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Pyrene-functionalized tungsten disulfide as stable resistive photosensor

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Version 2 2023-06-12, 09:29
Version 1 2023-06-09, 21:39
journal contribution
posted on 2023-06-12, 09:29 authored by Ruben Canton-Vitoria, Sebastian Nufer, Xiaoyang Che, Yuman Sayed-Ahmad Baraza, Raul Arenal, Carla Bittencourt, Adam Brunton, Alan DaltonAlan Dalton, Christopher P Ewels, Nikos Tagmatarchis
Pyrene carrying an 1,2-dithiolane linker was employed to functionalize exfoliated WS2 and the resulting material was used in a proof-of-concept application as a photoresistor type sensor. The WS2–pyrene hybrid material was comprehensively characterized by spectroscopic, thermal and microscopy techniques, coupled to density functional theory modelling. The high solubility of the WS2–pyrene hybrid material allows easy manipulation in wet media, making it suitable for device fabrication. Thus, a two-terminal resistive photosensor was developed and tested for photodetection. The photosensitivity of WS2 was improved by the presence of covalently attached pyrene by a factor of 2–3, the response linearly dependent on light intensity. Device reaction time was also improved, and critically the photosensor stability was significantly enhanced. Functionalization of exfoliated WS2 material heals vacancies, oxidation and other damage sites liable to impede photoelectric response. This proof-of-concept study opens the way for incorporation of diverse chromophores active in the visible and/or NIR region of the electromagnetic spectrum to WS2 in order to stabilise it and broaden its photoresistive sensing applicability.

History

Publication status

  • Published

File Version

  • Published version

Journal

Materials Advances

ISSN

2633-5409

Publisher

Royal Society of Chemistry

Page range

1-9

Pages

9.0

Department affiliated with

  • Physics and Astronomy Publications

Full text available

  • Yes

Peer reviewed?

  • Yes

Legacy Posted Date

2020-09-24

First Open Access (FOA) Date

2020-09-24

First Compliant Deposit (FCD) Date

2020-09-23

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