Controllable synthesis of ultrathin WO3 nanotubes and nanowires with excellent gas sensing performance

Zeb, Shah; Peng, Xiujing; Yuan, Guangzheng; Zhao, Xiuxian; Qin, Chao; Sun, Guoxin; Nie, Yong; Cui, Yu; Jiang, Xuchuan

doi:10.1016/j.snb.2019.127435

Cited by 52 publications

(27 citation statements)

References 50 publications

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“…Therefore, the changes in resistance and conductivity of a NW can be manifested [ 73 , 74 , 75 , 76 ]. The sensing mechanism of the acetone sensor is demonstrated in Figure 5 d [ 77 ]. Acetone or ethanol react with surface oxygen species and release electrons back into the conduction band of the nanostructure based on the following equations: O 2 (g) → O 2 (ads), O 2 (ads) + e − → O 2 − (ads), O 2 − (ads) + e − → 2O − (ads), C 3 H 6 O(g) + 8O − (ads) → 3CO 2 + 3H 2 O + 8e − , C 2 H 5 O + 6O − (ads) → 2CO 2 + 3H 2 O(g) + 6e − , as a biosensor, the key point is the functionalization through the attachment of identification elements, which can be coupled with target analytes.…”

Section: Device Mechanismsmentioning

confidence: 99%

“… ( a ) Ion current response to the translocation of non-folded (black), partially folded (red), and fully folded (blue) DNA through a graphene nanopore [ 69 ]; ( b ) schematic illustration of the ionic distribution of counterions and co-ions in a nanotube with a DNA strand [ 70 ]; ( c ) schematic illustration of the current responses under different ion concentrations due to charge effect and blockade effect [ 70 ]; ( d ) schematic illustration of h-WO 3 nanotubes detecting acetone gas [ 77 ]; ( e ) the transistor transfer function (TTF) spectrums of the original ( left ) and after biomolecule combined ( right ) devices. The inset shows the simplified model of the input impedance of the device, which can be described as an Resistor-Capacitance element (R Bio and C Bio ) of biomolecule layer in series with the gate oxide capacitance C Ox [ 59 ]; ( f ) Schematic illustration of the attachment layers of single-stranded and double-stranded DNA molecules on the SiNW.…”

Section: Device Mechanismsmentioning

confidence: 99%

“…As illustrated in Table 1 , WO 3 nanostructures have proved to be efficient materials for ethanol detection [ 87 ]. Different structural morphologies such as WO 3−x nanowires, h-WO 3 nanowires, h-WO 3 nanorods and h-WO 3 nanotubes have also been prepared and tested [ 77 ]. As shown in Figure 7 a,b, a relatively high sensitivity to acetone and ethanol have been observed in h-WO 3 nanotubes (Ra/Rg = 32 and 26, respectively).…”

Section: Device Applications For Chemical and Bio-sensingmentioning

confidence: 99%

“… The response (R a /R g ) of WO 3−x nanowire, h-WO 3 nanotube, h-WO 3 nanowire and h-WO 3 nanorod versus acetone ( a ) and ethanol ( b ) concentration [ 77 ]; ( c ) the response of porous unloaded-In 2 O 3 , porous Pd–In 2 O 3 and Pd–In 2 O 3 NW-like network under different temperatures to 5 ppm NO 2 [ 90 ]; ( d ) the response and recovery times of three samples to 5 ppm NO 2 at 110, 170 and 210 °C [ 90 ]. …”

Section: Figurementioning

confidence: 99%

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Novel Nanofluidic Cells Based on Nanowires and Nanotubes for Advanced Chemical and Bio-Sensing Applications

Zhu

Wang

et al. 2021

Nanomaterials

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Since the first introduction of one-dimensional nanochannels for single-molecule detection, there has been increasing interest in modern nanofluidic systems, such as chemical and biological sensing applications. Recently developed nanowires (NWs) and nanotubes (NTs) have received tremendous attention due to their unique geometrical, physical and chemical properties, which are very attractive in this field. Here, we review the recent research activities in the field of novel nanofluidic cells based on NWs and NTs. First, we give a brief introduction of this field. Then the common synthesis methods of NWs and NTs are summarized. After that, we discuss the working principle and sensing mechanism of nanofluidic devices, which is fundamental to the interaction between these nanostructures and small molecules. Finally, we present the NW- and NT-based devices for chemical and bio-sensing applications, such as gas sensing, pathogen detection, DNA sequencing, and so forth.

