Synthesis of SnO<sub>2</sub>–ZnO core–shell nanofibers via a novel two-step process and their gas sensing properties

Choi, Sun-Woo; Park, Jae Young; Kim, Sang Sub

doi:10.1088/0957-4484/20/46/465603

Cited by 249 publications

(142 citation statements)

References 22 publications

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“…Such heterojunction effect improving the gas sensing performance has been experimentally demonstrated by various previous studies. [20][21][22][23][24][25][26][27][28] It is expected that the optimum pH condition of the LPD solution to maximize the sensing performances (i.e. the sensitivity and the response time) can be found through further investigation.…”

Section: Resultsmentioning

confidence: 99%

Localized Liquid-Phase Synthesis of Porous SnO₂ Nanotubes on MEMS Platform for Low-Power, High Performance Gas Sensors

Cho

Kang

Yang

et al. 2017

ACS Appl. Mater. Interfaces

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KEYWORDSmetal oxide, gas sensor, MEMS, tin oxide (SnO2), nanowire, nanotube, liquid phase deposition ABSTRACTWe have developed highly sensitive, low power gas sensors through the novel integration method of porous SnO2 nanotubes (NTs) on a micro-electro-mechanical-systems (MEMS) platform. As a template material, ZnO nanowires (NWs) were directly synthesized on beamshaped, suspended microheaters through in-situ localized hydrothermal reaction induced by 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 2 local thermal energy around the Joule-heated area. Also, liquid phase deposition (LPD) process enabled the formation of porous SnO2 thin film on the surface of ZnO NWs and simultaneous etching of ZnO core, eventually to generate porous SnO2 NTs. Due to the localized synthesis of SnO2 NTs on the suspended microheater, very low power for the gas sensor operation (< 6 mW) has been realized. Moreover, sensing performance (e.g. sensitivity and response time) of synthesized SnO2 NTs was dramatically enhanced compared to those of ZnO NWs. In addition, the sensing performance was further improved by forming SnO2-ZnO hybrid nanostructures due to the heterojunction effect.

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Section: Resultsmentioning

confidence: 99%

Localized Liquid-Phase Synthesis of Porous SnO₂ Nanotubes on MEMS Platform for Low-Power, High Performance Gas Sensors

Cho

Kang

Yang

et al. 2017

ACS Appl. Mater. Interfaces

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“…Because of the chemical stability and high gas response of SnO 2 with WO3 (Sharma et al, 2012;Yoon & Kim, 2011) and ZnO (S.-W. Choi, Park, & Kim, 2009;I.-S. Hwang et al, 2010;Liangyuan et al, 2008;Geyu Lu et al, 2012;J.-A. Park et al, 2010) towards NO x gases, they can be mixed together.…”

Section: Mixed Metal Oxides For No X Detectingmentioning

confidence: 99%

The Review of Semiconductor Gas Sensor for Nox Detcting

Niyat¹,

Hadi²,

Abadi³

2016

TOJDAC

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During the last century, many semiconductor gas sensors have been presented based on various materials and technologies to detect gas components. Many of them are made to support human's life in different ways. In the last years, the number of sensors which can detect various gas species has increased dramatically especially with respect to global issues of environment and earth atmosphere, the necessity of those gas sensors which can detect air pollutants such as NO x gases in environment is felt. They are essentially required in order to control the systems of combustion exhausted from industry, stationary facilities and automobiles. So it is necessary for the scientists to design and fabricate the gas sensors which are of low cost, selective, sensitive, and accurate especially in low level concentrations of target gases, easy to process and of high recovery and response time, good electrical properties, and above all tunable structure at the nano scale. In this sense, this paper has presented various classifications of gas sensors and various semiconductor oxides for NO x detecting and their technology to convey a comprehensive idea about the semiconductor metals as well as metal oxides for NO x detecting along with their characteristics, structures etc. in order to clarify the future road map towards on the semiconductor materials for NO x detecting. Keywords: sensor, NO x gases, semiconductor, metal oxides INTRODUCTIONIn the last few decades, many studies have been focused on the semiconducting metal oxides which are known as effective gas sensing materials especially for NO x detecting due to their electrical conductivities which are open to change greatly with the changes of atmosphere (K. J. Choi & Jang, 2010;Comini et al., 2009;Fine, Cavanagh, Afonja, & Binions, 2010;Franke, Koplin, & Simon, 2006; Kanan, El-Kadri, Abu-Yousef, & Kanan, 2009; G Korotcenkov & Cho, 2011;J.-H. Lee, 2009;Tricoli, Righettoni, & Teleki, 2010;Wetchakun et al., 2011). The sensing characteristics of such sensors can be optimized by controlling their morphology, surface to volume ratio, and electrical properties. The developments in nanotechnology, fabrication methods, and synthesis provide a suitable atmosphere to construct those sensors with their mentioned sensing characteristics easier.

