Morphology controlled syntheses of Cr doped ZnO single-crystal nanorods for acetone gas sensor

Zhang, G.H.; Deng, Xinyang; Wang, P.Y.; Wang, X.L.; Chen, Y.; Ma, Haiqing; Gengzang, D.J.

doi:10.1016/j.matlet.2015.11.112

Cited by 44 publications

(14 citation statements)

References 9 publications

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“…(22), the substitution of Zn 2+ with Cr 3+ into ZnO crystal lattice releases one free electron to the system. These free electrons increases the density of surface adsorbed oxygen species, as well as, the system conductivity 11 . The remarkable sensitivity and selectivity demonstrated by the 0.5 wt% Cr/ZnO sensor explains the relevance of this material for sensing other toxic gases such as ammonia, hydrogen sulfide, nitrogen dioxide and phosgene.…”

Section: Resultsmentioning

confidence: 99%

“…has successfully doped Cr precursor into ZnO nanorods by hydrothermal method. The ZnO–Cr system was used in the gas sensing studies of reducing and toxic gas such as ammonia; flammable and volatile liquids such as acetone and ethanol; corrosive liquid such as acetic acid; and organic solvent such as dimethyl formamide, at operating temperature of 300 °C 11 . From the literature review, it is evidenced that the enhanced gas sensing response of ZnO for various test gases with different dopants occurs at temperatures above 200 °C.…”

Section: Introductionmentioning

confidence: 99%

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Enhanced Carbon monoxide-sensing properties of Chromium-doped ZnO nanostructures

Habib

Tajuddin

Noor

et al. 2019

Sci Rep

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Low power consumption, fast response and quick recovery times are important parameters for gas sensors performance. Herein, we report the experimental and theoretical studies of ZnO and Cr doped ZnO nanostructures used in low temperature (50 °C) sensors for the detection of CO. The synthesized films were characterized by XRD, UV-Vis, FE-SEM and EDX. The XRD patterns for the ZnO and 0.5 wt% Cr/ZnO films confirm the formation of a single-phase hexagonal wurtzite structure. The reduction of the ZnO optical band gap from 3.12 eV to 2.80 eV upon 0.5 wt% Cr doping is well correlated with the simulation data. The FE-SEM images of the films show spherical morphology with the estimated particle sizes of about ~40 nm and ~ 25 nm were recorded for the ZnO and 0.5 wt% Cr/ZnO films, respectively. Enhanced gas sensing performance is achieved with Cr doping and the sensitivity of ZnO increases from 9.65% to 65.45%, and simultaneously decreasing the response and recovery times from 334.5 s to 172.3 s and from 219 s to 37.2 s, respectively. These improvements in gas sensing performance are due to the reduction in particle size and optical band gap, and an increase in specific surface area.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Enhanced Carbon monoxide-sensing properties of Chromium-doped ZnO nanostructures

Habib

Tajuddin

Noor

et al. 2019

Sci Rep

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“…The Cr-doped ZnO sensor presents the response of 104 to 100 ppm acetone at 300°C, as is four times higher than that of ZnO sensor. The increase of electron concentration optimized by Cr doping improved the sensing response and selectivity [31].…”

Section: Dopingmentioning

confidence: 98%

ZnO Nanorods for Gas Sensors

Wang¹

2020

Nanorods and Nanocomposites

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ZnO nanorods have been widely used to detect low-concentration gases due to its range of conductance variability, response toward both oxidative and reductive gases, and highly sensitive and selective properties. In this chapter, the fabrication methods of ZnO nanorods, their controllable growth, their different configurations, their modification for improving sensing property, and their composites for gas sensors are thoroughly introduced. The synthesis methods to fabricate ZnO nanorods consist of hydrothermal method, microemulsion synthesis, microwaveassisted hydrolysis preparation, gas-solution-solid method, spray pyrolysis, sonochemical route, simple solution route, and so on. The controllable fabrication of ZnO nanorods can be realized by control growth, selective growth, and diameter regulation. Different structures formed by ZnO nanorods include cross-linked configuration, flowerlike structure, and multishelled hollow spheres and hollow microsemispheres, as influence their sensing properties. ZnO nanorods can be modified by doping, functionalization, decoration, and sensitization for enhancing the sensing property. ZnO can be combined with graphene, carbon nanotubes, SnO 2 , In 2 O 3 , and Fe 2 O 3 to form core-shell composites for gas sensor.

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“…Despite these advantages, the working temperature of ZnO gas sensors is defined as approximately 300 °C. 18 Several methods have been published to reduce the working temperature of ZnO sensors, such as ultraviolet (UV) illumination, 19 microheater chips, 20 and metal doping. 21 In a previous report, ZnO microwire gas sensors optimized by surface etching and UV illumination were introduced by Wang et al 22 Gas-sensing measurements provide a novel application to optimize the property of gas sensors working at low temperatures by using a photoinduced effect.…”

Section: Introductionmentioning

confidence: 99%

High Sensitivity of NO Gas Sensors Based on Novel Ag-Doped ZnO Nanoflowers Enhanced with a UV Light-Emitting Diode

Tsai

Chang

et al. 2018

ACS Omega

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An ultraviolet-enhanced (UV-enhanced) nitric oxide (NO) sensor based on silver-doped zinc oxide (ZnO) nanoflowers is developed using a low-cost hydrothermal method. The results indicate that silver (Ag) ions were doped into the ZnO nanostructure successfully, thus changing the morphology. In the high-resolution transmission electron microscopy images, we also found that some Ag ions were separated out onto the surface of the ZnO nanoflowers and that the Ag-doped and Ag nanoparticles improved the sensing property. The NO sensing property increased from 73.91 to 89.04% through the use of a UV light-emitting diode (UV-LED). The response time was approximately 120 s without the UV-LED, and the UV-enhanced Ag-doped ZnO nanoflower sensor exhibited a reduced response time (60 s). The best working temperature could be reduced from 200 to 150 °C using UV light illumination, and it was found that the NO response increased by 15.13% at 150 °C. The UV photoresponse of the Ag-doped ZnO nanoflowers and the mechanisms by which the improvement of NO sensing property occurred through the use of UV light illumination are discussed. The property of the gas sensor can be calibrated using a self-photoelectric effect under UV light illumination. These interesting UV-enhanced Ag-doped ZnO nanoflowers are viable candidates for practical applications.

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Morphology controlled syntheses of Cr doped ZnO single-crystal nanorods for acetone gas sensor

Cited by 44 publications

References 9 publications

Enhanced Carbon monoxide-sensing properties of Chromium-doped ZnO nanostructures

Enhanced Carbon monoxide-sensing properties of Chromium-doped ZnO nanostructures

ZnO Nanorods for Gas Sensors

High Sensitivity of NO Gas Sensors Based on Novel Ag-Doped ZnO Nanoflowers Enhanced with a UV Light-Emitting Diode

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