Staff View: Controlled synthesis of ultrathin MoS2 nanoflowers for highly enhanced NO2 sensing at room temperature

Controlled synthesis of ultrathin MoS2 nanoflowers for highly enhanced NO2 sensing at room temperature

Fabrication of a high-performance room-temperature (RT) gas sensor is important for the future integration of sensors into smart, portable and Internet-of-Things (IoT)-based devices. Herein, we developed a NO2 gas sensor based on ultrathin MoS2 nanoflowers with high sensitivity at RT. The MoS2 flowe...

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Main Authors:	Nguyen, Tat Thang, Le, Thi Hong, Nguyen, Hoang Thoan, Chu, Manh Hung, Nguyen, Van Duy, Nguyen, Van Hieu, Nguyen, Duc Hoa
Format:	Article
Language:	English
Published:	Royal Society Chemistry 2020
Online Access:	https://dlib.phenikaa-uni.edu.vn/handle/PNK/590
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spelling	oai:localhost:PNK-5902022-08-17T05:54:38Z Controlled synthesis of ultrathin MoS2 nanoflowers for highly enhanced NO2 sensing at room temperature Nguyen, Tat Thang Le, Thi Hong Nguyen, Hoang Thoan Chu, Manh Hung Nguyen, Van Duy Nguyen, Van Hieu Nguyen, Duc Hoa Fabrication of a high-performance room-temperature (RT) gas sensor is important for the future integration of sensors into smart, portable and Internet-of-Things (IoT)-based devices. Herein, we developed a NO2 gas sensor based on ultrathin MoS2 nanoflowers with high sensitivity at RT. The MoS2 flower-like nanostructures were synthesised via a simple hydrothermal method with different growth times of 24, 36, 48, and 60 h. The synthesised MoS2 nanoflowers were subsequently characterised by scanning electron microscopy, X-ray diffraction, Raman spectroscopy, energy-dispersive X-ray spectroscopy and transmission electron microscopy. The petal-like nanosheets in pure MoS2 agglomerated to form a flower-like structure with Raman vibrational modes at 378 and 403 cm−1 and crystallisation in the hexagonal phase. The specific surface areas of the MoS2 grown at different times were measured by using the Brunauer–Emmett–Teller method. The largest specific surface area of 56.57 m2 g−1 was obtained for the MoS2 nanoflowers grown for 48 h. This sample also possessed the smallest activation energy of 0.08 eV. The gas-sensing characteristics of sensors based on the synthesised MoS2 nanostructures were investigated using oxidising and reducing gases, such as NO2, SO2, H2, CH4, CO and NH3, at different concentrations and at working temperatures ranging from RT to 150 °C. The sensor based on the MoS2 nanoflowers grown for 48 h showed a high gas response of 67.4% and high selectivity to 10 ppm NO2 at RT. This finding can be ascribed to the synergistic effects of largest specific surface area, smallest crystallite size and lowest activation energy of the MoS2-48 h sample among the samples. The sensors also exhibited a relative humidity-independent sensing characteristic at RT and a low detection limit of 84 ppb, thereby allowing their practical application to portable IoT-based devices. 2020-10-13T04:33:05Z 2020-10-13T04:33:05Z 2020 Article Working Paper https://dlib.phenikaa-uni.edu.vn/handle/PNK/590 10.1039/D0RA00121J en application/pdf Royal Society Chemistry
institution	Digital Phenikaa
collection	Digital Phenikaa
language	English
description	Fabrication of a high-performance room-temperature (RT) gas sensor is important for the future integration of sensors into smart, portable and Internet-of-Things (IoT)-based devices. Herein, we developed a NO2 gas sensor based on ultrathin MoS2 nanoflowers with high sensitivity at RT. The MoS2 flower-like nanostructures were synthesised via a simple hydrothermal method with different growth times of 24, 36, 48, and 60 h. The synthesised MoS2 nanoflowers were subsequently characterised by scanning electron microscopy, X-ray diffraction, Raman spectroscopy, energy-dispersive X-ray spectroscopy and transmission electron microscopy. The petal-like nanosheets in pure MoS2 agglomerated to form a flower-like structure with Raman vibrational modes at 378 and 403 cm−1 and crystallisation in the hexagonal phase. The specific surface areas of the MoS2 grown at different times were measured by using the Brunauer–Emmett–Teller method. The largest specific surface area of 56.57 m2 g−1 was obtained for the MoS2 nanoflowers grown for 48 h. This sample also possessed the smallest activation energy of 0.08 eV. The gas-sensing characteristics of sensors based on the synthesised MoS2 nanostructures were investigated using oxidising and reducing gases, such as NO2, SO2, H2, CH4, CO and NH3, at different concentrations and at working temperatures ranging from RT to 150 °C. The sensor based on the MoS2 nanoflowers grown for 48 h showed a high gas response of 67.4% and high selectivity to 10 ppm NO2 at RT. This finding can be ascribed to the synergistic effects of largest specific surface area, smallest crystallite size and lowest activation energy of the MoS2-48 h sample among the samples. The sensors also exhibited a relative humidity-independent sensing characteristic at RT and a low detection limit of 84 ppb, thereby allowing their practical application to portable IoT-based devices.
format	Article
author	Nguyen, Tat Thang Le, Thi Hong Nguyen, Hoang Thoan Chu, Manh Hung Nguyen, Van Duy Nguyen, Van Hieu Nguyen, Duc Hoa
spellingShingle	Nguyen, Tat Thang Le, Thi Hong Nguyen, Hoang Thoan Chu, Manh Hung Nguyen, Van Duy Nguyen, Van Hieu Nguyen, Duc Hoa Controlled synthesis of ultrathin MoS2 nanoflowers for highly enhanced NO2 sensing at room temperature
author_facet	Nguyen, Tat Thang Le, Thi Hong Nguyen, Hoang Thoan Chu, Manh Hung Nguyen, Van Duy Nguyen, Van Hieu Nguyen, Duc Hoa
author_sort	Nguyen, Tat Thang
title	Controlled synthesis of ultrathin MoS2 nanoflowers for highly enhanced NO2 sensing at room temperature
title_short	Controlled synthesis of ultrathin MoS2 nanoflowers for highly enhanced NO2 sensing at room temperature
title_full	Controlled synthesis of ultrathin MoS2 nanoflowers for highly enhanced NO2 sensing at room temperature
title_fullStr	Controlled synthesis of ultrathin MoS2 nanoflowers for highly enhanced NO2 sensing at room temperature
title_full_unstemmed	Controlled synthesis of ultrathin MoS2 nanoflowers for highly enhanced NO2 sensing at room temperature
title_sort	controlled synthesis of ultrathin mos2 nanoflowers for highly enhanced no2 sensing at room temperature
publisher	Royal Society Chemistry
publishDate	2020
url	https://dlib.phenikaa-uni.edu.vn/handle/PNK/590
_version_	1751856317460381696
score	8.891053

Controlled synthesis of ultrathin MoS2 nanoflowers for highly enhanced NO2 sensing at room temperature

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