Achieving a high sensitivity for practical applications has always been one of the main developmental directions for wearable flexible pressure sensors.This paper introduces a laser speckle grayscale lithography syste...Achieving a high sensitivity for practical applications has always been one of the main developmental directions for wearable flexible pressure sensors.This paper introduces a laser speckle grayscale lithography system and a novel method for fabricating random conical array microstructures using grainy laser speckle patterns.Its feasibility is attributed to the autocorrelation function of the laser speckle intensity,which adheres to a first-order Bessel function of the first kind.Through objective speckle size and exposure dose manipulations,we developed a microstructured photoresist with various micromorphologies.These microstructures were used to form polydimethylsiloxane microstructured electrodes that were used in flexible capacitive pressure sensors.These-1 sensors exhibited an ultra-high sensitivity:19.76 kPa for the low-pressure range of 0-100 Pa.Their minimum detection threshold was 1.9 Pa,and they maintained stability and resilience over 10,000 test cycles.These sensors proved to be adept at capturing physiological signals and providing tactile feedback,thereby emphasizing their practical value.展开更多
Recently,graphene-based materials have been successfully fabricated by the electrophoretic deposition(EPD)technique and exhibited various extraordinary properties.Here,research progress of the field of graphene-based ...Recently,graphene-based materials have been successfully fabricated by the electrophoretic deposition(EPD)technique and exhibited various extraordinary properties.Here,research progress of the field of graphene-based materials prepared by the EPD process in recent 5 years is reviewed,including graphene films,graphene/non-metal composites,graphene/metal-based nanoparticles composites,graphene/polymer composites.We also summarize the experimental deposition conditions and the applications of the deposited graphene-based materials that have been reported.It can be concluded that EPD is a simple and reliable manipulation technique and promises a bright future for the production of graphenebased materials in the field of advanced nanocomposite materials.Finally the current issues and outlook of the development direction of EPD in future are also proposed.展开更多
Traditional metal oxide semiconductor(MOS)gas sensors have limited applications in wearable devices owing to their inflexibility and high-power consumption by substantial heat loss.To overcome these limitations,we pre...Traditional metal oxide semiconductor(MOS)gas sensors have limited applications in wearable devices owing to their inflexibility and high-power consumption by substantial heat loss.To overcome these limitations,we prepared doped Si/SiO_(2)flexible fibers by a thermal drawing method as substrates to fabricate MOS gas sensors.A methane(CH_(4))gas sensor was demonstrated by subsequently in situ synthesizing Co-doped ZnO nanorods on the fiber surface.The doped Si core acted as the heating source through Joule heating,which conducted heat to the sensing material with reduced heat loss;the SiO_(2)cladding was an insulating substrate.The gas sensor was integrated into a miner cloth as a wearable device,and the concentration change of CH_(4)was monitored in real time through different colored lightemitting diodes.Our study demonstrated the feasibility of using doped Si/SiO_(2)fibers as the substrates to fabricate wearable MOS gas sensors,where the sensors have substantial advantages over tradition sensors in flexibility,heat utilization,etc.展开更多
Glutathione(GSH)is an important biological thiol in cells,which is involved in many physiological processes in the organism and regulates pathological processes of cells.Rapid and accurate monitoring of GSH in vitro a...Glutathione(GSH)is an important biological thiol in cells,which is involved in many physiological processes in the organism and regulates pathological processes of cells.Rapid and accurate monitoring of GSH in vitro and in vivo is quite needed in investigating important biochemical events.In this contribution,innovative cerium(Ce)doped polyaniline(Ce–Fe@PANI NPs)were prepared via Fe(III)induced oxidization polymerization method.Upon addition of GSH,the absorption of Ce–Fe@PANI NPs red shifted from the visible to the NIR region,con-firming the excellent absorption response to GSH.Moreover,Ce–Fe@PANI NPs exhibited excellent photoacoustic(PA)imaging enhancement in tube and shifted the PA intensity peak from 680 nm to 820 nm upon addition of GSH.In vitro and in vivo experiment verified that Ce–Fe@PANI NPs can monitor GSH in deep tissues via PA imaging technology.Collectively,this research provides Ce–Fe@PANI NPs would serve as a powerful nano-platform to realize PA imaging detection of GSH in vitro and in vivo.展开更多
基金supported by the Key Research and Development Program of Shanxi Province(202102030201002)the Changjiang Scholars and Innovative Research Team at the University of Ministry of Education of China(IRT_17R70)+2 种基金the State Key Program of National Natural Science of China(11434007)the 111 Project(D18001)the Fund for Shanxi“1331 Project”Key Subjects Construction.
