Micro/nanostructured gas sensors: the physics behind the nanostructure growth, sensing and selectivity mechanisms

Chowdhury, Nikita Kar; Bhowmik, Basanta

doi:10.1039/d0na00552e

Cited by 84 publications

(48 citation statements)

References 135 publications

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“…Graphene oxide‐related hybridization can be involved in the geometrical, electronic, and chemical properties of composites to improve the surface properties. The activation energy of the sensing material is essential for gas adsorption/desorption behavior to achieve a low response recovery time and improve selectivity for efficient gas ‐sensing applications 33 …”

Section: Resultsmentioning

confidence: 99%

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Effect of ruthenium oxide on the capacitance and gas‐sensing performances of cobalt oxide @nitrogen‐doped graphene oxide composites

et al. 2021

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Summary Co3O4/RuO2@nitrogen‐doped graphene oxide (NGO) composite materials were synthesized through a sonication‐assisted thermal reduction method in the presence of cobalt and ruthenium starting reagents for supercapacitor and gas sensor applications. The composite materials were characterized using various analytical tools to confirm the structural and morphological properties. The synthesized Co3O4/RuO2@NGO composites showed the nanostructured grains anchored on the NGO surface. The electrochemical storage performance was studied by using cyclic voltammetry, galvanostatic charge discharge, and electrochemical impedance spectroscopy using a two‐electrode asymmetric configuration. The prepared Co3O4/RuO2@NGO electrode exhibited a maximum capacitance of ~149 F/g at an applied current of ~0.5 A/g, an energy density of 20.69 Wh kg−1, and at a power density of 250 W kg−1. The cycling behavior of the fabricated asymmetric capacitor revealed a 90% capacitance retention after 5000 cycles. Moreover, the prepared composite material was used successfully for dimethyl methylophosphonate (DMMP) vapor detection, showing excellent sensitivity, selectivity, and stability. Therefore, the constructed Co3O4/RuO2@NGO composite is a suitable material for supercapacitors and DMMP gas‐detection applications.

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Section: Resultsmentioning

confidence: 99%

“…This result clearly shows the improved sensing characteristics for the DMMP sensor due to the blending of RuO 2 with Co 3 O 4 @NGO in the Co 3 O 4 /RuO 2 @NGO composite formation. The exceptional structural, electronic, chemical, and electrical properties of NGOs also produce a strong response, making them suitable for sensor applications 33 …”

Section: Resultsmentioning

confidence: 99%

Effect of ruthenium oxide on the capacitance and gas‐sensing performances of cobalt oxide @nitrogen‐doped graphene oxide composites

et al. 2021

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“…Therefore, the early detection of toxic gases using reliable electronic gas sensors is extremely important. In this respect, chemiresistive gas sensors are potentially attractive due to their easy manufacturing, simple operating principle, and low cost [ 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 , 10 ]. In the area of resistive-based gas sensors, different semiconducting materials can be used for the realization of gas sensors.…”

Section: Semiconducting Metal Oxide (Smo)-based Gas Sensorsmentioning

confidence: 99%

Effect of Ag Addition on the Gas-Sensing Properties of Nanostructured Resistive-Based Gas Sensors: An Overview

Navale

Shahbaz

Mirzaei

et al. 2021

Sensors

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Nanostructured semiconducting metal oxides (SMOs) are among the most popular sensing materials for integration into resistive-type gas sensors owing to their low costs and high sensing performances. SMOs can be decorated or doped with noble metals to further enhance their gas sensing properties. Ag is one of the cheapest noble metals, and it is extensively used in the decoration or doping of SMOs to boost the overall gas-sensing performances of SMOs. In this review, we discussed the impact of Ag addition on the gas-sensing properties of nanostructured resistive-based gas sensors. Ag-decorated or -doped SMOs often exhibit better responsivities/selectivities at low sensing temperatures and shorter response times than those of their pristine counterparts. Herein, the focus was on the detection mechanism of SMO-based gas sensors in the presence of Ag. This review can provide insights for research on SMO-based gas sensors.

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“…Solid electrolyte gas sensors, electrochemical gas sensors, metal oxide semiconductor sensors (MOS), catalytic combustion gas sensors, and other types of gas sensors have been documented in the literature [14][15][16][17]. MOS type sensors are among the most researched of the many types of gas sensors because they may be used to detect a variety of gases at lower concentrations merely by studying the change in resistance induced by the interaction between the sensing material and the target gas [18][19][20][21]. The operating concept of a gas sensor is based on changes in the sensing material's electrical conductivity.…”

Section: Introductionmentioning

confidence: 99%

“…Most target gas molecules are adsorbed by oxygen ions that have already been adsorbed at the metal-oxide surface due to the large number of surface sites. The charge carrier concentration can be modulated via interactions between adsorbed target species and oxygen ions, changing the material's conductivity (or resistivity) [20].…”

Section: Introductionmentioning

confidence: 99%

p-CuO/n-ZnO Heterojunction Structure for the Selective Detection of Hydrogen Sulphide and Sulphur Dioxide Gases: A Theoretical Approach

et al. 2021

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DFT calculations at the B3LYP/LanL2DZ level of theory were utilized to investigate the adsorption of H2S and SO2 gases on the electronic properties of CuO-ZnO heterojunction structures. The results were demonstrated from the standpoint of adsorption energies (Eads), the density of states (DOS), and NBO atomic charges. The obtained values of the adsorption energies indicated the chemisorption of the investigated gases on CuO-ZnO heterojunction. The adsorption of H2S and SO2 gases reduced the HOMO-LUMO gap in the Cu2Zn10O12 cluster by 4.98% and 43.02%, respectively. This reveals that the Cu2Zn10O12 cluster is more sensitive to the H2S gas than the SO2 gas. The Eads values for SO2 and H2S were −2.64 and −1.58 eV, respectively. Therefore, the Cu2Zn10O12 cluster exhibits a higher and faster response-recovery time to H2S than SO2. Accordingly, our results revealed that CuO-ZnO heterojunction structures are promising candidates for H2S- and SO2-sensing applications.

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Micro/nanostructured gas sensors: the physics behind the nanostructure growth, sensing and selectivity mechanisms

Abstract: Micro/Nano sensors based on oxide semiconductors received worldwide much interest due to their remarkable electrical conductivity and better stability, wide range of dimensional structures, large scale production and cost effective....

Cited by 84 publications

References 135 publications

Effect of ruthenium oxide on the capacitance and gas‐sensing performances of cobalt oxide @nitrogen‐doped graphene oxide composites

Effect of ruthenium oxide on the capacitance and gas‐sensing performances of cobalt oxide @nitrogen‐doped graphene oxide composites

Effect of Ag Addition on the Gas-Sensing Properties of Nanostructured Resistive-Based Gas Sensors: An Overview

p-CuO/n-ZnO Heterojunction Structure for the Selective Detection of Hydrogen Sulphide and Sulphur Dioxide Gases: A Theoretical Approach

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