On mechanism of NO2 detection by ZnO excitonic luminescence

2015 ◽  
Vol 210 ◽  
pp. 706-711 ◽  
Author(s):  
E. Orabona ◽  
D. Pallotti ◽  
A. Fioravanti ◽  
S. Gherardi ◽  
M. Sacerdoti ◽  
...  
Keyword(s):  
Excitonic Luminescence ◽  
No2 Detection

Nonequilibrium characteristics of excitonic luminescence

2003 ◽  
Author(s):  
W. Hoyer ◽  
S.W. Koch ◽  
M. Kira ◽  
P. Brick ◽  
S. Chatterjee ◽  
...  
Keyword(s):  
Excitonic Luminescence

scholarly journals Gas Sensors Based on Mechanically Exfoliated MoS2 Nanosheets for Room-Temperature NO2 Detection

Sensors ◽  
2019 ◽  
Vol 19 (9) ◽  
pp. 2123 ◽  
Author(s):  
Wenli Li ◽  
Yong Zhang ◽  
Xia Long ◽  
Juexian Cao ◽  
Xin Xin ◽  
...  
Keyword(s):  
Gas Sensors ◽  
High Performance ◽  
Density Functional ◽  
Room Temperature ◽  
Mos2 Nanosheets ◽  
Mechanical Exfoliation ◽  
High Responsivity ◽  
Recovery Behavior ◽  
No2 Gas Sensors ◽  
No2 Detection

The unique properties of MoS2 nanosheets make them a promising candidate for high-performance room temperature gas detection. Herein, few-layer MoS2 nanosheets (FLMN) prepared via mechanical exfoliation are coated on a substrate with interdigital electrodes for room-temperature NO2 detection. Interestingly, compared with other NO2 gas sensors based on MoS2, FLMN gas sensors exhibit high responsivity for room-temperature NO2 detection, and NO2 is easily desorbed from the sensor surface with an ultrafast recovery behavior, with recovery times around 2 s. The high responsivity is related to the fact that the adsorbed NO2 can affect the electron states within the entire material, which is attributed to the very small thickness of the MoS2 nanosheets. First-principles calculations were carried out based on the density functional theory (DFT) to verify that the ultrafast recovery behavior arises from the weak van der Waals binding between NO2 and the MoS2 surface. Our work suggests that FLMN prepared via mechanical exfoliation have a great potential for fabricating high-performance NO2 gas sensors.

Excitonic Luminescence from Self-Organized Quantum Dots of CdTe Grown by Molecular Beam Epitaxy

1999 ◽  
Vol 38 (Part 1, No. 4B) ◽  
pp. 2524-2528 ◽  
Author(s):  
Shinji Kuroda ◽  
Yoshikazu Terai ◽  
Kôki Takita ◽  
Tsuyoshi Okuno ◽  
Yasuaki Masumoto
Keyword(s):  
Quantum Dots ◽  
Molecular Beam Epitaxy ◽  
Molecular Beam ◽  
Self Organized ◽  
Excitonic Luminescence

Edge-enriched WS2 nanosheets on carbon nanofibers boosts NO2 detection at room temperature

2021 ◽  
Vol 411 ◽  
pp. 125120
Author(s):  
Yongshan Xu ◽  
Jiayue Xie ◽  
Yunfan Zhang ◽  
FengHui Tian ◽  
Chen Yang ◽  
...  
Keyword(s):  
Carbon Nanofibers ◽  
Room Temperature ◽  
Ws2 Nanosheets ◽  
No2 Detection

rGO functionalized α-Fe2O3/Co3O4 heterojunction for NO2 detection

2021 ◽  
pp. 131194
Author(s):  
Lixia Sun ◽  
Jianhua Sun ◽  
Kewei Zhang ◽  
Xi Sun ◽  
Shouli Bai ◽  
...  
Keyword(s):  
No2 Detection

Promoting effects of Ag on In2O3 nanospheres of sub-ppb NO2 detection

2017 ◽  
Vol 241 ◽  
pp. 489-497 ◽  
Author(s):  
Bingxin Xiao ◽  
Shanliang Song ◽  
Pan Wang ◽  
Qi Zhao ◽  
Mingyan Chuai ◽  
...  
Keyword(s):  
No2 Detection

scholarly journals Comparison of nitrous acid detection using open-path incoherent broadband cavity-enhanced absorption spectroscopy and extractive long-path absorption photometry

2021 ◽  
Author(s):  
Sophie Dixneuf ◽  
Albert A. Ruth ◽  
Rolf Häseler ◽  
Theo Brauers ◽  
Franz Rohrer ◽  
...  
Keyword(s):  
Absorption Spectroscopy ◽  
Nitrous Acid ◽  
Hot Spot ◽  
Integration Time ◽  
Mixing Ratios ◽  
Enhanced Absorption ◽  
Cavity Enhanced Absorption Spectroscopy ◽  
Open Path ◽  
Ccd Detector ◽  
No2 Detection

Abstract. An instrument based on 20 m open-path incoherent broadband cavity-enhanced absorption spectroscopy (IBBCEAS) was established at the Jülich SAPHIR chamber in Spring 2011. The setup was optimized for the detection of HONO and NO2 in the near UV region 352–386 nm, utilizing a bright hot-spot Xe-arc lamp and a UV-enhanced CCD detector. A 2σ detection limit of 26 pptv for HONO and 76 pptv for NO2 was achieved for an integration time of 1 min. Methacrolein has also been detected at mixing ratios below 5 ppbv. The IBBCEAS instrument’s performance for HONO and NO2 detection was compared to that of extractive wet techniques, long-path absorption photometry (LOPAP) and chemiluminescence spectrometry (CLS) NOx detection, respectively.

scholarly journals Effect of GNWs/NiO-WO3/GNWs Heterostructure for NO2 Gas Sensing at Room Temperature

Sensors ◽  
2022 ◽  
Vol 22 (2) ◽  
pp. 626
Author(s):  
Seokhun Kwon ◽  
Seokwon Lee ◽  
Joouk Kim ◽  
Chulmin Park ◽  
Hosung Jung ◽  
...  
Keyword(s):  
Particulate Matter ◽  
Room Temperature ◽  
Microwave Plasma ◽  
Gas Sensing ◽  
Chemical Vapor ◽  
Gas Concentration ◽  
Negative Change ◽  
Low Concentrations ◽  
Detection Characteristics ◽  
No2 Detection

Recently, as air pollution and particulate matter worsen, the importance of a platform that can monitor the air environment is emerging. Especially, among air pollutants, nitrogen dioxide (NO2) is a toxic gas that can not only generate secondary particulate matter, but can also derive numerous toxic gases. To detect such NO2 gas at low concentration, we fabricated a GNWs/NiO-WO3/GNWs heterostructure-based gas sensor using microwave plasma-enhanced chemical vapor deposition (MPECVD) and sputter, and we confirmed the NO2 detection characteristics between 10 and 50 ppm at room temperature. The morphology and carbon lattice characteristics of the sensing layer were investigated using field emission scanning electron microscopy (FESEM) and Raman spectroscopy. In the gas detection measurement, the resistance negative change according to the NO2 gas concentration was recorded. Moreover, it reacted even at low concentrations such as 5–7 ppm, and showed excellent recovery characteristics of more than 98%. Furthermore, it also showed a change in which the reactivity decreased with respect to humidity of 33% and 66%.

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