Low-frequency noise characterization of single CuO nanowire gas sensor devices

Steinhauer, Stephan; Köck, Anton; Gspan, Christian; Grogger, Werner; Vandamme, L.K.J.; Pogány, D.

doi:10.1063/1.4931706

Cited by 29 publications

(14 citation statements)

References 44 publications

(48 reference statements)

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“…Considering the geometrical assumptions mentioned above, this corresponds to roughly 10 2 S/m. This crude estimation of typical nanowire electrical conductivities leads to values that are reasonably comparable to four point measurements on single CuO nanowires with considerably larger diameters in similar environmental conditions . Additional transmission electron microscopy results for CuO nanowire characterization can be found in the Supporting Information (Figure S1).…”

supporting

confidence: 69%

“…This crude estimation of typical nanowire electrical conductivities leads to values that are reasonably comparable to four point measurements on single CuO nanowires with considerably larger diameters in similar environmental conditions. 24 Additional transmission electron microscopy results for CuO nanowire characterization can be found in the Supporting Information (Figure S1). The material composition was confirmed by comparing the electron energy loss near-edge fine structure with literature results for CuO.…”

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confidence: 99%

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Local CuO Nanowire Growth on Microhotplates: In Situ Electrical Measurements and Gas Sensing Application

et al. 2016

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We report on local CuO nanowire growth on microhotplates combined with in situ measurement of the electrical resistance for well-controlled integration into conductometric gas sensing devices. Discrete current steps were observed during the CuO nanowire synthesis process, which is attributed to individual nanowire connections being formed. The high gas sensitivity of the CuO nanowire devices was confirmed by detection of carbon monoxide CO in the low ppm-level concentration range. Furthermore, we demonstrate that CuO nanowire growth inside a gas measurement setup allows studies on gas sensor poisoning/deactivation processes. A significant decrease of CO response was found after controlled exposure to humidity, which suggests sensor deactivation by surface hydroxylation. Thus our approach could be a novel and simple way for revealing new insights in various gas sensor degradation mechanisms in the future and might be also adapted for different metal oxide nanomaterials.

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confidence: 69%

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confidence: 99%

Local CuO Nanowire Growth on Microhotplates: In Situ Electrical Measurements and Gas Sensing Application

et al. 2016

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“…Decreasing CuO nanowire conductivity for decreasing O 2 pressure was found, which can be interpreted by reduced hole accumulation close to the surface due to a lower number of ionosorbed oxygen species. These findings are consistent with previous reports on the p-type conductivity of CuO nanowires 13,24 and confirm the chemoresistive properties sensitive to changes of the gaseous environment in the environmental TEM.…”

supporting

confidence: 93%

Probing electron beam effects with chemoresistive nanosensors during in situ environmental transmission electron microscopy

Steinhauer

Wang

Krainer

et al. 2017

Applied Physics Letters

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We report in situ and ex situ fabrication approaches to construct p-type (CuO) and n-type (SnO2) metal oxide nanowire devices for operation inside an environmental transmission electron microscope (TEM). By taking advantage of their chemoresistive properties, the nanowire devices were employed as sensitive probes for detecting reactive species induced by the interactions of high-energy electrons with surrounding gas molecules, in particular, for the case of O2 gas pressures up to 20 mbar. In order to rationalize our experimental findings, a computational model based on the particle-in-cell method was implemented to calculate the spatial distributions of scattered electrons and ionized oxygen species in the environmental TEM. Our approach enables the a priori identification and qualitative measurement of undesirable beam effects, paving the way for future developments related to their mitigation.

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“…Many sorts of p-type metal-oxide semiconductors have been synthesized for gas-sensor applications [22][23][24] considering their advantages of p-type semiconducting nature 25,26 compared with n-type materials, including low humidity dependence, good catalytic properties, 27 and high signal-to-noise ratio. 28 Among p-type semiconductors, CuO has a narrow bandgap ($ 1.2 eV) and is thus extensively used because of its robustness and abundance. [29][30][31][32][33] However, pristine CuO materials show relatively low sensitivity and long response/recovery times.…”

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confidence: 99%

Facile Synthesis of Pd-CuO Nanoplates with Enhanced SO2 and H2 Gas-Sensing Characteristics

Nha

Tong

Duy

et al. 2021

J. Electron. Mater.

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Because of the robustness and high catalytic activity of p-type CuO semiconducting nanostructures, they are applied as sensing materials for various gases. However, pristine CuO materials exhibit relatively low sensing performance to some gases, such as SO 2 and H 2 . Here, we demonstrate an enhancement in the gas-sensing characteristics of CuO nanoplates through surface decoration with Pd nanoparticles. CuO nanoplates were synthesized by a facile hydrothermal method, and Pd nanoparticles were decorated effectively via a directed room-temperature reducing pathway without need for stabilizing agents. The Pd-CuO nanoplates exhibited superior sensitivity, fast response, and recovery times to SO 2 and H 2 compared with their pristine CuO counterpart. The gas-sensing mechanism is discussed from the perspective of the heterojunction between Pd and CuO, as well as the catalytic activity of Pd for the dissociation of gaseous molecules. Such Pd-CuO nanoplate-based sensors could be effectively applied for SO 2 and H 2 gas monitoring.

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Low-frequency noise characterization of single CuO nanowire gas sensor devices

Cited by 29 publications

References 44 publications

Local CuO Nanowire Growth on Microhotplates: In Situ Electrical Measurements and Gas Sensing Application

Local CuO Nanowire Growth on Microhotplates: In Situ Electrical Measurements and Gas Sensing Application

Probing electron beam effects with chemoresistive nanosensors during in situ environmental transmission electron microscopy

Facile Synthesis of Pd-CuO Nanoplates with Enhanced SO2 and H2 Gas-Sensing Characteristics

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