文摘Achieving a high sensitivity for practical applications has always been one of the main developmental directions for wearable flexible pressure sensors.This paper introduces a laser speckle grayscale lithography system and a novel method for fabricating random conical array microstructures using grainy laser speckle patterns.Its feasibility is attributed to the autocorrelation function of the laser speckle intensity,which adheres to a first-order Bessel function of the first kind.Through objective speckle size and exposure dose manipulations,we developed a microstructured photoresist with various micromorphologies.These microstructures were used to form polydimethylsiloxane microstructured electrodes that were used in flexible capacitive pressure sensors.These-1 sensors exhibited an ultra-high sensitivity:19.76 kPa for the low-pressure range of 0-100 Pa.Their minimum detection threshold was 1.9 Pa,and they maintained stability and resilience over 10,000 test cycles.These sensors proved to be adept at capturing physiological signals and providing tactile feedback,thereby emphasizing their practical value.
文摘Recently,graphene-based materials have been successfully fabricated by the electrophoretic deposition(EPD)technique and exhibited various extraordinary properties.Here,research progress of the field of graphene-based materials prepared by the EPD process in recent 5 years is reviewed,including graphene films,graphene/non-metal composites,graphene/metal-based nanoparticles composites,graphene/polymer composites.We also summarize the experimental deposition conditions and the applications of the deposited graphene-based materials that have been reported.It can be concluded that EPD is a simple and reliable manipulation technique and promises a bright future for the production of graphenebased materials in the field of advanced nanocomposite materials.Finally the current issues and outlook of the development direction of EPD in future are also proposed.
基金This work was supported by the Key Research and Development Program of Shanxi Province(202102030201002)the Changjiang Scholars and Innovative Research Team in University of Ministry of Education of China(IRT_17R70)+2 种基金the State Key Program of National Natural Science of China(11434007)the 111 Project(D18001)the Fund for Shanxi“1331 Project”Key Subjects Construction.
文摘Traditional metal oxide semiconductor(MOS)gas sensors have limited applications in wearable devices owing to their inflexibility and high-power consumption by substantial heat loss.To overcome these limitations,we prepared doped Si/SiO_(2)flexible fibers by a thermal drawing method as substrates to fabricate MOS gas sensors.A methane(CH_(4))gas sensor was demonstrated by subsequently in situ synthesizing Co-doped ZnO nanorods on the fiber surface.The doped Si core acted as the heating source through Joule heating,which conducted heat to the sensing material with reduced heat loss;the SiO_(2)cladding was an insulating substrate.The gas sensor was integrated into a miner cloth as a wearable device,and the concentration change of CH_(4)was monitored in real time through different colored lightemitting diodes.Our study demonstrated the feasibility of using doped Si/SiO_(2)fibers as the substrates to fabricate wearable MOS gas sensors,where the sensors have substantial advantages over tradition sensors in flexibility,heat utilization,etc.
基金This research was funded by National Key Research and Develop-ment Program of China(2018YFA0108700,2017YFA0105602)NSFC Projects of International Cooperation and Exchanges(81720108004)+3 种基金National Natural Science Foundation of China(81974019,81671749)The Research Team Project of Natural Science Foundation of Guangdong Province of China(2017A030312007)The key program of Guangzhou science research plan(201904020047)The Special Project of Dengfeng Program of Guangdong Provincial People’s Hospital(DFJH201812,KJ012019119,KJ012019423).
文摘Glutathione(GSH)is an important biological thiol in cells,which is involved in many physiological processes in the organism and regulates pathological processes of cells.Rapid and accurate monitoring of GSH in vitro and in vivo is quite needed in investigating important biochemical events.In this contribution,innovative cerium(Ce)doped polyaniline(Ce–Fe@PANI NPs)were prepared via Fe(III)induced oxidization polymerization method.Upon addition of GSH,the absorption of Ce–Fe@PANI NPs red shifted from the visible to the NIR region,con-firming the excellent absorption response to GSH.Moreover,Ce–Fe@PANI NPs exhibited excellent photoacoustic(PA)imaging enhancement in tube and shifted the PA intensity peak from 680 nm to 820 nm upon addition of GSH.In vitro and in vivo experiment verified that Ce–Fe@PANI NPs can monitor GSH in deep tissues via PA imaging technology.Collectively,this research provides Ce–Fe@PANI NPs would serve as a powerful nano-platform to realize PA imaging detection of GSH in vitro and in vivo.
