High-performance NO2 gas sensor based on ZnO nanorod grown by ultrasonic irradiation

Oh, Eunseok; Choi, Ho-Yun; Jung, Seung-Ho; Cho, Seungho; Kim, Jae Chang; Lee, Kun‐Hong; Kang, Sang‐Woo; Kim, Jintae; Yun, Ju‐Young; Jeong, Soo‐Hwan

doi:10.1016/j.snb.2009.06.031

Cited by 192 publications

(92 citation statements)

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“…10 The bottom electrodes are best fabricated first and then the ZnO nanostructures are grown between the electrodes on-chip for gas measurement. [11][12][13] Recently, ZnO nanowires have been selectively grown between Pt electrodes by CVD on discrete Au islands and used for gas sensing of NO 2 and ethanol. 14 Recently, we successfully grew ZnO nanorods via the hydrothermal method on-chip at 85°C and found that the nanorods have good sensitivity and selectivity to NO 2 .…”

Section: Introductionmentioning

confidence: 99%

Comparison of NO2 Gas-Sensing Properties of Three Different ZnO Nanostructures Synthesized by On-Chip Low-Temperature Hydrothermal Growth

Jiao

Duy

Trung

et al. 2017

Journal of Elec Materi

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Three different ZnO nanostructures, dense nanorods, dense nanowires, and sparse nanowires, were synthesized between Pt electrodes by on-chip hydrothermal growth at 90°C and below. The three nanostructures were characterized by scanning electron microscopy and x-ray diffraction to identify their morphologies and crystal structures. The three ZnO nanostructures were confirmed to have the same crystal type, but their dimensions and densities differed. The NO 2 gas-sensing performance of the three ZnO nanostructures was investigated at different operation temperatures. ZnO nanorods had the lowest response to NO 2 along with the longest response/recovery time, whereas sparse ZnO nanowires had the highest response to NO 2 and the shortest response/recovery time. Sparse ZnO nanowires also performed best at 300°C and still work well and fast at 200°C. The current-voltage curves of the three ZnO nanostructures were obtained at various temperatures, and the results clearly showed that sparse ZnO nanowires did not have the linear characteristics of the others. Analysis of this phenomenon in connection with the highly sensitive behavior of sparse ZnO nanowires is also presented.

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Section: Introductionmentioning

confidence: 99%

Comparison of NO2 Gas-Sensing Properties of Three Different ZnO Nanostructures Synthesized by On-Chip Low-Temperature Hydrothermal Growth

Jiao

Duy

Trung

et al. 2017

Journal of Elec Materi

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“…Nano metal oxide based NO x gas sensors constituent promising candidates for realistic application in this regard due to advantages such as extremely low detecting level (even up to ppb), high resolution, and fast response. For example, the gas sensors that utilized metal oxides, such as WO 3 [2][3][4], ZnO [5][6][7], among others, were found to exhibit an extremely high sensing performance to NO 2 gas. However, the metal oxide based gas sensors usually operate at high temperatures, and subsequently, become unstable or less reliable due to the changing particle size and morphology structure [8].…”

Section: Introductionmentioning

confidence: 99%

“…Zinc oxide semiconductors with large band gaps (E g = 3.37 eV) have been applied in many fields such as gas sensors [2][3][4][5][6][7], photovoltaic devices [9], optoelectronic devices [10], solar cells [11], among others. ZnO nanostructures such as nanosheets, nanorods, nanowires, nanotubes, and nanobelts are mostly utilized for gas sensing layers that operate at low temperatures.…”

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%

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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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“…Ø˜ZnOÕ SnO 2 ¬ ŸÁ-Ø∂∫ ◊°¨∫°∫ ˆ°πÃ ÁÎ«Ì ÷Ÿ [6,7]. °∫ ae≠« ˆ…¬ª‚Û√∞¬Ê˝∏OE°∫Õ«¢ÀÈ˚ªı°√ ∞‚ ßÿ ˆ∞˙« ©‚ ¶ ™Î ©‚OE ŸÃ¬ Õ˙ø√°™ ÎOEÂ, ™ÎÕÃÓ, ™Î∏, ™Îμ Ó« ∏∂°˚Û ˆμ‚ ª Ì¡oe© '∫Ê˝°Î-ŸÁ-¨∏°¯ ‡«Ì ÷Ÿ [8][9][10][11]. ˆ∞˙« '∫ªß-Ê˝∏OE ß¸˝, π-÷ '∫˝, ˆ≠≥AE Ó«£‹-'∫Ê˝Ã˚Î«˙∏Á, '∫∞˙° Ωƒ ¶÷ ‚˚∏OE¯fioe© Ωƒ ¶ fi∫ ∞˙« π"OEß∏° ˆ ¶ fi Δ˙¬Û¬°≠≠-≠-›¿ªoe∏∞¬ Ωƒ≥AEÊ˝Ã÷ Ÿ [12][13][14].…”

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The Characteristics of ZnO/SnO₂Sensing Materials by Ultrasonic and Hydrothermal Treatments to Volatile Organic Compounds

Yu¹,

Do²,

Byun³

et al. 2012

Journal of Sensor Science and Technology

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The important factors in sensors are sensitivity, selectivity, and response time. Oxide semiconductors are high sensitivity, fast response and the advantage of miniaturization. Zn-doped SnO 2 materials have been synthesized in order to improve the selectivity of the sensor. ZnO/ SnO 2 crystals were prepared by a simple hydrothermal process and ultrasound pretreated hydrothermal process. ZnO Received : Oct. 12, 2012, Revised : Nov. 9, 2012, Accepted : Nov. 19, 2012 This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License(http://creativecommons.org/licenses/bync/3.0)which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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High-performance NO2 gas sensor based on ZnO nanorod grown by ultrasonic irradiation

Cited by 192 publications

References 20 publications

Comparison of NO2 Gas-Sensing Properties of Three Different ZnO Nanostructures Synthesized by On-Chip Low-Temperature Hydrothermal Growth

Comparison of NO2 Gas-Sensing Properties of Three Different ZnO Nanostructures Synthesized by On-Chip Low-Temperature Hydrothermal Growth

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

The Characteristics of ZnO/SnO₂Sensing Materials by Ultrasonic and Hydrothermal Treatments to Volatile Organic Compounds

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High-performance NO2 gas sensor based on ZnO nanorod grown by ultrasonic irradiation

Cited by 192 publications

References 20 publications

Comparison of NO2 Gas-Sensing Properties of Three Different ZnO Nanostructures Synthesized by On-Chip Low-Temperature Hydrothermal Growth

Comparison of NO2 Gas-Sensing Properties of Three Different ZnO Nanostructures Synthesized by On-Chip Low-Temperature Hydrothermal Growth

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

The Characteristics of ZnO/SnO2Sensing Materials by Ultrasonic and Hydrothermal Treatments to Volatile Organic Compounds

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The Characteristics of ZnO/SnO₂Sensing Materials by Ultrasonic and Hydrothermal Treatments to Volatile Organic Compounds