Reduced Graphene Oxide Screen Printed Thick Film as NO2 Gas Sensor at Low Temperature

2021 ◽  
Vol 1167 ◽  
pp. 43-55
Author(s):  
Anil Patil ◽  
Umesh Tupe ◽  
Arun V. Patil
Keyword(s):  
Graphene Oxide ◽  
Thick Film ◽  
Reduced Graphene Oxide ◽  
Gas Sensing ◽  
Thick Films ◽  
Research Work ◽  
Fast Response ◽  
Gas Sensitivity ◽  
Reduced Graphene ◽  
Sensitivity And Selectivity

Most of the recent reduced graphene oxide (rGO) based sensors shows gas sensitivity above 50o to 150°C. The present investigation deals with the gas sensing at 50°C temperature. In the present research work, thick film sensors of rGO were developed on glass substrate by using standard screen-printing technique. The silver paste of rGO was used to make electrodes for contact on thick films for the electrical and gas sensing system. The electrical properties of rGO thick films such as resistivity, activation energy and temperature coefficient were studied. The resistivity of rGO thick films was found to be 84.84 Ω/m. The morphological, elemental and structural properties of rGO thick films were analyzed by SEM, EDS and XRD techniques respectively. The crystallite size of rGO thick films was found as 28.42 nm by using Scherer’s formula. The rGO thick films were prepared and exposed to Ethanol, NH3, NO2 and LPG gases to determine sensitivity and selectivity. The sensitivity of NO2 has been found to be maximum among other exposed gases. The maximum sensitivity of NO2 gas was 92.55 % at 50 °C found with fast response (~ 11 sec) and recovery (~ 19 sec) time.

scholarly journals N-doped reduced graphene oxide for room-temperature NO gas sensors

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Yu-Sung Chang ◽  
Feng-Kuan Chen ◽  
Du-Cheng Tsai ◽  
Bing-Hau Kuo ◽  
Fuh-Sheng Shieu
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Room Temperature ◽  
Gas Sensing ◽  
Ambient Conditions ◽  
Gas Sensitivity ◽  
Nitrogen Doped ◽  
Low Concentrations ◽  
Reduced Graphene ◽  
P Type

AbstractIn this study, we use nitrogen-doped to improving the gas-sensing properties of reduced graphene oxide. Graphene oxide was prepared according to a modified Hummers’ method and then nitrogen-doped reduced graphene oxide (N-rGO) was synthesized by a hydrothermal method using graphene oxide and NH4OH as precursors. The rGO is flat and smooth with a sheet-like morphology while the N-rGO exhibits folded morphology. This type of folding of the surface morphology can increase the gas sensitivity. The N-rGO and the rGO sensors showed n-type and p-type semiconducting behaviors in ambient conditions, respectively, and were responsive to low concentrations of NO gases (< 1000 ppb) at room temperature. The gas-sensing results showed that the N-rGO sensors could detect NO gas at concentrations as low as 400 ppb. The sensitivity of the N-rGO sensor to 1000 ppb NO (1.7) is much better than that of the rGO sensor (0.012). Compared with pure rGO, N-rGO exhibited a higher sensitivity and excellent reproducibility.

scholarly journals Improving the ammonia sensing of reduced graphene oxide film by using metal nano-materials

2015 ◽  
Vol 18 (3) ◽  
pp. 72-77
Author(s):  
Hoa Tran My Huynh ◽  
Thu Thi Hoang ◽  
Thanh Thi Phuong Nguyen ◽  
Tham Ngoc Nguyen ◽  
Nhung Thi Tuyet Bui ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Gas Adsorption ◽  
Gas Sensing ◽  
High Surface ◽  
Volume Ratio ◽  
Nano Materials ◽  
Gas Sensitivity ◽  
Ammonia Sensing ◽  
Reduced Graphene

Gas sensing is one of the most promising applications for reduced graphene oxide (rGO). High surface-to-volume ratio in conjunction with remaining reactive oxygen functional groups translates into sensitivity to molecular on the rGO surface. The response of the rGO based devices can be further improved by functionalizing its surface with metal nano-materials. In this paper, we report the ammonia (NH3) sensing behavior of rGO based sensors functionalized with nano-structured metal: silver (Ag) or platinum (Pt) or gold (Au) in air at room temperature and atmospheric pressure. The gas response is detected by the monitoring changes in electrical resistance of the rGO/metal hybrids due to NH3 gas adsorption. Compared to bare rGO, significantly improved NH3 sensitivity is observed with the addition of nano-structured metals. These materials are applied to play the small bridges role connecting many graphene islands together to improve electrical conduction of hybrids while maintaining the inherent advantage of rGO for NH3 gas sensitivity.

