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Article

Surface Functionalization Utilizing Mesoporous Silica Nanoparticles for Enhanced Evanescent-Field Mid-Infrared Waveguide Gas Sensing

1
Department of Materials Science and Engineering, Texas A&M University, College Station, TX 77843, USA
2
Department of Electrical and Computer Engineering, Texas A&M University, College Station, TX 77843, USA
3
Department of Computer Science and Engineering, Texas A&M University, College Station, TX 77843, USA
4
Department of Biomedical Engineering, Texas A&M University, College Station, TX 77843, USA
*
Authors to whom correspondence should be addressed.
Academic Editor: Alberto Palmero
Coatings 2021, 11(2), 118; https://doi.org/10.3390/coatings11020118
Received: 26 December 2020 / Revised: 15 January 2021 / Accepted: 18 January 2021 / Published: 21 January 2021
This work focuses on the development of nanoparticle-based layer-by-layer (LbL) coatings for enhancing the detection sensitivity and selectivity of volatile organic compounds (VOCs) using on-chip mid-infrared (MIR) waveguides (WGs). First, we demonstrate construction of conformal coatings of polymer/mesoporous silica nanoparticles (MSNs) on the surface of Si-based WGs using the LbL technique and evaluate the coating deposition conditions, such as pH and substrate withdrawal speed, on the thickness and homogeneity of the assemblies. We then use the modified WGs to achieve enhanced sensitivity and selectivity of polar organic compounds, such as ethanol, versus non-polar ones, such as methane, in the MIR region. In addition, using density functional theory calculations, we show that such an improvement in sensing performance is achieved due to preferential adsorption of ethanol molecules within MSNs in the vicinity of the WG evanescent field. View Full-Text
Keywords: layer-by-layer; mesoporous silica nanoparticles; nanocoatings; mid-infrared gas sensing layer-by-layer; mesoporous silica nanoparticles; nanocoatings; mid-infrared gas sensing
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MDPI and ACS Style

Al Husseini, D.; Karanth, Y.; Zhou, J.; Willhelm, D.; Qian, X.; Gutierrez-Osuna, R.; Coté, G.L.; Lin, P.T.; Sukhishvili, S.A. Surface Functionalization Utilizing Mesoporous Silica Nanoparticles for Enhanced Evanescent-Field Mid-Infrared Waveguide Gas Sensing. Coatings 2021, 11, 118. https://doi.org/10.3390/coatings11020118

AMA Style

Al Husseini D, Karanth Y, Zhou J, Willhelm D, Qian X, Gutierrez-Osuna R, Coté GL, Lin PT, