Ce-doped ZnO nanorods based low operation temperature NO2 gas sensors

Chang, Chi‐Jung; Lin, Chang-Yi; Chen, Jem-Kun; Hsu, Mu-Hsiang

doi:10.1016/j.ceramint.2014.03.080

Cited by 101 publications

(36 citation statements)

References 47 publications

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“…It is known that doping levels significantly affect the electrical properties of metal oxide films [27][28][29]. Therefore, we studied different doping levels (from 2M% to 8M%) in order to determine the optimum doping concentration to obtain better sensitivity of CuO films to artificial sweat.…”

Section: Electrical Characterizationmentioning

confidence: 99%

Highly improved hydration level sensing properties of copper oxide films with sodium and potassium doping

Şahin

Kaya

2016

Applied Surface Science

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In this study, un-doped, Na-doped, and K-doped nanostructured CuO films were successfully synthesized by the successive ionic layer adsorption and reaction (SILAR) technique and then characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD) and Currentvoltage (I-V) measurements. Structural properties of the CuO films were affected from doping.The XRD pattern indicates the formation of polycrystalline CuO films with no secondary phases.Furthermore, doping affected the crystal structure of the samples. The optimum conductivity values for both Na and K were obtained at 4M % doping concentrations. The comparative hydration level sensing properties of the un-doped, Na-doped, and K-doped CuO nanoparticles were also investigated. A significant enhancement in hydration level sensing properties was observed for both 4M % Na and K-doped CuO films for all concentration levels. Detailed discussions were reported in the study regarding atomic radii, crystalline structure, and conductivity.

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Section: Electrical Characterizationmentioning

confidence: 99%

Highly improved hydration level sensing properties of copper oxide films with sodium and potassium doping

Şahin

Kaya

2016

Applied Surface Science

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“…Doping of the metal oxide materials is an effective way to improve their functional properties as well as their sensing performance [20,32]. Hydrothermal synthesis is an effective manner for the preparation of Mn-and Al-doped ZnO nanorods [33,34].…”

Section: Synthesis Of Doped and Functionalized Zno Nanostructuresmentioning

confidence: 99%

“…In the first step, they prepared a ZnO seed layer on alumina substrates. Next, the samples were immersed in a solution consisting of Ce(NO 3 ) 3¨6 H 2 O, zinc nitrate hydrate, and hexamethylenetetramine [32]. In this case, it was possibnle to increase the diameter and the length of the nanorods by extending the growth time.…”

Section: Synthesis Of Doped and Functionalized Zno Nanostructuresmentioning

confidence: 99%

ZnO Quasi-1D Nanostructures: Synthesis, Modeling, and Properties for Applications in Conductometric Chemical Sensors

2016

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Abstract:One-dimensional metal oxide nanostructures such as nanowires, nanorods, nanotubes, and nanobelts gained great attention for applications in sensing devices. ZnO is one of the most studied oxides for sensing applications due to its unique physical and chemical properties. In this paper, we provide a review of the recent research activities focused on the synthesis and sensing properties of pure, doped, and functionalized ZnO quasi-one dimensional nanostructures. We describe the development prospects in the preparation methods and modifications of the surface structure of ZnO, and discuss its sensing mechanism. Next, we analyze the sensing properties of ZnO quasi-one dimensional nanostructures, and summarize perspectives concerning future research on their synthesis and applications in conductometric sensing devices.

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“…ZnO nanostructures such as nanosheets, nanorods, nanowires, nanotubes, and nanobelts are mostly utilized for gas sensing layers that operate at low temperatures. This is considered by the relation of their high surface to volume ratio, highly active center, along with other factors [12]. The application of ZnO nanostructures with respect to the detection of various gases such as NO 2 [5][6][7]12], CO [13], H 2 [14], and ethanol [15,16] has been widely investigated.…”

Section: Introductionmentioning

confidence: 99%

“…This is considered by the relation of their high surface to volume ratio, highly active center, along with other factors [12]. The application of ZnO nanostructures with respect to the detection of various gases such as NO 2 [5][6][7]12], CO [13], H 2 [14], and ethanol [15,16] has been widely investigated. Conversely, to effect a reduction of the operating temperature to room temperature, the application of metal oxide gas sensors with the assistance of UV light has been a mostly feasible approach [17,18].…”

Section: Introductionmentioning

confidence: 99%

Correlation between optical characteristics and NO2 gas sensing performance of ZnO nanorods under UV assistance

Thu¹,

Pham²,

Giang³

et al. 2018

VJSTE

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In this research, we present the ZnO nanorods synthesized through the simple route of the hydrothermal method. The ZnO nanorods were developed through the application of only zinc acetate Zn(CH3COO)2 and ammonia solution, NH4OH, in the hydrothermal process at 150oC for 10 hours. The size of the ZnO nanorods was defined as approximately 300 nm in diameter and 1-2 μm in length. The fabrication of sensors was achieved through drop-coating of synthesized ZnO nanorods on Al2O3 substrates integrated with Au electrodes. Subsequent to the process of sintering done at 500oC for different durations, ZnO nanorod-based sensors were investigated when exposed to NO2 gas (1.5, 2.5, and 5 ppm) at room temperature under continuous UV-LED (385 nm) illumination. The correlation between NO2 gas sensing performance and the optical property of the ZnO nanorods is discussed in detail. Herein, the defect concentration, particularly in the surface region of the ZnO nanorods could be modified through sintering, and this indicates its importance in the reduction of response-recovery times and enhancement of high sensitivity to NO2 gas.

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Ce-doped ZnO nanorods based low operation temperature NO2 gas sensors

Cited by 101 publications

References 47 publications

Highly improved hydration level sensing properties of copper oxide films with sodium and potassium doping

Highly improved hydration level sensing properties of copper oxide films with sodium and potassium doping

ZnO Quasi-1D Nanostructures: Synthesis, Modeling, and Properties for Applications in Conductometric Chemical Sensors

Correlation between optical characteristics and NO2 gas sensing performance of ZnO nanorods under UV assistance

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