Highly active two-dimensional(2D)nanocomposites,integrating the unique merits of individual components and synergistic effects of composites,are greatly desired for flexible sensing device applications.Although 2D tra...Highly active two-dimensional(2D)nanocomposites,integrating the unique merits of individual components and synergistic effects of composites,are greatly desired for flexible sensing device applications.Although 2D transition metal carbides and nitrides(MXenes)combined with their high metallic conductivity and versatile surface chemistry have shown its huge potential for sensing reactions,it still remains a major challenge to construct functional materials with intriguing sensing performance at room temperature(RT).Herein,we used an integration of density functional theory(DFT)simulations and bulk electrosensitive measurements to show high electrocatalytic sensitivity of polyaniline/MXene(PANI/Ti3C2Tx)nanocomposites.Thanks to the synergistic properties of nanocomposites and high catalytic/absorption capacity of Ti3C2Tx MXene,PANI nanoparticles are rationally decorated on Ti3C2Tx nanosheet surface via in situ polymerization by low temperature approach to induce remarkable detection sensitivity,rapid response/recovery rate,and mechanical stability at RT.This study offers a versatile platform to use MXenes to fabricate 2D nanocomposites materials for high-performance flexible gas sensors.展开更多
With the rapid development of the Internet of Things,there is a great demand for portable gas sensors.Metal oxide semiconductors(MOS)are one of the most traditional and well-studied gas sensing materials and have been...With the rapid development of the Internet of Things,there is a great demand for portable gas sensors.Metal oxide semiconductors(MOS)are one of the most traditional and well-studied gas sensing materials and have been widely used to prepare various commercial gas sensors.However,it is limited by high operating temperature.The current research works are directed towards fabricating high-performance flexible room-temperature(FRT)gas sensors,which are effective in simplifying the structure of MOS-based sensors,reducing power consumption,and expanding the application of portable devices.This article presents the recent research progress of MOS-based FRT gas sensors in terms of sensing mechanism,performance,flexibility characteristics,and applications.This review comprehensively summarizes and discusses five types of MOS-based FRT gas sensors,including pristine MOS,noble metal nanoparticles modified MOS,organic polymers modified MOS,carbon-based materials(carbon nanotubes and graphene derivatives)modified MOS,and two-dimensional transition metal dichalcogenides materials modified MOS.The effect of light-illuminated to improve gas sensing performance is further discussed.Furthermore,the applications and future perspectives of FRT gas sensors are also discussed.展开更多
Two-dimensional(2D)nanomaterials have demonstrated great potential in the field of flexible gas sensing due to their inherent high specific surface areas,unique electronic properties and flexibility property.However,n...Two-dimensional(2D)nanomaterials have demonstrated great potential in the field of flexible gas sensing due to their inherent high specific surface areas,unique electronic properties and flexibility property.However,numerous challenges including sensitivity,selectivity,response time,recovery time,and stability have to be addressed before their practical application in gas detection field.Development of graphene-like 2D/2D nanocomposites as an efficient strategy to achieve high-performance 2D gas sensor has been reported recently.This review aims to discuss the latest advancements in the 2D/2D nanocomposites for gas sensors.We first elaborate the gas-sensing mechanisms and the collective benefits of 2D/2D hybridization as sensor materials.Then,we systematically present the current gas-sensing applications based on different categories of 2D/2D nanocomposites.Finally,we conclude the future prospect of 2D/2D nanocomposites in gas sensing applications.展开更多