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“…In their study, Al 2 O 3 was deposited on electrospun poly(vinyl alcohol) microfibers, which were then removed by calcination. This approach was followed by other researchers, who synthesized tubes of various sizes, materials (Al 2 O 3 [3,4], TiO 2 [5,6], ZnO [3,4,[7][8][9]), and structures (e.g. core-shell nanofibers) using different electrospun templates (nylon-6 [4], poly(vinyl acetate) [7][8][9], poly(vinyl alcohol) [3], poly(vinyl pyrrolidone) [5,6]).…”

Section: Introductionmentioning

confidence: 99%

Preparation of Al₂O₃ and AlN Nanotubes by Atomic Layer Deposition

et al. 2012

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Al 2 O 3 and AlN nanotubes were fabricated by depositing conformal thin films via atomic layer deposition (ALD) on electrospun nylon 66 (PA66) nanofiber templates. Depositions were carried out at 200°C, using trimethylaluminum (TMAl), water (H 2 O), and ammonia (NH 3 ) as the aluminum, oxygen, and nitrogen precursors, respectively. Deposition rates of Al 2 O 3 and AlN at this temperature were ~1.05 and 0.86 Å/cycle. After the depositions, Al 2 O 3 -and AlN-coated nanofibers were calcinated at 500°C for 2 h in order to remove organic components. Nanotubes were characterized by using X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). AlN nanotubes were polycrystalline as determined by high resolution TEM (HR-TEM) and selected area electron diffraction (SAED). TEM images of all the samples reported in this study indicated uniform wall thicknesses.

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Synthesis of SnO₂–ZnO core–shell nanofibers via a novel two-step process and their gas sensing properties

Cited by 249 publications

References 22 publications

Localized Liquid-Phase Synthesis of Porous SnO₂ Nanotubes on MEMS Platform for Low-Power, High Performance Gas Sensors

Localized Liquid-Phase Synthesis of Porous SnO₂ Nanotubes on MEMS Platform for Low-Power, High Performance Gas Sensors

The Review of Semiconductor Gas Sensor for Nox Detcting

Preparation of Al₂O₃ and AlN Nanotubes by Atomic Layer Deposition

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Synthesis of SnO2–ZnO core–shell nanofibers via a novel two-step process and their gas sensing properties

Cited by 249 publications

References 22 publications

Localized Liquid-Phase Synthesis of Porous SnO2 Nanotubes on MEMS Platform for Low-Power, High Performance Gas Sensors

Localized Liquid-Phase Synthesis of Porous SnO2 Nanotubes on MEMS Platform for Low-Power, High Performance Gas Sensors

The Review of Semiconductor Gas Sensor for Nox Detcting

Preparation of Al2O3 and AlN Nanotubes by Atomic Layer Deposition

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Product

Resources

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Synthesis of SnO₂–ZnO core–shell nanofibers via a novel two-step process and their gas sensing properties

Localized Liquid-Phase Synthesis of Porous SnO₂ Nanotubes on MEMS Platform for Low-Power, High Performance Gas Sensors

Localized Liquid-Phase Synthesis of Porous SnO₂ Nanotubes on MEMS Platform for Low-Power, High Performance Gas Sensors

Preparation of Al₂O₃ and AlN Nanotubes by Atomic Layer Deposition