The Effect of UV Illumination on the Room Temperature Detection of Vaporized Ammonium Nitrate by a ZnO Coated Nanospring-Based Sensor

The effect of UV illumination on the room temperature electrical detection of ammonium nitrate vapor was examined. The sensor consists of a self-assembled ensemble of silica nanosprings coated with zinc oxide. UV illumination mitigates the baseline drift of the resistance relative to operation under dark conditions. It also lowers the baseline resistance of the sensor by 25% compared to dark conditions. At high ammonium nitrate concentrations (120 ppm), the recovery time after exposure is virtually identical with or without UV illumination. At low ammonium nitrate concentrations (20 ppm), UV illumination assists with refreshing of the sensor by stimulating analyte desorption, thereby enabling the sensor to return to its baseline resistance. Under dark conditions and low ammonium nitrate concentrations, residual analyte builds up with each exposure, which inhibits the sensor from returning to its original baseline resistance and subsequently impedes sensing due to permanent occupation of absorption sites.

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Sodium alginate assisted construction of ZnSnO 3 microspheres enhanced HCHO sensing performance under UV illumination at room temperature

Micro & Nano Letters ◽

10.1049/mnl.2019.0207 ◽

2019 ◽

Vol 14 (14) ◽

pp. 1381-1384

Author(s):

Jie Chen ◽

Zhihua Ying ◽

Peng Zheng ◽

Rongfa Gao ◽

Jinbang Mei

Keyword(s):

Sodium Alginate ◽

Room Temperature ◽

Uv Illumination ◽

Sensing Performance

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Fabrication of in-situ grown and Pt-decorated ZnO nanoclusters on new-type FTO electrode for room-temperature detection of low-concentration H2S

Journal of Alloys and Compounds ◽

10.1016/j.jallcom.2020.158499 ◽

2021 ◽

Vol 860 ◽

pp. 158499

Author(s):

Jingyue Xuan ◽

Guodong Zhao ◽

Qianqian Gong ◽

Lili Wang ◽

Juanjuan Ren ◽

...

Keyword(s):

Room Temperature ◽

Low Concentration ◽

Temperature Detection ◽

New Type ◽

Zno Nanoclusters

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Room-temperature detection of ammonia and formaldehyde gases by LaxBa1−xSnO3−δ (x = 0 and 0.05) screen printed sensors: effect of ceria and ruthenate sensitization

Applied Physics A ◽

10.1007/s00339-021-04284-4 ◽

2021 ◽

Vol 127 (2) ◽

Author(s):

G. Manjunath ◽

Robbi Vivek Vardhan ◽

Lakkimsetti Lakshmi Praveen ◽

P. Nagaraju ◽

Saumen Mandal

Keyword(s):

Room Temperature ◽

Temperature Detection ◽

Printed Sensors ◽

Screen Printed

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Functionalized Reduced Graphene Oxide Thin Films for Ultrahigh CO2 Gas Sensing Performance at Room Temperature

Nanomaterials ◽

10.3390/nano11030623 ◽

2021 ◽

Vol 11 (3) ◽

pp. 623

Author(s):

Monika Gupta ◽

Huzein Fahmi Hawari ◽

Pradeep Kumar ◽

Zainal Arif Burhanudin ◽

Nelson Tansu

Keyword(s):

