Journal
JOURNAL OF MATERIALS CHEMISTRY C
Volume 8, Issue 1, Pages 132-138Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9tc05818d
Keywords
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Funding
- Science and Technology Development Fund [007/2017/A1, 132/2017/A3]
- Macao Special Administration Region (SAR), China
- National Natural Science Fund [61875138, 61435010, 6181101252, 51778030, 51978024]
- Science and Technology Innovation Commission of Shenzhen [KQTD2015032416270385, JCYJ20150625103619275, JCYJ 20170811093453105]
- Instrumental Analysis Center of Shenzhen University (Xili Campus)
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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 similar to 26.8 is realized. Our present work can provide more possibilities of 2D materials that can be utilized towards cascade sensors.
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