Transport Phenomena and Conduction Mechanism of Individual Cross‐Junction SnO<sub>2</sub> Nanobelts

Guo, Zheng; Chen, Xing; Liu, Jinhuai; Huang, Xing‐Jiu

doi:10.1002/smll.201200672

Cited by 6 publications

(3 citation statements)

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“…4 It has been reported that a downward bending of 0.1 eV could be observed for water adsorption on stoichiometric SnO 2 (110) surfaces. 24,25 Electron transfer through junction barriers is the dominant mechanism during electron transport within the nanowire network 3,15 (due to the high electron mobility in individual nanowire, the conducting path within a nanowire can be treated as a "short circuit" between the barriers at the nanojunctions) and reduction of the energy barrier will result in a signicant increase of the amount of free carriers owing within the nanonet. Thus the exposure of the nanowire network devices to the humid air results in a reduced electron injection barrier at the nanowire junctions, resulting in a highly conducting pathway.…”

Section: Resultsmentioning

confidence: 99%

The role of tin oxide surface defects in determining nanonet FET response to humidity and photoexcitation

et al. 2014

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There has been a growing interest in 1-D metal oxide semiconducting nanostructures due to their stable chemical properties and potential applications in large-area, low-cost and flexible substrates. In this current work, we used field effect transistors (FETs) built on sub-millimetre scale metal oxide nanonet to characterize the nanowire surface properties. Two variations of SnO 2 nanowires, denoted as 0% O 2 and 0.5% O 2 -Ar, were grown by changing the O 2 concentration in the growth atmosphere. HR-TEM images exhibit two dissimilar surface morphologies which represent diverse surface-defect levels. While the devices showed very little semiconducting behaviour in humid air, the flow in the dry air decreased the density of free carriers dramatically. Both water vapour and oxygen were observed to contribute to the hysteresis of transfer curves. Under white light illumination, 0% O 2 nanonet devices exhibited a significant photocurrent response in the controlled environment while almost no changes were observed for 0.5% O 2 ones. These results confirmed the significant role of surface defects in metal-oxide nanowires and implied great potential for SnO 2 nanonet FETs in the application of water gas sensors and photodetectors.

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Section: Resultsmentioning

confidence: 99%

The role of tin oxide surface defects in determining nanonet FET response to humidity and photoexcitation

et al. 2014

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“…For copper selenide, its reported nanostructures are dominated by nanocrystals, nanowires, nanoflakes, and so forth. − To the best of our investigation, their belt-/ribbonlike nanostructures with a rectangular cross section have not been involved until now. Concerning copper oxide, its belt-/ribbonlike nanostructures have been only demonstrated in a few reports. − However, its porous nanobelts have been rarely developed to fabricate nanosensors. , In fact, beltlike nanomaterials, first reported by Wang et al, have aroused great interest because of their promising building-block function for nanoelectronics, optoelectronics, and nanosensors. − Beltlike nanomaterials being endowed with porous structure, their intrinsic characteristics especially for gas-sensing performances are further enhanced, which is attributed to higher active surface-to-volume ratios and more channels for gas diffusion in contrast to solid nanobelts. , Accordingly, development of new synthetic strategies of porous copper selenide and copper oxide nanobelts will not only enrich current copper-based nanostructures, but also further widen their potential applications.…”

Section: Introductionmentioning

confidence: 99%

Cation-Exchange Synthesis of Cu₂Se Nanobelts and Thermal Conversion to Porous CuO Nanobelts with Highly Selective Sensing toward H₂S

Guo

et al. 2017

ACS Appl. Nano Mater.