Thin Films ◽

Graphene Oxide ◽

Reduced Graphene Oxide ◽

Gas Sensor ◽

Functional Groups ◽

Recovery Time ◽

Room Temperature ◽

Co2 Gas ◽

Reduced Graphene ◽

Response And Recovery

The demand for carbon dioxide (CO2) gas detection is increasing nowadays. However, its fast detection at room temperature (RT) is a major challenge. Graphene is found to be the most promising sensing material for RT detection, owing to its high surface area and electrical conductivity. In this work, we report a highly edge functionalized chemically synthesized reduced graphene oxide (rGO) thin films to achieve fast sensing response for CO2 gas at room temperature. The high amount of edge functional groups is prominent for the sorption of CO2 molecules. Initially, rGO is synthesized by reduction of GO using ascorbic acid (AA) as a reducing agent. Three different concentrations of rGO are prepared using three AA concentrations (25, 50, and 100 mg) to optimize the material properties such as functional groups and conductivity. Thin films of three different AA reduced rGO suspensions (AArGO25, AArGO50, AArGO100) are developed and later analyzed using standard FTIR, XRD, Raman, XPS, TEM, SEM, and four-point probe measurement techniques. We find that the highest edge functionality is achieved by the AArGO25 sample with a conductivity of ~1389 S/cm. The functionalized AArGO25 gas sensor shows recordable high sensing properties (response and recovery time) with good repeatability for CO2 at room temperature at 500 ppm and 50 ppm. Short response and recovery time of ~26 s and ~10 s, respectively, are achieved for 500 ppm CO2 gas with the sensitivity of ~50 Hz/µg. We believe that a highly functionalized AArGO CO2 gas sensor could be applicable for enhanced oil recovery, industrial and domestic safety applications.

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Room temperature detection of NO2 using InSb nanowire

Applied Physics Letters ◽

10.1063/1.3614544 ◽

2011 ◽

Vol 99 (3) ◽

pp. 033103 ◽

Cited By ~ 21

Author(s):

Rajat Kanti Paul ◽

Sushmee Badhulika ◽

Ashok Mulchandani

Keyword(s):

Room Temperature ◽

Temperature Detection

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Phenylalanine Dipeptide-Regulated Ag/In2O3 Nanocomposites for Enhanced NO2 Gas Sensing at Room Temperature with UV Illumination

ACS Applied Nano Materials ◽

10.1021/acsanm.1c02501 ◽

2021 ◽

Author(s):

Zhihua Ying ◽

Xingxin He ◽

Chao Feng ◽

Lili Li ◽

Fei Wen ◽

...

Keyword(s):

Room Temperature ◽

Gas Sensing ◽

Uv Illumination

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Prussian blue-derived hollow cubic α-Fe2O3 for highly sensitive room temperature detection of H2S

Sensors and Actuators B Chemical ◽

10.1016/j.snb.2021.130954 ◽

2021 ◽

pp. 130954

Author(s):

Jiahong Tang ◽

Hao Wang ◽

Xiaoxia Wang ◽

Changsheng Xie ◽

Dawen Zeng

Keyword(s):

Prussian Blue ◽

Room Temperature ◽

Temperature Detection ◽

Highly Sensitive

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Water-Based Indium Tin Oxide Nanoparticle Ink for Printed Toluene Vapours Sensor Operating at Room Temperature

Sensors ◽

10.3390/s18103246 ◽

2018 ◽

Vol 18 (10) ◽

pp. 3246 ◽

Cited By ~ 4

Author(s):

Jan Maslik ◽

Ivo Kuritka ◽

Pavel Urbanek ◽

Petr Krcmar ◽

Pavol Suly ◽

...

Keyword(s):

Tin Oxide ◽

Indium Tin Oxide ◽

Room Temperature ◽

Ambient Air ◽

Protective Atmosphere ◽

Baseline Drift ◽

Nanoparticle Dispersions ◽

Treatment Conditions ◽

Water Based ◽

Different Temperatures

This study is focused on the development of water-based ITO nanoparticle dispersions and ink-jet fabrication methodology of an indium tin oxide (ITO) sensor for room temperature operations. Dimensionless correlations of material-tool-process variables were used to map the printing process and several interpretational frameworks were re-examined. A reduction of the problem to the Newtonian fluid approach was applied for the sake of simplicity. The ink properties as well as the properties of the deposited layers were tested for various nanoparticles loading. High-quality films were prepared and annealed at different temperatures. The best performing material composition, process parameters and post-print treatment conditions were used for preparing the testing sensor devices. Printed specimens were exposed to toluene vapours at room temperature. Good sensitivity, fast responses and recoveries were observed in ambient air although the n-type response mechanism to toluene is influenced by moisture in air and baseline drift was observed. Sensing response inversion was observed in an oxygen and moisture-free N2 atmosphere which is explained by the charge-transfer mechanism between the adsorbent and adsorbate molecules. The sensitivity of the device was slightly better and the response was stable showing no drifts in the protective atmosphere.

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