Cu/graphene interdigitated electrodes with various copper thicknesses for UV-illumination-enhanced gas sensors at room temperature

2020 ◽  
Vol 22 (44) ◽  
pp. 25769-25779
Author(s):  
Min Zhao ◽  
Attia Falak ◽  
Yi Tian ◽  
Lanqin Yan ◽  
Rujun Liu ◽  
...  
Keyword(s):  
Gas Sensors ◽  
Room Temperature ◽  
High Efficiency ◽  
Uv Light ◽  
Light Illumination ◽  
Interdigitated Electrodes ◽  
Uv Illumination

High efficiency detection of NO2 and NH3 by 8 nm Cu/graphene sensor at room temperature under UV light illumination.

Room-Temperature ZnO Nanoparticle Ethanol Gas Sensors under UV Illumination

2012 ◽  
Vol 486 ◽  
pp. 39-43 ◽  
Author(s):  
S.P. Chang
Keyword(s):  
Gas Sensor ◽  
Gas Sensors ◽  
Spin Coating ◽  
Room Temperature ◽  
Uv Light ◽  
Light Illumination ◽  
Zno Nanoparticle ◽  
Uv Illumination ◽  
Potential Applications ◽  
Nanoparticle Film

A zinc oxide (ZnO) nanoparticle gas sensor was formed by spin coating. We annealed the film at 400, 600, and 800°C for 1 h in air to create a gas sensor. The responses of the gas sensor to ethanol under UV light illumination were investigated. We found that the ZnO nanoparticle film annealed at 800°C had the highest sensitivity. This can be attributed to the fact that the defects of ZnO nanoparticle film annealed at 800°C are considerably more than those for the film annealed at other temperatures. This study demonstrates that ZnO nanoparticles have potential applications as room-temperature ethanol sensors.

scholarly journals UV Illumination Room-Temperature ZnO Nanoparticle Ethanol Gas Sensors

2012 ◽  
Vol 2012 ◽  
pp. 1-5 ◽  
Author(s):  
Sheng-Po Chang ◽  
Kuan-Yu Chen
Keyword(s):  
Gas Sensor ◽  
Gas Sensors ◽  
Room Temperature ◽  
Uv Light ◽  
Light Illumination ◽  
Zno Nanoparticle ◽  
Uv Illumination ◽  
Potential Applications ◽  
Film Annealing ◽  
Nanoparticle Film

Zinc oxide (ZnO) nanoparticle gas sensor was formed by spin coating. We annealed the film at 400, 600, and 800°C for 1 hour in air to make gas sensor. The responses of gas sensor to ethanol with UV light illumination were investigated. It could be observed that the ZnO nanoparticle film annealing at 800°C has the highest sensitivity. It can be attributed to the defects of ZnO nanoparticle film annealing at 800°C much more than other annealing temperatures. The study shows that the ZnO nanoparticles have potential applications as RT ethanol sensors.

NOx gas sensors based on layer-transferred n-MoS2/p-GaN heterojunction at room temperature: Study of UV light illuminations and humidity

2020 ◽  
Vol 308 ◽  
pp. 127700 ◽  
Author(s):  
Maddaka Reddeppa ◽  
Byung-Guon Park ◽  
G. Murali ◽  
Soo Ho Choi ◽  
Nguyen Duc Chinh ◽  
...  
Keyword(s):  
Gas Sensors ◽  
Room Temperature ◽  
Uv Light ◽  
Temperature Study

scholarly journals Synthesis of g-C3N4-Decorated ZnO Porous Hollow Microspheres for Room-Temperature Detection of CH4 under UV-Light Illumination

Nanomaterials ◽  
2019 ◽  
Vol 9 (11) ◽  
pp. 1507 ◽  
Author(s):  
Min Xiao ◽  
Yanwei Li ◽  
Bo Zhang ◽  
Guang Sun ◽  
Zhanying Zhang
Keyword(s):  
Room Temperature ◽  
Gas Sensing ◽  
Uv Light ◽  
Response Speed ◽  
Hollow Microspheres ◽  
Oxide Semiconductor ◽  
Light Illumination ◽  
Long Term Stability ◽  
Temperature Detection ◽  
Good Repeatability