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Section: Device Mechanismsmentioning

confidence: 99%

Section: Device Mechanismsmentioning

confidence: 99%

Section: Device Applications For Chemical and Bio-sensingmentioning

confidence: 99%

Section: Figurementioning

confidence: 99%

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Novel Nanofluidic Cells Based on Nanowires and Nanotubes for Advanced Chemical and Bio-Sensing Applications

Zhu

Wang

et al. 2021

Nanomaterials

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“…The gas-sensing performances of the prepared samples including sensitivity, selectivity and stability were comprehensively investigated under light emitting diode (LED) light illumination, and the influences of operating temperature and relative humidity (RH) on the analysis of acetone content were discussed. The response was improved, and the optimal operating temperature was lower than the pure WO 3 sensor [28][29][30]. Fe-doped WO 3 phase junctions exhibited excellent linearity at 90% RH atmosphere under LED illumination.…”

Section: Introductionmentioning

confidence: 98%

Enhanced Photo-Assisted Acetone Gas Sensor and Efficient Photocatalytic Degradation Using Fe-Doped Hexagonal and Monoclinic WO3 Phase−Junction

et al. 2020

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The development of WO3-based gas sensors for analysis of acetone in exhaled breath is significant for noninvasive diagnosis of diabetes. A series of Fe-doped hexagonal and monoclinic WO3 phase−junction (Fe−h/m−WO3) sensors were synthesized by the hydrothermal calcination method, and the influences of operating temperature and light irradiation on the response were studied. Under light emitting diode (LED) illumination, Fe−h/m−WO3 exhibited higher responses to acetone than those of the undoped WO3-based sensors at an operating temperature of 260 °C with 90% relative humidity, and good linearity between response and acetone concentration (0.5 to 2.5 ppm) was achieved under the 90% relative humidity condition. Meanwhile, the optimal Fe−h/m−WO3 sensor exhibited high selectivity and stability for a duration of three months. The excellent sensing performance of Fe−h/m−WO3 was attributed to the formation of phase−junction and Fe doping, and these were beneficial for the separation of photon−generated carriers and oxygen adsorption on the WO3 surface, promoting the generation of superoxide radicals, which was demonstrated by electron paramagnetic resonance and photocurrent tests. Additionally, the Fe−doped WO3 phase−junction sample also showed good photocatalytic performance for rhodamine B degradation. This study may provide some insights into rational design of new types of gas sensors and offer an alternative for noninvasive diagnosis of diabetes.

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An All‐Printed, Fast‐Response Flexible Humidity Sensor Based on Hexagonal‐WO₃ Nanowires for Multifunctional Applications

et al. 2023

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The utilization of printing techniques for the development of high‐performance humidity sensors holds immense significance for various applications in the fields of Internet of Things, agriculture, human healthcare, and storage environments. However, the long response time and low sensitivity of current printed humidity sensors limited their practical applications. Herein, a series of high‐sensing performance flexible resistive‐type humidity sensors are fabricated by the screen‐printing method, and the hexagonal tungsten oxide (h‐WO3) is employed as the humidity sensing material due to its low cost, strong chemical adsorption ability, and excellent humidity sensing ability. The as‐prepared printed sensors exhibit high sensitivity, good repeatability, outstanding flexibility, low hysteresis, and fast response (1.5 s) in a wide relative humidity (RH) range (11‐95% RH). Furthermore, the sensitivity of humidity sensors can be easily adjusted by altering the manufacturing parameters of the sensing layer and interdigital electrode to meet the diverse requirements of specific applications. The printed flexible humidity sensors possess immense potential in various applications, including wearable devices, non‐contact measurements, and packaging opening state monitoring.This article is protected by copyright. All rights reserved

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Controllable synthesis of ultrathin WO3 nanotubes and nanowires with excellent gas sensing performance

Cited by 52 publications

References 50 publications

Novel Nanofluidic Cells Based on Nanowires and Nanotubes for Advanced Chemical and Bio-Sensing Applications

Novel Nanofluidic Cells Based on Nanowires and Nanotubes for Advanced Chemical and Bio-Sensing Applications

Enhanced Photo-Assisted Acetone Gas Sensor and Efficient Photocatalytic Degradation Using Fe-Doped Hexagonal and Monoclinic WO3 Phase−Junction

An All‐Printed, Fast‐Response Flexible Humidity Sensor Based on Hexagonal‐WO₃ Nanowires for Multifunctional Applications

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Controllable synthesis of ultrathin WO3 nanotubes and nanowires with excellent gas sensing performance

Cited by 52 publications

References 50 publications

Novel Nanofluidic Cells Based on Nanowires and Nanotubes for Advanced Chemical and Bio-Sensing Applications

Novel Nanofluidic Cells Based on Nanowires and Nanotubes for Advanced Chemical and Bio-Sensing Applications

Enhanced Photo-Assisted Acetone Gas Sensor and Efficient Photocatalytic Degradation Using Fe-Doped Hexagonal and Monoclinic WO3 Phase−Junction

An All‐Printed, Fast‐Response Flexible Humidity Sensor Based on Hexagonal‐WO3 Nanowires for Multifunctional Applications

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Product

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About

An All‐Printed, Fast‐Response Flexible Humidity Sensor Based on Hexagonal‐WO₃ Nanowires for Multifunctional Applications