High Performance Chemical Sensors Constructed by Noble Metal Nanoparticles Decorated ZnO Nanowires

Zhang, Yuan; Xiang, Qun; Xu, Jiaqiang

doi:10.1166/sl.2011.1475

Cited by 7 publications

(4 citation statements)

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“…However, the HCHO detection response of Sample 2, which had been modified with Ag, showed good HCHO response with detect limitation low to 100 ppb (health standard limitation) with response time near 12 s and recover time near 6 s. It may be suspected that the good HCHO response of Sample 2 at low temperature should be related to the high electro-conductivity of silver element, which will be discussed below. The HCHO gas-sensing performance of the Ag-modified In 2 O 3 /ZnO bundles is better than the reported various nanomaterials based conductometric HCHO gas sensors, such as ZnO microoctahedrons (detection limit of 200 ppm, response time of 46 s at 400 °C) [ 26 ], ZnO nanorods (detection limit of 10 ppm, response time of >15 min with UV assistance) [ 27 ], Pt nanoparticles decorated ZnO nanowires (detection limit of 1 ppm at 265 °C) [ 28 ], SnO 2 /In 2 O 3 nanofibers (detection limit of 10 ppm, response time of 3–5 min at 375 °C) [ 29 ], DC sputtered SnO 2 nanowires (detection limit of 5 ppm, response time of <2 min at 270 °C) [ 30 ], thermally evaporated SnO x -Sn compound films on graphene substrate (detection limit of 10 ppm) [ 31 ], Iizuka et al . synthesized SnO 2 porous film via plasma spray physical vapor deposition method.…”

Section: Resultsmentioning

confidence: 99%

Ag-Modified In2O3/ZnO Nanobundles with High Formaldehyde Gas-Sensing Performance

Fang

Bai

Song

et al. 2015

Sensors

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Ag-modified In2O3/ZnO bundles with micro/nano porous structures have been designed and synthesized with by hydrothermal method continuing with dehydration process. Each bundle consists of nanoparticles, where nanogaps of 10–30 nm are present between the nanoparticles, leading to a porous structure. This porous structure brings high surface area and fast gas diffusion, enhancing the gas sensitivity. Consequently, the HCHO gas-sensing performance of the Ag-modified In2O3/ZnO bundles have been tested, with the formaldehyde-detection limit of 100 ppb (parts per billion) and the response and recover times as short as 6 s and 3 s, respectively, at 300 °C and the detection limit of 100 ppb, response time of 12 s and recover times of 6 s at 100 °C. The HCHO sensing detect limitation matches the health standard limitation on the concentration of formaldehyde for indoor air. Moreover, the strategy to synthesize the nanobundles is just two-step heating and easy to scale up. Therefore, the Ag-modified In2O3/ZnO bundles are ready for industrialization and practical applications.

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Section: Resultsmentioning

confidence: 99%

Ag-Modified In2O3/ZnO Nanobundles with High Formaldehyde Gas-Sensing Performance

Fang

Bai

Song

et al. 2015

Sensors

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“…Gitae Namgung et al had studied an Al-doped ZnO nanowire, which showed a unique gas-sensitive property for NO 2 gas [17]. What's more, thanks to the catalytic effect of precious metals, appropriate addition of Au, Ag, Pt and other nanoparticles can promote the ionization of oxygen and improve the performance of the device [18][19][20][21][22]. On the other hand, changing the material morphology is an effective method so as to improve the performance.…”

