期刊
JOURNAL OF LIGHTWAVE TECHNOLOGY
卷 35, 期 18, 页码 3940-3944出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JLT.2017.2698044
关键词
Agarose; humidity sensor; microfiber
资金
- University of Malaya Research [D000009-16001]
- Indonesia Endowment Fund for Education [PRJ-782/LPDP.3/2016]
Humidity sensors rely on humidity-induced refractive index change in the sensing material despite the sensor configuration. Polymer-based microwires can absorb water vapor molecules and detect humidity changes without the need of further coating. However, the sensitivity-simplicity trade-off is still a challenge. Sophisticated coatingmethods, complex resonating structures, and nanostructured films are reported as methods to enhance the device sensitivity. A simple technique, to build a high sensitivity RH sensor based on an agarose-doped Poly Methyl Methacrylate (PMMA) sensor head, is demonstrated. The waist diameter and uniform length of the PMMA doped agarose gel microfiber were measured to be 6 mu m and 10 mm, respectively. The sensor can achieve power variation of up to 2.9 mu W in a wide relative humidity range (50-80%), and display linear response with a correlation coefficient of 98.29%, sensitivity of 0.421 dB/% RH, and resolution of 0.431% RH. This agarose-based optical sensor provides a beneficial complement to the existing electrical ones, and will promote the employment of agarose in chemical sensing techniques.
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