth of conformal 2D materials as well as considerations for transparency,energy level,and interface contact.Self-assembly holds promise for addressing this challenge by constructing precisely structured 2D assemblies using intentionally designed building blocks,guided by diverse noncovalent interactions.In this study,we utilize a self-assembled 2D supramolecular organic framework(SOF)to cloak inorganic semiconductors and form composite materials for infrared photodetection.The charged SOF backbone regulates the energy levels,facilitating the migration of electrons at the organic-inorganic interface.Additionally,the oxygen(O)of the ethylene glycol chains forms coordination bonds with the Pb(II)in the inorganic semiconductor,establishing ohmic contacts.The composite device shows excellent detectivity under 500 K blackbody and 1550 nm infrared illumination,achieving D*bb(500 K)of 6.3×109 Jones under 500 K blackbody radiation.Moreover,the device exhibits low noise due to the SOF potential barrier impeding the photogenerated and/or thermally excited holes,and high stability as a result of bonding and passivation of vacancy defects.This study showcases the versatile functionality of 2D SOF materials in the field of optoelectronics,opening doors to innovative advancements in composite devices through a self-assembled organic–inorganic approach.展开更多
A flexible and transparent triboelectric nanogenerator （FT-TENG） has great potential for application in self-powered biosensor systems, electronic skin and wearable electronic devices. However, improving the output ...A flexible and transparent triboelectric nanogenerator （FT-TENG） has great potential for application in self-powered biosensor systems, electronic skin and wearable electronic devices. However, improving the output performance with little damage to its optical properties is challenging. Herein, we have developed an FT-TENG that has a well-ordered nest-like porous polydimethylsiloxane （NP-PDMS） film and graphene transparent electrodes. The NP-PDMS film with ordered pores is fabricated by hydrochloric acid etching of 500 nm sized ZnO spheres made of aggregated nanoparticles, having a light transmittance of 81.8% and a water contact angle of 118.62°. The FT-TENG based on the NP-PDMS film with a porosity of 12%, gives a maximum output of 271 V and 7.8 μA, which are respectively, 3.7 and 2.1-fold of those of a TENG with a flat PDMS film. The peak output power reaches 0.39 mW with a load resistance of 9.01 MΩ. The dielectric constant and effective thickness of the NP-PDMS film and the capacitance and charge transfer of the FT-TENG are systematically investigated. This work provides a novel and effective method to enhance the performance of FT-TENGs with little damage to their optical properties.展开更多
文摘Graphene has excellent optical and electricproperties,which make it a good candidate fortransparent electrode Moreover,its flexibility isvery good for flexible electronics applications.HereI'd like to introduce the detailed technique of mak-ing flexible graphene touch sensor and displays,and further show its potential application in the flexi-ble devices.
基金National Natural Science Foundation of China,Grant/Award Number:22071238National Key R&D Program of China,Grant/Award Number:2017YFE0131900Natural Science Foundation of Chongqing,Grant/Award Numbers:cstc2019jcyjjqX0017,cstc2021ycjh-bgzxm0093。
文摘The surface coverage of two-dimensional(2D)materials has been a challenge,requiring facile growth of conformal 2D materials as well as considerations for transparency,energy level,and interface contact.Self-assembly holds promise for addressing this challenge by constructing precisely structured 2D assemblies using intentionally designed building blocks,guided by diverse noncovalent interactions.In this study,we utilize a self-assembled 2D supramolecular organic framework(SOF)to cloak inorganic semiconductors and form composite materials for infrared photodetection.The charged SOF backbone regulates the energy levels,facilitating the migration of electrons at the organic-inorganic interface.Additionally,the oxygen(O)of the ethylene glycol chains forms coordination bonds with the Pb(II)in the inorganic semiconductor,establishing ohmic contacts.The composite device shows excellent detectivity under 500 K blackbody and 1550 nm infrared illumination,achieving D*bb(500 K)of 6.3×109 Jones under 500 K blackbody radiation.Moreover,the device exhibits low noise due to the SOF potential barrier impeding the photogenerated and/or thermally excited holes,and high stability as a result of bonding and passivation of vacancy defects.This study showcases the versatile functionality of 2D SOF materials in the field of optoelectronics,opening doors to innovative advancements in composite devices through a self-assembled organic–inorganic approach.
基金This work is supported by the National Natural Science Foundation of China （No. 51572040）, the National High-tech R＆D Program of China （No. 2015AA034801） and the large-scale equipment sharing fund of Chongqing University.
文摘A flexible and transparent triboelectric nanogenerator （FT-TENG） has great potential for application in self-powered biosensor systems, electronic skin and wearable electronic devices. However, improving the output performance with little damage to its optical properties is challenging. Herein, we have developed an FT-TENG that has a well-ordered nest-like porous polydimethylsiloxane （NP-PDMS） film and graphene transparent electrodes. The NP-PDMS film with ordered pores is fabricated by hydrochloric acid etching of 500 nm sized ZnO spheres made of aggregated nanoparticles, having a light transmittance of 81.8% and a water contact angle of 118.62°. The FT-TENG based on the NP-PDMS film with a porosity of 12%, gives a maximum output of 271 V and 7.8 μA, which are respectively, 3.7 and 2.1-fold of those of a TENG with a flat PDMS film. The peak output power reaches 0.39 mW with a load resistance of 9.01 MΩ. The dielectric constant and effective thickness of the NP-PDMS film and the capacitance and charge transfer of the FT-TENG are systematically investigated. This work provides a novel and effective method to enhance the performance of FT-TENGs with little damage to their optical properties.
