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Issue 1, 2020
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A few-layer InSe-based sensitivity-enhanced photothermal fiber sensor

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Abstract

Two-dimensional (2D) InSe has recently attracted increasing attention due to its outstanding electrical transport property, excellent photo-response, and direct band gap characteristics. In this contribution, few-layer InSe was successfully fabricated via a facile liquid phase exfoliation (LPE) method. Compared with other 2D materials, the photothermal response measurements demonstrate that InSe has excellent photothermal conversion efficacy. A novel Vernier-cascaded photothermal fiber sensor with high sensitivity that takes advantage of the photothermal effect of few-layer InSe has been proposed and demonstrated for the first time. The experimental results have shown that the photothermal optical sensitivity and spectral shifts of the MZI (Mach–Zehnder interferometer)–MKR (microfiber knot ring) Vernier sensor and the Vernier part are 0.126 nm mW−1, 12.22 nm and 0.0047 nm mW−1, 0.49 nm, respectively. A maximum sensitivity amplification factor of ∼26.8 is realized. Our present work can provide more possibilities of 2D materials that can be utilized towards cascade sensors.

Graphical abstract: A few-layer InSe-based sensitivity-enhanced photothermal fiber sensor

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Article information


Submitted
24 Oct 2019
Accepted
11 Nov 2019
First published
13 Nov 2019

J. Mater. Chem. C, 2020,8, 132-138
Article type
Paper

A few-layer InSe-based sensitivity-enhanced photothermal fiber sensor

R. Wang, Q. Wu, X. Jiang, T. Fan, J. Guo, C. Wang, F. Zhang, Y. Gao, M. Zhang, Z. Luo and H. Zhang, J. Mater. Chem. C, 2020, 8, 132
DOI: 10.1039/C9TC05818D

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