Size-dependent response of single-nanowire gas sensors

Tonezzer, Matteo; Hiếu, Nguyễn Văn

doi:10.1016/j.snb.2012.01.022

Cited by 115 publications

(65 citation statements)

References 37 publications

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“…For film thicknesses <2.6 nm, the response decrease was attributed to the increasing resistance of the SnO x ALD film. Similar observations were found for single nanowire sensors with diameter 40 nm, close to the depletion zone depth (13.4 nm) calculated for NO 2 adsorbed on SnO 2 , which had higher response to NO 2 compared to wires with larger diameters (between 62 and 117 nm) [57]. This is similar to the results found previously for ZnO nanowires [38], although the rationale provided is different (increased defect density for ZnO and Debye length for SnO 2 ).…”

Section: Tin Oxidesupporting

confidence: 89%

“…The most common precursors for the synthesis of SnO 2 via CVD include metallic tin [56][57][58] often used as a reactive carrier gas. SnO 2 films have often been tested without being integrated into traditional gas sensing devices whereas SnO 2 in the form of NPs and NS have been directly integrated with planar ceramic-platforms.…”

Section: Tin Oxidementioning

confidence: 99%

“…Thinner nanowires also showed an improved detection limit to NO 2 ( Figure 7). Reprinted from [57] with permission from Elsevier.…”

Section: Tin Oxidementioning

confidence: 99%

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Chemical Vapour Deposition of Gas Sensitive Metal Oxides

et al. 2016

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This article presents a review of recent research efforts and developments for the fabrication of metal-oxide gas sensors using chemical vapour deposition (CVD), presenting its potential advantages as a materials synthesis technique for gas sensors along with a discussion of their sensing performance. Thin films typically have poorer gas sensing performance compared to traditional screen printed equivalents, attributed to reduced porosity, but the ability to integrate materials directly with the sensor platform provides important process benefits compared to competing synthetic techniques. We conclude that these advantages are likely to drive increased interest in the use of CVD for gas sensor materials over the next decade, whilst the ability to manipulate deposition conditions to alter microstructure can help mitigate the potentially reduced performance in thin films, hence the current prospects for use of CVD in this field look excellent.

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Section: Tin Oxidesupporting

confidence: 89%

Section: Tin Oxidementioning

confidence: 99%

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Chemical Vapour Deposition of Gas Sensitive Metal Oxides

et al. 2016

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“…In particular, one-dimensional semiconductor nanostructures, such as nanobelt, nanowire and nanotube, due to their unique physical and chemical properties caused by their nanometer size effect, have aroused great interest due to their unique characteristics [3] [4] [5] [6] [7]. Therefore, metal-oxide semiconductor nanostructured materials, such as SnO 2 , In 2 O 3 , WO 3 and ZnO, have been widely manufactured as sensors for de-tecting air composition and organic or poisonous gases due to low cost, easy accessibility, high performance, and reliable stability [8] [9] [10] [11].…”

Section: Introductionmentioning

confidence: 99%

Influence of Mn Doping on the Sensing Properties of SnO<sub>2</sub> Nanobelt to Ethanol

Huang¹,

Liu²,

Wu³

et al. 2017

AJAC

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Mn doped SnO 2 nanobelts (Mn:SnO 2 NBs) and pure SnO 2 nanobelts (SnO 2 NBs) were synthesized by thermal evaporation technique at 1355˚C with Ar carrier gas (25 sccm, 150 Torr). The SEM, EDS, XRD, TEM, HRTEM, SAED, XPS, UV-Vis techniques were used to characterize the attained samples. The band gap of Mn doped SnO 2 NBs by UV-Vis was measured to be 3.43 eV at room temperature, lower than that of the pure counterpart with ~3.66 eV. Mn:SnO 2 NB and pure SnO 2 NB sensors were developed. It is found that Mn:SnO 2 NB device exhibits a higher sensitivity with 62.12% to 100 ppm of ethanol at 210˚C, which is the highest sensitivity among the three tested VOC gases (ethanol, ethanediol, and acetone). The theoretical detection limit for ethanol of the sensor is 1.1 ppm. The higher response is related to the selective catalysis of the doped Mn ions.

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“…The sensing mechanism of SnO 2 is categorized as surface-control type, in which the grain sizes, surface states, and oxygen adsorption quantities have important roles in gas sensing [3]. Nanostructured SnO 2 is eliciting increasing research attention because its properties could more significantly improve from nanometer size effects compared with its bulk material [4,5].…”

Section: Introductionmentioning

confidence: 99%