Flexible nitrogen dioxide(NO_2) gas sensors based on organic thin-film transistors(OTFTs) were developed in this work, in which conductive indium tin oxide(ITO) coated polyethylene naphthalene-2,6-dicarboxylate(PEN) w...Flexible nitrogen dioxide(NO_2) gas sensors based on organic thin-film transistors(OTFTs) were developed in this work, in which conductive indium tin oxide(ITO) coated polyethylene naphthalene-2,6-dicarboxylate(PEN) was designed for the flexible substrates, and poly methyl methacrylate(PMMA) and poly(3-hexylthiophene)(P3HT) was spin-coated as the gate dielectric layer and spray-deposited as the active layer, respectively. The effects of PMMA concentrations and P3HT solution volume on performances of flexible OTFTs were systematically investigated. The results showed that the optimized flexible OTFT exhibited high field-effect mobility(9.51×10^(–3) cm^2/(V s) at a gate bias of –50 V) and excellent response characteristics,including high sensitivity(up to 0.169 ppm^(–1)), good repeatability and selectivity. The flexibility of the developed OTFT sensor was also investigated, and the results showed that the electrical and gas-sensing properties were affected by the bending cycles,thus further work should be done for improving the flexibility of the sensor. This work provides an effective approach in developing high performance flexible OTFT NO_2 gas sensor.展开更多
With the rapid development of portable devices and internet of things,the requirement of system wearability and integration accelerates the investigation of flexible multifunctional sensors.In this study,we developed ...With the rapid development of portable devices and internet of things,the requirement of system wearability and integration accelerates the investigation of flexible multifunctional sensors.In this study,we developed an integrated flexible sensing system with four nanowire-based sensors and a Ni microwire-based temperature sensor.The four nanowirebased sensors are three kinds of photodetectors responding to lights with different wavelengths and a gas sensor.Due to the large surface volume ratio and considerable sub wavelength effect,all the nanowire-based sensors show good sensing response and excellent linear relationship between sensitivity and temperature.The as-fabricated flexible sensing system can simultaneously detect environmental parameters,including temperature change,light intensities from UV-Visible to near infrared regions,and harmful gas concentration.Our flexible multifunctional sensing system therefore opens up a new way for the emerging portable and wearable electronics.展开更多
Flexible trimethylamine sensor has been realized based on In2 O3 nanofibers via electrospinning and a deposition technique.The web-like In2O3 nanofibers with high length-to-diameter ratios are benefit for gas adsorpti...Flexible trimethylamine sensor has been realized based on In2 O3 nanofibers via electrospinning and a deposition technique.The web-like In2O3 nanofibers with high length-to-diameter ratios are benefit for gas adsorption and desorption.High trimethylamine sensing properties are observed.The sensors can detect trimethylamine gas down to 1 ppm at 80℃with the response up to 3.8.Additionally,rapid response(6 s)and recovery(10 s)behavior can also be obtained.Good reliability and flexibility are observed in 100 bending/extending cycles.Our results open a new route to construct flexible gas sensors in practice.展开更多
Capable of measuring volatile biomarker produced by the metabolism from several secretion pathways, flexible and stretchable metal oxide gas sensors have received increasing attention and their development for healthc...Capable of measuring volatile biomarker produced by the metabolism from several secretion pathways, flexible and stretchable metal oxide gas sensors have received increasing attention and their development for healthcare starts to gain momentum.Integration of semiconducting metal oxide on a soft, thin, flexible substrate is the key to enable the flexible property to the gas sensor and such integration typically involves either a direct growth or post transfer of the metal oxide on or to the flexible substrate. In addition to the planar plastic substrate, textile represents another important class of flexible substrates due to its ease of integration with clothing. Moreover, the integration of metal oxide on a single fiber provides a great versatility for different applications. Though flexible sensors can easily conform to the developable surface(e.g., cylinder or cone) from a bending deformation, the conformal contact between the sensor and the tissue surface that is often non-developable requires the sensor to be capable of stretching. Due to the intrinsically brittle nature of the semiconducting metal oxide, several stretchable structures have been explored. Despite the great strides made to the burgeoning area of flexible and stretchable metal oxide gas sensors,grand challenges still need to be overcome before the technology can be applied for the practical application. The selected challenges discussed in this mini-review also represent a fraction of possibilities and opportunities for the research community in the future.展开更多
基金support from the National Natural Science Foundation of China(NSFC Grant No.21571080,51502110)the Science and Technology Development Plan of Jilin Province(20190103135JH).