Section: Introductionmentioning

confidence: 99%

Effect of Co-doping on the performance of nanosheet-like ZnO ethanol gas sensor

Wang

Huang

et al. 2021

J Mater Sci: Mater Electron

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In this paper, a hydrothermal method was applied to synthesize the nanosheetlike pure ZnO and 0.5%, 1 and 3% Co-doped ZnO (Co-ZnO). The pristine and Co-doped ZnO flower-like particles were assembled by porous nanosheets, with the uniform diameter about 18 lm. The N 2 -BET test found that Co doping significantly increased the specific surface area of the material which was conducive to gas diffusion and adsorption. HRTEM presented that 1% Co-ZnO nanosheets were composed of coral-like nanoparticles. The lattice distances 0.259 nm and 0.276 nm correspond to (002) and (100) crystal plane of ZnO. The gas sensing properties reveal that the 1% Co-doped ZnO present an outstanding enhanced sensitive performance comparing with pure ZnO to ethanol. To 100 ppm target gas, the response increased from 103 to 279.8 and the optimal operating temperature decreased from 369 to 348 °C, and the recovery time decreased from 40 to 18 s. The increased surface carrier concentration which promoted oxygen adsorption by Co was considered to be the key factor to improve the performance.

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“…Metal oxides decorated with metal nanoparticles have potentially important applications such as gas and vapor sensing, − hydrogen storage, electro-optics, and catalysis. − Methods used to deposit metal nanoparticles on metal oxides include in situ reduction of metal ions in solution, sputter or thermal deposition, laser ablation of microparticle aerosols, and “sol-flame synthesis” . With respect to catalysis, applications include using inert metal oxides as supports for catalytically active gold nanoparticles for reactions such as the oxidation of carbon monoxide and using metal nanoparticles to dope photocatalytically active metal oxides to enhance their photo-oxidative efficiency.…”

Section: Introductionmentioning

confidence: 99%

“…Introduction Metal oxides decorated with metal nanoparticles have potentially important applications such as gas and vapor sensing, [1][2][3][4][5][6][7][8][9][10][11][12][13][14] hydrogen storage, 15 electro-optics, 16 and catalysis. [17][18][19][20] Methods used to deposit metal nanoparticles on metal oxides include in-situ reduction of metal ions in solution, 2 sputter or thermal deposition, 21 laser ablation of microparticle aerosols, 22 and "solflame synthesis".…”

mentioning

confidence: 99%

Photocatalytic Activity and Fluorescence of Gold/Zinc Oxide Nanoparticles Formed by Dithiol Linking

et al. 2015

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Monolayer-protected gold nanoparticles (AuNPs) with average diameters of 2-4 nm have been covalently attached to zinc oxide nanorods using dithiol ligands. Electron microscopy and Raman spectroscopy show that ozone treatment or annealing at 300 or 450 °C increases the average diameter of the AuNPs to 6, 8, and 14 (±1) nm, respectively, and decomposes the organic layers to various degrees. These treatments locate the AuNPs closer to the nanorods. Heating and subsequent ozone exposure changes the color of the as-prepared nanocomposite powder from blue to purple due to oxidation of the outer layer of the AuNPs, and heating to 300 °C changes it to pink due to oxygen desorption. ZnO nanorods have a bimodal photoluminescence spectrum that consists of an ultraviolet excitonic peak and a visible, surface defect-related peak. Ozone treatment and annealing of the nanocomposite decreases the intensities of both peaks due to quenching by the AuNPs, but the visible peak is affected less. The photocatalytic efficiency of the nanocomposites toward oxidative degradation of rhodamine B has been measured and follows the order 300 °C > 450 °C > ozone treated ≈ as-prepared ≈ bare ZnO. The greater efficiency of the annealed samples likely arises from decreased electron-hole pair recombination rates.

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High Performance Chemical Sensors Constructed by Noble Metal Nanoparticles Decorated ZnO Nanowires

Cited by 7 publications

References 0 publications

Ag-Modified In2O3/ZnO Nanobundles with High Formaldehyde Gas-Sensing Performance

Ag-Modified In2O3/ZnO Nanobundles with High Formaldehyde Gas-Sensing Performance

Effect of Co-doping on the performance of nanosheet-like ZnO ethanol gas sensor

Photocatalytic Activity and Fluorescence of Gold/Zinc Oxide Nanoparticles Formed by Dithiol Linking

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