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Cu 2 Se nanobelts have been developed via a facile cation-exchange approach at room temperature, employing ZnSe•0.5N 2 H 4 hybrid nanobelts as the templated precursors. Detailed characterizations demonstrate that the morphologies of the templated precursors are well-preserved in the cation-exchange reaction, because of the spatial confinement effect from the coated layer of poly-(vinylpyrrolidone) (PVP) surfactant. Simultaneously, Cu 2+ cations diffusing through the coated layer of PVP are in situ reduced to be Cu + cations by the ligands of N 2 H 4 , thereby forming Cu 2 Se nanobelts with the complete replacement of Zn 2+ cations in the templated precursors. After thermal oxidation in air, the obtained Cu 2 Se nanobelts are further converted into porous CuO nanobelts. Considering that this special morphology processes a large active surface area and is favorable for gas diffusion, gas-sensing properties of porous CuO nanobelts have been explored. The results indicate that porous CuO nanobelts exhibit highly selective sensing toward H 2 S with a low detection limit less than 10 ppb. Moreover, they also present a good sensing reproducibility. Finally, their sensing mechanism toward H 2 S has been discussed.

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“…Due to the large active surface area, nanostructured semiconductor metal oxides have been received great attention in many fields, especially for gas sensors. − Over the past several decades, considerable efforts have been devoted to preparing their various nanostructures, such as nanoparticles, nanowires, nanorods, nanobelts and nanotubes, and so forth. − By employing these nanostructures as sensing units, indeed their gas-sensing performances have been greatly enhanced in contrast to the bulk structures. However, not all nanostructures can effectively contribute to the gas-sensing response among the sensing films composed of them.…”

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Hierarchical Morphology-Dependent Gas-Sensing Performances of Three-Dimensional SnO₂ Nanostructures

Guo

et al. 2016

ACS Sens.

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Hierarchical morphology-dependent gas-sensing performances have been demonstrated for three-dimensional SnO nanostructures. First, hierarchical SnO nanostructures assembled with ultrathin shuttle-shaped nanosheets have been synthesized via a facile and one-step hydrothermal approach. Due to thermal instability of hierarchical nanosheets, they are gradually shrunk into cone-shaped nanostructures and finally deduced into rod-shaped ones under a thermal treatment. Given the intrinsic advantages of three-dimensional hierarchical nanostructures, their gas-sensing properties have been further explored. The results indicate that their sensing behaviors are greatly related with their hierarchical morphologies. Among the achieved hierarchical morphologies, three-dimensional cone-shaped hierarchical SnO nanostructures display the highest relative response up to about 175 toward 100 ppm of acetone as an example. Furthermore, they also exhibit good sensing responses toward other typical volatile organic compounds (VOCs). Microstructured analyses suggest that these results are mainly ascribed to the formation of more active surface defects and mismatches for the cone-shaped hierarchical nanostructures during the process of thermal recrystallization. Promisingly, this surface-engineering strategy can be extended to prepare other three-dimensional metal oxide hierarchical nanostructures with good gas-sensing performances.

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Transport Phenomena and Conduction Mechanism of Individual Cross‐Junction SnO₂ Nanobelts

Cited by 6 publications

References 42 publications

The role of tin oxide surface defects in determining nanonet FET response to humidity and photoexcitation

The role of tin oxide surface defects in determining nanonet FET response to humidity and photoexcitation

Cation-Exchange Synthesis of Cu₂Se Nanobelts and Thermal Conversion to Porous CuO Nanobelts with Highly Selective Sensing toward H₂S

Hierarchical Morphology-Dependent Gas-Sensing Performances of Three-Dimensional SnO₂ Nanostructures

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Transport Phenomena and Conduction Mechanism of Individual Cross‐Junction SnO2 Nanobelts

Cited by 6 publications

References 42 publications

The role of tin oxide surface defects in determining nanonet FET response to humidity and photoexcitation

The role of tin oxide surface defects in determining nanonet FET response to humidity and photoexcitation

Cation-Exchange Synthesis of Cu2Se Nanobelts and Thermal Conversion to Porous CuO Nanobelts with Highly Selective Sensing toward H2S

Hierarchical Morphology-Dependent Gas-Sensing Performances of Three-Dimensional SnO2 Nanostructures

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Transport Phenomena and Conduction Mechanism of Individual Cross‐Junction SnO₂ Nanobelts

Cation-Exchange Synthesis of Cu₂Se Nanobelts and Thermal Conversion to Porous CuO Nanobelts with Highly Selective Sensing toward H₂S

Hierarchical Morphology-Dependent Gas-Sensing Performances of Three-Dimensional SnO₂ Nanostructures