Zinc Oxide/Reduced Graphene Oxide Nanocomposites for Rapid Detection of Toluene Gas at Room Temperature

2020 ◽  
Vol 18 (10) ◽  
pp. 745-749
Author(s):  
Chih-Chia Wang ◽  
Chiu-Hung Liu ◽  
Hsuan-Hua Hsieh ◽  
Chih-Wei Tang ◽  
Chen-Bin Wang
Keyword(s):  
Zinc Oxide ◽  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Room Temperature ◽  
Gas Sensing ◽  
Fast Response ◽  
Reduced Graphene ◽  
New Strategy ◽  
Recovery Times ◽  
Response And Recovery

In this study, a nanostructured zinc oxide/reduced graphene oxide (ZnO/rGO) composite was deposited on a quartz crystal microbalance (QCM) as a toluene gas sensor at room temperature. A series of ZnO, rGO and ZnO/rGO sensing materials was fabricated and characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), and Raman spectroscopy. There was significant efficiency of the ZnO/rGO composite on the sensing performance for toluene. For specific gas fluxes, the nanostructured ZnO/rGO offered sufficient paths and region for vapor diffusion and adsorption. The sensing test results illustrated that the nanostructured ZnO/rGO composite showed significant enhancement in the frequency shifts (△f) for toluene comparing to pure ZnO and rGO. Also, the ZnO/rGO-coated QCM sensor displayed a fast response (both the response and recovery times < 30 s) and reproducibility for sensing toluene gas at room temperature. We believe that the novel insights on ambient temperature gas sensing on nanostructured ZnO/rGO composite could provide a new strategy for preparing a highly efficient sensing materials.

Enhanced gas sensing and photocatalytic activity of reduced graphene oxide loaded TiO2 nanoparticles

2021 ◽  
pp. 138897
Author(s):  
Suresh Sagadevan ◽  
J. Anita Lett ◽  
Getu Kassegn Weldegebrieal ◽  
Md Rokon ud Dowla Biswas ◽  
Won Chun Oh ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Graphene Oxide ◽  
Tio2 Nanoparticles ◽  
Reduced Graphene Oxide ◽  
Gas Sensing ◽  
Reduced Graphene

scholarly journals Reduced graphene oxide for fiber-optic toluene gas sensing

2016 ◽  
Vol 24 (25) ◽  
pp. 28290 ◽  
Author(s):  
Yi Xiao ◽  
Jianhui Yu ◽  
Long Shun ◽  
Shaozao Tan ◽  
Xiang Cai ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Fiber Optic ◽  
Gas Sensing ◽  
Reduced Graphene

Polymer Foam-Supported Chemically Reduced Graphene Oxide Conductive Networks for Gas Sensing

2018 ◽  
Vol 18 (4) ◽  
pp. 2965-2970 ◽  
Author(s):  
Jiajia Song ◽  
Yanyan Wang ◽  
Feng Zhang ◽  
Yan Ye ◽  
Yanhua Liu ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Gas Sensing ◽  
Polymer Foam ◽  
Reduced Graphene ◽  
Chemically Reduced Graphene Oxide

Cu2O/CuO@rGO heterostructure derived from metal–organic-frameworks as an advanced electrocatalyst for non-enzymatic electrochemical H2O2 sensor

RSC Advances ◽  
2016 ◽  
Vol 6 (105) ◽  
pp. 103116-103123 ◽  
Author(s):  
Duoming Wu ◽  
Zhaodong Xu ◽  
Ting Zhang ◽  
Yubo Shao ◽  
Pinxian Xi ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Metal Organic Frameworks ◽  
Nitrogen Atmosphere ◽  
H2o2 Sensor ◽  
Reduced Graphene ◽  
Sensitivity And Selectivity ◽  
Metal Organic

A hybrid heterostructure comprising well-dispersed Cu2O/CuO particles and reduced graphene oxide (rGO) is synthesized by calcinating a mixture of MOFs-118 and GO in nitrogen atmosphere to improve the sensitivity and selectivity of H2O2 sensors.

Study on gas sensing of reduced graphene oxide/ZnO thin film at room temperature

2017 ◽  
Vol 240 ◽  
pp. 870-880 ◽  
Author(s):  
Yong Zhou ◽  
Xiaogang Lin ◽  
Yang Wang ◽  
Guoqing Liu ◽  
Xiangyi Zhu ◽  
...  
Keyword(s):  
Thin Film ◽  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Room Temperature ◽  
Gas Sensing ◽  
Zno Thin Film ◽  
Reduced Graphene
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