High aspect ZnO nanostructures based hydrogen sensing
03 Jun 2013-Vol. 1536, Iss: 1, pp 291-292
TL;DR: The morphology of nanostructures formulated thereafter was characterized using Field Emission Scanning Electron Microscope (FESEM), X-Ray Diffraction (XRD), Energy-Dispersive X ray Spectroscopy (EDAX), these structures are envisioned for Hydrogen sensing.
Abstract: ZnO nano structure arrays on silicon substrate using chemical treatment have been developed. The morphology of nanostructures formulated thereafter was characterized using Field Emission Scanning Electron Microscope (FESEM), X-Ray Diffraction (XRD), Energy-Dispersive X ray Spectroscopy (EDAX). These structures are envisioned for Hydrogen sensing. High reconditionability with moderate sensitivity has been achieved with the developed nanostructures.
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01 Jan 2021
TL;DR: In this article, hydrogen sensing characteristics of reduced graphene oxide (rGO) based functional nanomaterials are investigated with first principle calculations and experimental analysis, and the influence of gas adsorption on the electronic features of the functional nanostructures are analyzed using first principles density functional theory.
Abstract: In this work, hydrogen sensing characteristics of reduced graphene oxide (rGO) based functional nanomaterials are investigated with first principle calculations and experimental analysis. rGO doped with zinc oxide nanomaterial (i.e. rGO-ZnO), rGO-ZnO with silver nanoparticles (rGO-ZnO-Ag), rGO-ZnO with zirconium oxide (rGO-ZnO-ZrO2), rGO-ZnO doped with silver and palladium (rGO-ZnO-Ag-Pd) are investigated for their sensing capabilities. The influence of gas adsorption on the electronic features of the functional nanostructures are analyzed using the first principles density functional theory. The results of the computation reveal a considerable improvement of graphene oxide sensitivity in the hydrogen gas molecules following hybridization by ZnO, ZnO–Ag, ZnO–Ag–Pd and ZrO2. Fabrication and characterization of aforementioned functional materials and their hydrogen sensing performances are performed and essential sensing characteristics viz., sensitivity, response time, recovery time, reproducibility are also investigated. Out of the fabricated films, rGO-ZnO-Ag-Pd film is found to have the highest sensitivity towards hydrogen. It showed the sensitivity of ∼60% and highest performance factor (evaluated as the ratio of sensitivity to cycle time) among all films, including response time as 10 s and recovery time as 14 s. While performing sensing investigation, the distinct p-type behavior was observed for all the fabricated film. Obtained outcomes relate the promising future of rGO doped ZnO–Ag, ZnO–Ag–Pd and ZrO2 hybrid nano sensor in the advancement of sensitive gas sensors.
28 citations
TL;DR: In this article, the authors reported an excellent gas sensing performance of the unique nanocomposite films prepared with the help of different materials such as semiconductor metaloxide, polymer and metal for carbon monoxide gas sensing at ambient temperature.
Abstract: In the present work, we report an excellent gas sensing performance of the unique nanocomposite films prepared with the help of different materials such as semiconductor metal-oxide, polymer and metal for carbon monoxide gas sensing at ambient temperature. The fabrication of SnO2/PANI/Pd nanocomposite film was performed using the hydrothermal route. The fabricated films were characterized with various analytical techniques such as X-ray diffraction (XRD), Field emission scanning electron microscope (FESEM), and Raman spectroscopy, Fourier transform infrared spectroscopy (FTIR) etc. Furthermore, DFT results are used to examine the transport and electronic properties of all prepared films. The computing results show that after hybridizing with Pd and SnO2, the response of the fabricated SnO2 and polyaniline (PANI) films to CO gas molecules is considerably improved. At room temperature, sensing characterization of the fabricated sensing films was carried out by using target gas concentrations with varying ppm level of 50–300. At ambient temperature, the SnO2/PANI/Pd film has the maximum sensitivity ~ 400.8% out of all the fabricated films at 0.3% of the target gas. Our findings show that SnO2, SnO2/Pd, PANI, and SnO2/PANI/Pd composite sensing films have a bright future in the gas sensing application with incredibly-higher sensitivity towards CO gas.
21 citations
19 Nov 2020
TL;DR: In this article, the authors proposed a promising gas sensing material due to its large surface-to-volume ratio, narrow band gap, and excellent absorptions, and demonstrated that MoSe2-based gas sensors possess infe...
Abstract: Molybdenum diselenide (MoSe2) is a promising gas sensing material due to its large surface-to-volume ratio, narrow band gap, and excellent absorptions. However, MoSe2-based gas sensors possess infe...
19 citations
TL;DR: In this article, the authors explore several means of fabricating nanostructured films and evaluating their sensing characteristics, such as Palladium-sputtered nanoprocessors.
Abstract: This paper reports on miniaturized hydrogen sensing platforms, exploring several means of fabricating nanostructured films and evaluating their sensing characteristics. Palladium-sputtered nanoporo...
16 citations
Cites background from "High aspect ZnO nanostructures base..."
...Trace detection of hydrogen has always posed a challenge, and various sensing elements that use suitable morphological changes at the nanoscale level to enhance their surface area have been realized in the past [13-15]....
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TL;DR: In this paper, a theoretical modeling for ZnO crystal vertical growth is proposed and its epitaxial growth rate along with side length and with function of time is investigated based on the experimental observation.
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