Sensors: Pt Nanoparticles Sensitized Ordered Mesoporous WO<sub>3</sub> Semiconductor: Gas Sensing Performance and Mechanism Study (Adv. Funct. Mater. 6/2018)

Ren, Yuan; Zhou, Xinran; Liu, Liangliang; Zhu, Yongheng; Cheng, Xiaowei; Xu, Pengcheng; Li, Xinxin; Deng, Yonghui; Zhao, Dongyuan

doi:10.1002/adfm.201870040

Cited by 19 publications

(23 citation statements)

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“…A concentration of nitric oxide higher than 30 parts per billion (ppb) in exhaled breath indicates possible presence of asthma caused by inflammation in the human respiratory system . In this regard, much effort has been directed toward the development of devices for gas detection, including chemoresistive sensors based on semiconductors, electrochemical sensing devices, chromatography, infrared spectroscopy, and colorimetric sensors . These devices are frequently complex structures with large size and high cost.…”

mentioning

confidence: 99%

Exhaling‐Driven Hydroelectric Nanogenerators for Stand‐Alone Nonmechanical Breath Analyzing

Shen

Xiao

Zou

et al. 2019

Adv Materials Technologies

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The analysis of exhaled breath is an increasingly important role in the provision of security and in the management of personal healthcare. The development of self‐powered, reliable, miniature low cost and noninvasive devices is fundamental to practical applications. However, most state‐of‐the‐art self‐powered systems are incorporating mechanical nanogenerators, which would promote contact failures of electronics and limit minimization of the monitoring system. This work outlines a new solution to this problem based on a self‐powered breath analyzer integrated with a hydroelectric nanogenerator (HENG), in which the nanogenerator extracts electrical power from biochemical energy. The output signal from the sensor in this device is highly sensitive to the concentration of ethanol exhaled in breath down to low detection limitation of 50 ppm. A high dynamic range is observed whereby a signal response of ≈80% relative to peak value is obtained under the exposure to gas containing 100 ppm of ethanol. Unlike conventional self‐powered breathing analyzers based on piezoelectric or triboelectric nanogenerators, mechanical vibrations are eliminated. The availability of this compact breath analyzer provides a new detection regime for gas sensing, and should facilitate the design of a wide range of self‐powered systems incorporated in the next generation of innovative electronic devices.

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confidence: 99%

Exhaling‐Driven Hydroelectric Nanogenerators for Stand‐Alone Nonmechanical Breath Analyzing

Shen

Xiao

Zou

et al. 2019

Adv Materials Technologies

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“…These results confirm the great advantage of DM‐PG nanosheets for gas sensors, owing to hierarchical ordered dual‐mesoporous structure for boosting carrier transfer. [ 46–48 ] The selectivity of DM‐PG nanosheets were further examined upon NH 3 of 40 ppm and other volatile organic compounds and water of 500 ppm, including ethanol, methanol, acetone, acetonitrile, chlorobenzene, ethyl acetate, toluene, and tetrachloromethane (Figure 3c). Remarkably, the response value of DM‐PG based sensor is as high as ≈56%, at least 29 times higher than those of other interfering gases even with higher concentrations, indicative of exceptional selectivity of DM‐PG nanosheets toward NH 3 .…”

Section: Resultsmentioning

confidence: 99%

Hierarchical Ordered Dual‐Mesoporous Polypyrrole/Graphene Nanosheets as Bi‐Functional Active Materials for High‐Performance Planar Integrated System of Micro‐Supercapacitor and Gas Sensor

Qin

Gao

Shi

et al. 2020

Adv Funct Materials

128

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(1 of 9)Planar integrated systems of micro-supercapacitors (MSCs) and sensors are of profound importance for 3C electronics, but usually appear poor in compatibility due to the complex connections of device units with multiple mono-functional materials. Herein, 2D hierarchical ordered dual-mesoporous polypyrrole/graphene (DM-PG) nanosheets are developed as bi-functional active materials for a novel prototype planar integrated system of MSC and NH 3 sensor. Owing to effective coupling of conductive graphene and highsensitive pseudocapacitive polypyrrole, well-defined dual-mesopores of ≈7 and ≈18 nm, hierarchical mesoporous network, and large surface area of 112 m 2 g −1 , the resultant DM-PG nanosheets exhibit extraordinary sensing response to NH 3 as low as 200 ppb, exceptional selectivity toward NH 3 that is much higher than other volatile organic compounds, and outstanding capacitance of 376 F g −1 at 1 mV s −1 for supercapacitors, simultaneously surpassing single-mesoporous and non-mesoporous counterparts. Importantly, the bi-functional DM-PG-based MSC-sensor integrated system represents rapid and stable response exposed to 10-40 ppm of NH 3 after only charging for 100 s, remarkable sensitivity of NH 3 detection that is close to DM-PG-based MSC-free sensor, impressive flexibility with ≈82% of initial response value even at 180°, and enhanced overall compatibility, thereby holding great promise for ultrathin, miniaturized, body-attachable, and portable detection of NH 3 .

