Ammonia vapour sensing properties of <i>in situ</i> polymerized conducting PANI-nanofiber/WS<sub>2</sub> nanosheet composites

Jha, RM; Wan, Meher; Jacob, Chacko; Guha, Prasanta Kumar

doi:10.1039/c7nj03343e

Cited by 69 publications

(29 citation statements)

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“…In particular, the Raman spectrum of WS 2 -PANI film (blue spectrum, Figure 2D) reveals distinct shifts and broadening of the peaks at 355 and 420 cm −1 in the WS 2 Raman scattering result (red spectrum, Figure 2D) ascribed to the E 1 2g (in-plane optical mode) and A 1g (out-of plane vibration mode) modes, respectively. [46] These peak transformations likely account for the dispersion of the WS 2 sheets within the PANI network via interactions of with nitrenium cations of aniline. [47,48] Furthermore, the significant changes in the spectral positions and widths of the Raman signals around 600 cm −1 between pure PANI (black spectrum) and WS 2 -PANI (blue spectrum) indicate conformational changes induced by incorporation of the WS 2 domains within the PANI matrix, resulting in more planar chains.…”

Section: Synthesis and Characterization Of Ws 2 -Pani Electrodesmentioning

confidence: 99%

Tungsten‐Disulfide/Polyaniline High Frequency Supercapacitors

Adhikari

Shauloff

Shalish

et al. 2021

Adv Elect Materials

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Transition metal dichalcogenides are considered promising constituents in energy storage devices due to their large surface areas, 2D sheet structures, and occurrence of efficient redox reactions at their surfaces. Supercapacitors comprising WS2‐polyaniline (PANI) composite electrodes which exhibit excellent electrochemical properties, particularly effective high frequency response, are constructed. The highly porous WS2‐PANI device facilitate rapid ion transport and surface access, aiding rapid reversible redox reactions contributing to the high frequency pseudocapacitive profile of the device. The symmetric WS2‐PANI supercapacitor displays significantly higher capacitance of 180 µF cm−2 at a frequency of 120 Hz. This study points to potential application of WS2 composites in high frequency applications such as alternating current line filtering, and may open new avenues for employing the material in energy storage applications.

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Section: Synthesis and Characterization Of Ws 2 -Pani Electrodesmentioning

confidence: 99%

Tungsten‐Disulfide/Polyaniline High Frequency Supercapacitors

Adhikari

Shauloff

Shalish

et al. 2021

Adv Elect Materials

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“…The long-term acceptable exposure limit of NH 3 is around 50 ppm, as reported by the occupational safety and health administration (OSHA). [3][4][5] Exposure to NH 3 above this limit may lead to serious health issues. Thus, selective and sensitive detection of NH 3 is a vital safety measure for a pollution-free ecosystem.…”

Section: Introductionmentioning

confidence: 99%

Porous reduced graphene oxide (rGO)/WO₃ nanocomposites for the enhanced detection of NH₃ at room temperature

et al. 2019

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“…An improvement of 5.5 and 1.1 times at lower humidity level (40% RH) and 15.7 and 1.04 times at higher humidity level (80% RH) was observed over WS 2 and GO‐based devices, respectively. They also synthesized WS 2 /PANI nanocomposite with enhanced sensing capabilities over WS 2 nanosheet and PANI nanofiber‐based sensors with excellent sensitivity and improved selectivity toward ammonia vapor at room temperature 223…”

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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Ammonia vapour sensing properties of in situ polymerized conducting PANI-nanofiber/WS₂ nanosheet composites

Abstract: A chemiresistive sensor based on nanocomposites of HCl doped-PANI-nanofibers and WS2 nanosheets which is prepared by the template-free in situ polymerization of aniline on WS2 nanosheets is cost effective, reliable, stable and compatible with the current CMOS technology.

Cited by 69 publications

References 58 publications

Tungsten‐Disulfide/Polyaniline High Frequency Supercapacitors

Tungsten‐Disulfide/Polyaniline High Frequency Supercapacitors

Porous reduced graphene oxide (rGO)/WO₃ nanocomposites for the enhanced detection of NH₃ at room temperature

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

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Ammonia vapour sensing properties of in situ polymerized conducting PANI-nanofiber/WS2 nanosheet composites

Abstract: A chemiresistive sensor based on nanocomposites of HCl doped-PANI-nanofibers and WS2 nanosheets which is prepared by the template-free in situ polymerization of aniline on WS2 nanosheets is cost effective, reliable, stable and compatible with the current CMOS technology.

Cited by 69 publications

References 58 publications

Tungsten‐Disulfide/Polyaniline High Frequency Supercapacitors

Tungsten‐Disulfide/Polyaniline High Frequency Supercapacitors

Porous reduced graphene oxide (rGO)/WO3 nanocomposites for the enhanced detection of NH3 at room temperature

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

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Product

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About

Ammonia vapour sensing properties of in situ polymerized conducting PANI-nanofiber/WS₂ nanosheet composites

Porous reduced graphene oxide (rGO)/WO₃ nanocomposites for the enhanced detection of NH₃ at room temperature