A highsensitive room temperature gas sensor based on cobalt phthalocyanines and reduced graphene oxide nanohybrids for the ppblevels of ammonia detection† ZhiJiang Guo,a Bin Wang, *a Xiaolin Wang,b Yong Li,a Shijie Gai,a Yiqun Wuac and XiaoLi Chenga Highly sensitive gas sensing materials are of great importance for environmental pollution monitoring. In this study, …
· Gas sensors based on micro and nano technology have allowed for the detection of an important set of gases in several applications. For optimal gas sensor performance, several issues such as ...
· The PSN flexible gas sensor was fabricated by in situ chemical oxidation polymerization process, as revealed in Fig. , the polyimide (PI) substrate with seven pairs of Au interdigitated electrodes was dispersed in PDDA aqueous solution (1%) and PSS aqueous solution (2 mg/mL, pH ≈ 1, adjusted by HCl) to obtain a negative charge on the surface.
· In summary to the reported results, the gas sensing behaviours of MoO 2Nigraphene composites towards formaldehyde, ethanol and NH 3 was guided by the surface absorbed oxygen species. Improvement in sensing response of ethanol for S 3 sample, highlighted the interaction of absorbed oxygen species with ethanol molecules which promotes the electron conduction required …
the possibility of inducing charge carriers to graphene by the adsorption of various gases including H 2O, NH 3 and NO 2. 7 Later, in 2007, graphenebased gas sensors were prepared for aKey Laboratory of Functional Inorganic Material Chemistry, Ministry of Education, School of Chemistry and Materials Science, Heilongjiang University, Harbin 150080,
In this study, we report a novel ammonia (NH 3) gas sensor based on holey graphene thin films. The precursors, holey graphene oxide (HGO) nanosheets, were prepared by etching graphene under UV irradiationwithFentonreagent(Fe2+/Fe3+/H 2O 2). Holey graphene was prepared by the reduction of HGO (rHGO) with pyrrole. Holey graphene thinfilm gas sensors were prepared …
These graphene layers were tested to sense NO2, NH3, and Ethanol at room temperature. The responses of the grapheme based gas sensor are highly reproducible. Schematic of graphene synthesis setup ...
graphenebased gas/vapor sensors, such as NH 3,NO 2,H 2, CO, SO 2,H 2S, as well as vapor of volatile organic compounds. The detection mechanisms pertaining to various gases are also discussed. In conclusion part, some existing problems which may hinder the sensor applications are presented. Several possible methods to solve these problems are proposed, for example, …
· The ammonia sensing properties of singlelayer graphene synthesized by chemical vapor deposition (CVD) were studied. The Au interdigitated electrode (IDE) was prepared by microelectromechanical systems (MEMS) technology, and then, the singlelayer graphene was transferred to the IDE by wet transfer technology. Raman spectroscopy was used to monitor …
graphene interaction for improving the gas selectivity and sensing recovery speed, respectively. Particularly, we measured the scattering strength of the gas adsorbents on graphene and directly resolve the scattering strength spectrum of water, methanol and ethanol adsorption on graphene, achieving the labelfree gas
· Fe 2 O 3 nanoporous network fabricated from Fe 3 O 4 /reduced graphene oxide for highperformance ethanol gas sensor. Sensors and Actuators B: Chemical 255 , …
Holey graphene thinfilm gas sensors were prepared by depositing rHGO suspensions onto the electrodes. The resulting sensing devices show excellent response, sensitivity, and selectivity to NH 3. The resistance change is % when the NH 3level is as low as 1ppm, whereas the resistance change is % when the NH 3level is increased to 50ppm.
The ethanolbased graphene nanomesh sensors exhibited sensitivities of about %/ppm in NO 2 and %/ppm in NH 3 with limits of detection of 15 and 160 ppb, respectively. Our demonstrated studies on controlling the neck width of the nanomesh would lead to further improvement of graphenebased transistors and sensors.
A flexible fabric gas sensor for the detection of subppmlevel NH 3 is reported in this paper. The reduced graphene oxide (rGO)polyaniline (PANI) nanocomposite was successfully coated on cotton thread via an in situ polymerization technique. The …
· The hierarchical structure consisting of gas sensing graphene and ZnO can be successfully applied as an NH 3 gas sensor at room temperature, …
· Fe 2 O 3 nanoporous network fabricated from Fe 3 O 4 /reduced graphene oxide for highperformance ethanol gas sensor. Sensors and Actuators B: Chemical 255 , 3275–3283 (2018). Google Scholar
A novel material synthesized by intercalating CrO3 in the multilayer graphene was used for the fabrication of reversible ammonia (NH3) gas sensor based on resistive transduction mechanism ...
· We present a useful ammonia gas sensor based on chemically reduced graphene oxide (rGO) sheets by selfassembly technique to create conductive networks between parallel Au electrodes. Negative graphene oxide (GO) sheets with large sizes (>10 μm) can be easily electrostatically attracted onto positive Au electrodes modified with cysteamine …
· NH 3, a toxic gas, is very harmful to human health , and it is import to develop ammonia gas sensors and monitor for NH 3 leaks. Hence, we used NH 3 here as analyte in order to probe the sensing properties of the resultant HyrGO and PyrGObased sensors.
SnO 2graphene composite gas sensor for a room temperature detection of ethanol Nanotechnology . 2021 Mar ... composite chemiresistive sensor that can be operated on low power and installed in a compact area for the monitoring of ethanol vapor. The sensor exhibited outstanding sensing responses to 29145 ppm ethanol vapor, providing a sensitivity of 12 …
Rivera et al. [67] reported NH 3 , NO 2 , and ethanol sensing by graphene synthesized using CVD. Studies on determining the sensing mechanism of graphene …
· When the sensor based on the PSN was exposed to NH 3 gas, NH 3 captured the protons from acidified PANI, resulting in the decrease of holes concentration in PANI and the broadening of the depletion layer. Thus, the resistance of PSN further increased. The relative change in the electrical resistance of the sensor was recorded as the response of the sensor. Therefore, the formation of pn …
· Holey graphene thinfilm gas sensors were prepared by depositing rHGO suspensions onto the electrodes. The resulting sensing devices show excellent response, sensitivity, and selectivity to NH3. The resistance change is % when the NH3 level is as low as 1 ppm, whereas the resistance change is % when the NH3 level is increased to 50 ppm. Furthermore, the rHGO thinfilm gas …
· For SnO 2 NCRGO sensor, the response time was about 65 s for NO 2 and 30 s for NH 3. The reported results show great promise in tuning the sensitivity and selectivity of RGObased gas sensors for the realization of high performance RGObased gas sensors. Download : Download fullsize image. Fig. 21.
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