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Lab Chip

Title:		On-chip integration of a metal-organic framework nanomaterial on a SiO(2) waveguide for sensitive VOC sensing
Author(s):		Ma X; Wu J; Jiang L; Wang M; Deng G; Qu S; Chen K;
Address:		"School of Optoelectronic Science and Engineering, Key Lab of Optical Fiber Sensing and Communication (Ministry of Education), University of Electronic Science and Technology of China, Chengdu, 611731, China. jieyunwu@uestc.edu.cn chenkx@uestc.edu.cn"
Journal Title:		Lab Chip
Year:		2021
Volume:		20210810
Issue:		17
Page Number:		3298 - 3306
DOI:		10.1039/d1lc00503k
ISSN/ISBN:		1473-0189 (Electronic) 1473-0189 (Linking)
Abstract:		"In silicon photonic waveguides, the on-chip integration of high-performance nanomaterials is considerably important to enable the waveguide sensing function. Herein, the in situ self-assembly of the low refractive index (RI) metal-organic framework nanomaterial ZIF-8 with a large surface area and high porosity on the surface of a designated SiO(2) waveguide for evanescent wave sensing is demonstrated. The surface morphology and transmission loss of the nano-functionalized waveguide are investigated. The specific design and fabrication of asymmetric Mach-Zehnder interferometers (AMZIs) are performed based on the optical properties of ZIF-8. Such efforts in waveguide engineering result in an output interfering spectrum of nano-functionalized AMZI with an ultra-high extinction ratio (28.6 dB), low insertion loss ( approximately 13 dB) and suitable free spectral range ( approximately 30 nm). More significantly, the outstanding sensing features of ZIF-8 are successfully realized on the SiO(2) waveguide chip. The results of ethanol detection show that the AMZI sensor has a large detection range (0 to 1000 ppm), high sensitivity (19 pm ppm(-1) from 0 to 50 ppm or 41 pm ppm(-1) from 600 to 1000 ppm) and low detection limit (1.6 ppm or 740 ppb). This combination of nanotechnology and optical waveguide technology is promising to push forward lab-on-waveguide technology for volatile organic compound (VOC) detection"
Keywords:		*Metal-Organic Frameworks *Nanostructures Silicon Silicon Dioxide *Volatile Organic Compounds;
Notes:		"MedlineMa, Xiaoxia Wu, Jieyun Jiang, Lianzhong Wang, Mengke Deng, Guowei Qu, Shiwei Chen, Kaixin eng Research Support, Non-U.S. Gov't England 2021/08/12 Lab Chip. 2021 Sep 7; 21(17):3298-3306. doi: 10.1039/d1lc00503k. Epub 2021 Aug 10"