UV light-assisted gas sensors based on metal oxide semiconductor (MOS) have attracted much attention in detecting flammable and explosive gases at room temperature. In this paper, graphite-based carbon nitride (g-C3N4) nanosheets-decorated ZnO porous hollow microspheres (PHMSs) with the size about 3~5 μm in diameter were successfully synthesized by annealing the solvothermally-synthesized Zn5(CO3)2(OH)6 PHMSs together with g-C3N4. The synthesized samples were characterized by XRD, SEM, TEM, FT-IR and XPS. The results indicated that the prepared g-C3N4/ZnO PHMSs were constructed by numerous loosely stacked ZnO nanoparticles of 20~30 nm in diameter. Gas sensing tests indicated that under UV light (365~385 nm) illumination, the sensors fabricated with g-C3N4/ZnO HPMSs showed an enhanced response and faster response speed than the pure ZnO counterpart at room temperature. In addition, the g-C3N4/ZnO sensor also exhibited good repeatability and long-term stability for CH4 detection.

Photodegradation of Pb-3,4-dihydroxybenzoic acid complex under UV light illumination

2012 ◽  
Vol 65 (5) ◽  
pp. 948-953
Author(s):  
Xuefeng Hu ◽  
Wei Qin
Keyword(s):  
Uv Light ◽  
Light Illumination ◽  
Dihydroxybenzoic Acid ◽  
Solution Ph ◽  
Acid Complex ◽  
Uv Illumination ◽  
Vis Spectroscopy ◽  
Ft Ir ◽  
Ph Conditions ◽  
Total Organic Carbon Analysis

The degradation of 3,4-dihydroxybenzoic acid (3,4-DHBA) in the presence and absence of Pb2+ under UV illumination was studied. Addition of Pb2+ caused the formation of precipitate during photoreaction when the solution pH was higher than 6. The presence of Pb2+ remarkably inhibited the degradation of 3,4-DHBA and its photodegradation intermediates, while complexation of 3,4-DHBA and its photodegradation intermediates with Pb2+ decreased the free Pb2+ in aqueous solutions. Molecular oxygen played an important role in photodegradation of 3,4-DHBA in the presence of Pb2+. UV–Vis spectroscopy was used to investigate the interaction between Pb2+ and 3,4-DHBA at different pH conditions, and FT-IR was used to characterize the precipitate formed during photoreaction. The mineralization of 3,4-DHBA was investigate by total organic carbon analysis.

Equivalence between thermal and room temperature UV light-modulated responses of gas sensors based on individual SnO2 nanowires

2009 ◽  
Vol 140 (2) ◽  
pp. 337-341 ◽  
Author(s):  
J.D. Prades ◽  
R. Jimenez-Diaz ◽  
F. Hernandez-Ramirez ◽  
S. Barth ◽  
A. Cirera ◽  
...  
Keyword(s):  
Gas Sensors ◽  
Room Temperature ◽  
Uv Light ◽  
Sno2 Nanowires

Experimental analysis of UV-activated ethanol sensor based on the formation of organic/inorganic heterojunction

Circuit World ◽  
2020 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Radha Sankararajan ◽  
Kirubaveni Savarimuthu ◽  
Sudha Murugesan ◽  
Kiruthika Ramany ◽  
Govindaraj Rajamanickam ◽  
...  
Keyword(s):  
Seed Layer ◽  
Room Temperature ◽  
Uv Light ◽  
Structural Parameters ◽  
Light Illumination ◽  
Quick Response ◽  
Ethanol Sensor ◽  
Content Type ◽  
Doped Zno ◽  
Sensing Performance