文摘Highly active two-dimensional(2D)nanocomposites,integrating the unique merits of individual components and synergistic effects of composites,are greatly desired for flexible sensing device applications.Although 2D transition metal carbides and nitrides(MXenes)combined with their high metallic conductivity and versatile surface chemistry have shown its huge potential for sensing reactions,it still remains a major challenge to construct functional materials with intriguing sensing performance at room temperature(RT).Herein,we used an integration of density functional theory(DFT)simulations and bulk electrosensitive measurements to show high electrocatalytic sensitivity of polyaniline/MXene(PANI/Ti3C2Tx)nanocomposites.Thanks to the synergistic properties of nanocomposites and high catalytic/absorption capacity of Ti3C2Tx MXene,PANI nanoparticles are rationally decorated on Ti3C2Tx nanosheet surface via in situ polymerization by low temperature approach to induce remarkable detection sensitivity,rapid response/recovery rate,and mechanical stability at RT.This study offers a versatile platform to use MXenes to fabricate 2D nanocomposites materials for high-performance flexible gas sensors.
基金This work is supported by This work was supported by the National Key R&D Program of China(Nos.2020YFB2008604 and 2021YFB3202500)the National Natural Science Foundation of China(Nos.61874034 and 51861135105)+1 种基金the International Science and Technology Cooperation Program of Shanghai Science and Technology Innovation Action Plan(No.21520713300)Fudan University-CIOMP Joint Fund(E02632Y7H0).
文摘With the rapid development of the Internet of Things,there is a great demand for portable gas sensors.Metal oxide semiconductors(MOS)are one of the most traditional and well-studied gas sensing materials and have been widely used to prepare various commercial gas sensors.However,it is limited by high operating temperature.The current research works are directed towards fabricating high-performance flexible room-temperature(FRT)gas sensors,which are effective in simplifying the structure of MOS-based sensors,reducing power consumption,and expanding the application of portable devices.This article presents the recent research progress of MOS-based FRT gas sensors in terms of sensing mechanism,performance,flexibility characteristics,and applications.This review comprehensively summarizes and discusses five types of MOS-based FRT gas sensors,including pristine MOS,noble metal nanoparticles modified MOS,organic polymers modified MOS,carbon-based materials(carbon nanotubes and graphene derivatives)modified MOS,and two-dimensional transition metal dichalcogenides materials modified MOS.The effect of light-illuminated to improve gas sensing performance is further discussed.Furthermore,the applications and future perspectives of FRT gas sensors are also discussed.
基金supported by Zhejiang Provincial Natural Science Foundation of China (No. LY18F010009)Ningbo Natural Science Foundation (No. 2018A610002)
文摘Two-dimensional(2D)nanomaterials have demonstrated great potential in the field of flexible gas sensing due to their inherent high specific surface areas,unique electronic properties and flexibility property.However,numerous challenges including sensitivity,selectivity,response time,recovery time,and stability have to be addressed before their practical application in gas detection field.Development of graphene-like 2D/2D nanocomposites as an efficient strategy to achieve high-performance 2D gas sensor has been reported recently.This review aims to discuss the latest advancements in the 2D/2D nanocomposites for gas sensors.We first elaborate the gas-sensing mechanisms and the collective benefits of 2D/2D hybridization as sensor materials.Then,we systematically present the current gas-sensing applications based on different categories of 2D/2D nanocomposites.Finally,we conclude the future prospect of 2D/2D nanocomposites in gas sensing applications.
