Journal ArticleDOI
Adsorption and desorption of oxygen probed from ZnO nanowire films by photocurrent measurements
TLDR
In this paper, the authors investigated the sensing mechanisms of ZnO nanowire films by performing transient photocurrent measurements and found that the current jumps upon ultraviolet or green laser illumination.Abstract:
Sensing mechanisms of ZnO nanowire films are investigated by performing transient photocurrent measurements. The current jumps upon ultraviolet or green laser illumination. The amplitude in the jump is strongly dependent on the ambient atmosphere. The decay rate is much more sensitive to the ambient atmosphere than the rise rate. The fast rise is due to rapid photogenerated carriers and the slow decay is controlled by slow surface process. Our experimental results indicate that the oxygen physisorption rate is slower than the chemisorption rate.read more
Citations
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Journal ArticleDOI
Solution-processed ultraviolet photodetectors based on colloidal ZnO nanoparticles.
TL;DR: The photocurrent of the device is associated with a light-induced desorption of oxygen from the nanoparticle surfaces, thus removing electron traps and increasing the free carrier density which in turn reduces the Schottky barrier between contacts and ZnO nanoparticles for electron injection.
Journal ArticleDOI
Bio-Integrated Wearable Systems: A Comprehensive Review
Tyler R. Ray,Jungil Choi,Amay J. Bandodkar,Siddharth Krishnan,Philipp Gutruf,Limei Tian,Roozbeh Ghaffari,John A. Rogers +7 more
TL;DR: This review summarizes the latest advances in this emerging field of "bio-integrated" technologies in a comprehensive manner that connects fundamental developments in chemistry, material science, and engineering with sensing technologies that have the potential for widespread deployment and societal benefit in human health care.
Journal ArticleDOI
Gigantic enhancement in response and reset time of ZnO UV nanosensor by utilizing Schottky contact and surface functionalization
Jun Zhou,Yudong Gu,Youfan Hu,Wenjie Mai,Ping-Hung Yeh,Gang Bao,Ashok K. Sood,Dennis L. Polla,Zhong Lin Wang +8 more
TL;DR: By utilizing Schottky contact instead of Ohmic contact in device fabrication, the UV sensitivity of the ZnO nanowire nanosensor has been improved by four orders of magnitude, and the reset time has been drastically reduced.
Journal ArticleDOI
Ultrathin SnSe2 Flakes Grown by Chemical Vapor Deposition for High‐Performance Photodetectors
Xing Zhou,Lin Gan,Wenming Tian,Qi Zhang,Shengye Jin,Huiqiao Li,Yoshio Bando,Dmitri Golberg,Tianyou Zhai +8 more
TL;DR: In this paper, a high-performance photodetector based on the individual SnSe2 flake demonstrates a high photoresponsivity of 1.1 × 10(3) A W(-1), a high EQE of 2.61 × 10 (5)%, and superb detectivity with 1.01 × 10 10(10) Jones, combined with fast rise and decay times of 14.5 and 8.1 ms, respectively.
Journal ArticleDOI
Selective hydrogen gas nanosensor using individual ZnO nanowire with fast response at room temperature
Oleg Lupan,Oleg Lupan,Veaceslav Ursaki,Guangyu Chai,Lee Chow,Gennadi A. Emelchenko,Ion Tiginyanu,A. N. Gruzintsev,A. N. Redkin +8 more
TL;DR: In this article, a single ZnO nanowire-based nanoscale sensor fabricated using focused ion beam (FIB/SEM) instrument was used to determine the deep levels related to defects and evaluate the effect of thermal treatment in H2 atmosphere on the emission from ZnOs.
References
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Nanowire ultraviolet photodetectors and optical switches
TL;DR: In this paper, the photoconducting properties of individual semiconductor nanowires are explored and the authors show the possibility of creating highly sensitive nanowire switches by exploring the photocconducting properties.
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Fabrication and ethanol sensing characteristics of ZnO nanowire gas sensors
TL;DR: In this paper, ZnO nanowires gas sensors were fabricated with microelectromechanical system technology and ethanol-sensing characteristics were investigated, and the sensor exhibited high sensitivity and fast response to ethanol gas at a work temperature of 300°C.
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Field-Effect Transistors Based on Single Semiconducting Oxide Nanobelts
TL;DR: In this article, field effect transistors (FETs) based on single SnO2 and ZnO nanobelts of thicknesses between 10 and 30 nm have been fabricated.
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Analysis of ultraviolet photoconductivity in ZnO films prepared by unbalanced magnetron sputtering
TL;DR: In this paper, the photoresponse characteristics of polycrystalline ZnO films prepared by the unbalanced magnetron sputtering technique have been analyzed for ultraviolet photodetector applications.
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Photocurrent in ZnO nanowires grown from Au electrodes
Kihyun Keem,Hyun-Suk Kim,Gyu Tae Kim,Jong-Soo Lee,Byungdon Min,Kyoungah Cho,Man Young Sung,Sangsig Kim +7 more
TL;DR: In this paper, the photoresponse of ZnO nanowires under continuous illumination of light with above- or below-gap energies was found to be slow, which indicates that the photocurrent in the nanwires is surface-related rather than bulk-related.