Purpose The purpose of this paper is to fabricate an ethanol sensor which has bio-friendly and eco-friendly properties compared to the commercially available ethanol sensors. Design/methodology/approach This paper describes the construction of a highly sensitive ethanol sensor with low ppm level detection at room temperature by integrating three techniques. The first deals with the formation of organic/inorganic p-n heterojunction. Second, tuning of structural parameters such as length, diameter and density of Zinc Oxide (ZnO) nanostructure was achieved through introduction of the Fe dopant into a pure ZnO seed layer. Furthermore, ultra-violet (UV) light photoactivation approach was used for enhancing the sensing performance of the fabricated sensors. Four different sensors were fabricated by combing the above approaches. The structural, morphological, optical and material compositions were characterized using different characterization techniques. Sensing behavior of the fabricated sensors toward ethanol was experimented at room temperature with and without UV illumination combined with stability studies. It was observed that all the fabricated sensors showed enhanced sensing performance for 10 ppm of ethanol. In specific, FNZ (Fe-doped ZnO seeded Ni-doped Zn nanorods) sensor exhibited a higher response at 2.2 and 13.5 s for 5 ppm and 100 ppm of ethanol with UV light illumination at room temperature, respectively. The photoactivated FNZ sensor showed quick response and speedy recovery at 18 and 30 s, respectively, for 100 ppm ethanol. Findings In this study, the authors have experimentally analyzed the effect of Fe (in ZnO seed layer and ZnO NRs) and Ni (in ZnO NRs) dopants in the room temperature sensing performance (with and without UV light) of the fabricated ethanol sensors. Important sensing parameters like sensitivity, recovery and response time of all the fabricated sensors are reported. Originality/value The Fe doped ZnO seeded Ni doped Zn nanorods (FNZ sample) showed a higher response at 2.2 s and 13.5 s for very low 5 ppm and 10 ppm of ethanol at room temperature under UV light illumination when compared to the other fabricated sensors in this paper. Similarly, this sensor also had quick response (18 s) and speedy recovery (30 s) for 100 ppm ethanol.

Ultrasensitive room temperature ppb-level NO2 gas sensors based on SnS2/rGO nanohybrids with P–N transition and optoelectronic visible light enhancement performance

2019 ◽  
Vol 7 (28) ◽  
pp. 8616-8625 ◽  
Author(s):  
Yifan Huang ◽  
Weicheng Jiao ◽  
Zhenming Chu ◽  
Guomin Ding ◽  
Meiling Yan ◽  
...  
Keyword(s):  
Visible Light ◽  
Gas Sensors ◽  
Room Temperature ◽  
Light Illumination ◽  
Light Enhancement ◽  
Visible Light Illumination ◽  
No2 Gas Sensors

SnS2/rGO gas sensors were developed, with P–N transition response for room temperature ppb-level NO2 detection and visible light illumination enhancement behavior.

Study on TiO2-doped ZnO thick film gas sensors enhanced by UV light at room temperature

2008 ◽  
Vol 39 (9) ◽  
pp. 1120-1125 ◽  
Author(s):  
Yanghai Gui ◽  
Shumian Li ◽  
Jiaqiang Xu ◽  
Chao Li
Keyword(s):  
Thick Film ◽  
Gas Sensors ◽  
Room Temperature ◽  
Uv Light ◽  
Doped Zno

Effect of UV Illumination on Deposition of Low-k Si-O-C(-H) Films by PECVD

2004 ◽  
Vol 449-452 ◽  
pp. 473-476 ◽  
Author(s):  
Heon Ju Lee ◽  
Chang Sil Yang ◽  
Chi Kyu Choi
Keyword(s):  
Plasma Parameter ◽  
Uv Light ◽  
Chemical Vapor ◽  
Light Illumination ◽  
Plasma Chemical ◽  
Dielectric Thin Film ◽  
Plasma Chemical Vapor Deposition ◽  
Low Dielectric ◽  
Uv Illumination ◽  
Low K

The characteristics of plasma are important for the deposition of SiOC(-H) low dielectric thin film. The effect of UV light illumination on the plasma parameter in the capacitive coupled plasma chemical vapor deposition (CCP-CVD) system is investigated. The electron density is almost not changed, but the electron temperature decreases by UV light illumination. The deposition rate increases and the dielectric constant of the film is lowered with UV light.

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