基金supported by the Funds for Creative Research Groups of China(Grant No.61421002)the National Natural Science Foundation of China(Grant Nos.61571097 and 61604033)the National Postdoctoral Program for Innovative Talents(Grant No.BX201600026)
文摘Flexible nitrogen dioxide(NO_2) gas sensors based on organic thin-film transistors(OTFTs) were developed in this work, in which conductive indium tin oxide(ITO) coated polyethylene naphthalene-2,6-dicarboxylate(PEN) was designed for the flexible substrates, and poly methyl methacrylate(PMMA) and poly(3-hexylthiophene)(P3HT) was spin-coated as the gate dielectric layer and spray-deposited as the active layer, respectively. The effects of PMMA concentrations and P3HT solution volume on performances of flexible OTFTs were systematically investigated. The results showed that the optimized flexible OTFT exhibited high field-effect mobility(9.51×10^(–3) cm^2/(V s) at a gate bias of –50 V) and excellent response characteristics,including high sensitivity(up to 0.169 ppm^(–1)), good repeatability and selectivity. The flexibility of the developed OTFT sensor was also investigated, and the results showed that the electrical and gas-sensing properties were affected by the bending cycles,thus further work should be done for improving the flexibility of the sensor. This work provides an effective approach in developing high performance flexible OTFT NO_2 gas sensor.
基金supported by the National Natural Science Foundation of China(61874111 and 61625404)the Young Elite Scientists Sponsorship Program by CAST(2018QNRC001)China Postdoctoral Science Foundation(2016M601131)。
文摘With the rapid development of portable devices and internet of things,the requirement of system wearability and integration accelerates the investigation of flexible multifunctional sensors.In this study,we developed an integrated flexible sensing system with four nanowire-based sensors and a Ni microwire-based temperature sensor.The four nanowirebased sensors are three kinds of photodetectors responding to lights with different wavelengths and a gas sensor.Due to the large surface volume ratio and considerable sub wavelength effect,all the nanowire-based sensors show good sensing response and excellent linear relationship between sensitivity and temperature.The as-fabricated flexible sensing system can simultaneously detect environmental parameters,including temperature change,light intensities from UV-Visible to near infrared regions,and harmful gas concentration.Our flexible multifunctional sensing system therefore opens up a new way for the emerging portable and wearable electronics.
基金supported by the National Natural Science Foundation of China(Nos.51808328 and 61903235)Natural Science Foundation of Shandong Province(Nos.ZR2017LEM010 and ZR2019BEM036)。
文摘Flexible trimethylamine sensor has been realized based on In2 O3 nanofibers via electrospinning and a deposition technique.The web-like In2O3 nanofibers with high length-to-diameter ratios are benefit for gas adsorption and desorption.High trimethylamine sensing properties are observed.The sensors can detect trimethylamine gas down to 1 ppm at 80℃with the response up to 3.8.Additionally,rapid response(6 s)and recovery(10 s)behavior can also be obtained.Good reliability and flexibility are observed in 100 bending/extending cycles.Our results open a new route to construct flexible gas sensors in practice.
基金supported by the start-up fund provided by the Engineering Science and Mechanics Department, College of Engineering, and Materials Research Institute at the Pennsylvania State University (PSU)Dorothy Quiggle Career Development Professorship in Engineering and Global Engineering Leadership Program at PSUthe partial support from the National Natural Science Foundation of China (Grant No. 11572161)State Key Laboratory for Strength and Vibration of Mechanical Structures (Grant No. SV2016-KF-17)
文摘Capable of measuring volatile biomarker produced by the metabolism from several secretion pathways, flexible and stretchable metal oxide gas sensors have received increasing attention and their development for healthcare starts to gain momentum.Integration of semiconducting metal oxide on a soft, thin, flexible substrate is the key to enable the flexible property to the gas sensor and such integration typically involves either a direct growth or post transfer of the metal oxide on or to the flexible substrate. In addition to the planar plastic substrate, textile represents another important class of flexible substrates due to its ease of integration with clothing. Moreover, the integration of metal oxide on a single fiber provides a great versatility for different applications. Though flexible sensors can easily conform to the developable surface(e.g., cylinder or cone) from a bending deformation, the conformal contact between the sensor and the tissue surface that is often non-developable requires the sensor to be capable of stretching. Due to the intrinsically brittle nature of the semiconducting metal oxide, several stretchable structures have been explored. Despite the great strides made to the burgeoning area of flexible and stretchable metal oxide gas sensors,grand challenges still need to be overcome before the technology can be applied for the practical application. The selected challenges discussed in this mini-review also represent a fraction of possibilities and opportunities for the research community in the future.