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“…Liu et al functionalized WO 3 nanorods with Pt nanoparticles via one‐pot chemical synthesis route and found it selective toward alcohols with several fold performance enhancement as compared to the undecorated WO 3 nanorods at an operating temperature of 220 °C 190. Ma et al synthesized Pt‐sensitized mesoporous WO 3 crystalline framework through the simultaneous coassembly of amphiphilic poly (ethylene oxide)‐ b ‐polystyrene, hydrophobic platinum precursors, and hydrophilic tungsten precursors 191. The device showed excellent sensitivity for CO gas in concentration range of 100–500 ppm at an optimal temperature of 125 °C, at a humidity level of 60% RH.…”

Section: Efforts To Improve Performance Of Devices Based On These Matmentioning

confidence: 99%

Recent Progress in Chemiresistive Gas Sensing Technology Based on Molybdenum and Tungsten Chalcogenide Nanostructures

Jha

Bhat

2020

Adv Materials Inter

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bonding of transition metal and chalcogen atom and their crystal structure. Interestingly, all these compounds exist as layered material except tungsten oxide (WO 3 ) whose hydrated crystal (WO 3 .H 2 O) is layered in nature. [2,3] Each of these chalcogenides possesses unique features. Several micro and nanostructures of these chalcogenides have been synthesized in literature for various applications including gas sensors, biosensors, batteries, supercapacitor, photoelectrochemical and electrochromic devices. However, this review article will focus on gas sensing applications of these materials.Gas sensors play a crucial role in our life as they find applications ranging from monitoring indoor air quality to detecting highly toxic gases. Two important components of a gas sensing device are receptor and transducer. The receptor enables the chemical interaction with the target analyte molecule, which is further converted into analytical signal by the transducer. There are several transduction techniques available in gas sensing based on the physical or chemical change being measured. Broadly, they can be classified into six different classes based on sensing principles which is listed in Table 1.Chemiresistive devices have several advantages over other existing techniques. For example, the structure of these types of devices is very simple and it can be integrated with the current complementary metal oxide semiconductor (CMOS) technology. Even though, several advances have been made over last few years to improve sensing performance, the search for reliable and repeatable gas sensing element is an ongoing endeavor with lots of expectation from tungsten and molybdenum chalcogenides.After the rise of graphene, other layered materials have emerged as important functional materials for various applications of highest scientific values. Among these, layered transition metal dichalcogenides (TMDs) have a special presence as they cover whole class of materials, i.e., ranging from pure insulators to true metals. W and Mo chalcogenides are mostly semiconducting in ambient conditions and therefore, suitable for electronic application such as chemiresistive gas sensors. Though, layered TMDs (MX 2 M = Mo, and W and X = S, Se, and Te) have evolved expeditiously in a very short time, we simply cannot ignore metal oxide (particularly Mo-and W-based Chalcogens are oxygen family elements with oxygen having distinct properties than the other group members like sulfur, selenium, and tellurium. Tungsten and molybdenum chalcogenides that include mainly metal oxides (MO 3 ; M = Mo, and W) and metal dichalcogenides (MX 2 ; X = S, Se, and Te) are the most exciting class of inorganic materials. They have been widely investigated in various applications including lithium and sodium ion storage, supercapacitors, gas sensors, biosensors etc. due to their fascinating surface properties and ease of fabrication. Different class of nanostructures including 0D (nanoparticles, quantum dots), 1D (nanowires, nanotubes, nanoribbons, nanobelts etc.), a...

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Sensors: Pt Nanoparticles Sensitized Ordered Mesoporous WO₃ Semiconductor: Gas Sensing Performance and Mechanism Study (Adv. Funct. Mater. 6/2018)

Cited by 19 publications

References 0 publications

Exhaling‐Driven Hydroelectric Nanogenerators for Stand‐Alone Nonmechanical Breath Analyzing

Exhaling‐Driven Hydroelectric Nanogenerators for Stand‐Alone Nonmechanical Breath Analyzing

Hierarchical Ordered Dual‐Mesoporous Polypyrrole/Graphene Nanosheets as Bi‐Functional Active Materials for High‐Performance Planar Integrated System of Micro‐Supercapacitor and Gas Sensor

Recent Progress in Chemiresistive Gas Sensing Technology Based on Molybdenum and Tungsten Chalcogenide Nanostructures

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Sensors: Pt Nanoparticles Sensitized Ordered Mesoporous WO3 Semiconductor: Gas Sensing Performance and Mechanism Study (Adv. Funct. Mater. 6/2018)

Cited by 19 publications

References 0 publications

Exhaling‐Driven Hydroelectric Nanogenerators for Stand‐Alone Nonmechanical Breath Analyzing

Exhaling‐Driven Hydroelectric Nanogenerators for Stand‐Alone Nonmechanical Breath Analyzing

Hierarchical Ordered Dual‐Mesoporous Polypyrrole/Graphene Nanosheets as Bi‐Functional Active Materials for High‐Performance Planar Integrated System of Micro‐Supercapacitor and Gas Sensor

Recent Progress in Chemiresistive Gas Sensing Technology Based on Molybdenum and Tungsten Chalcogenide Nanostructures

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Sensors: Pt Nanoparticles Sensitized Ordered Mesoporous WO₃ Semiconductor: Gas Sensing Performance and Mechanism Study (Adv. Funct. Mater. 6/2018)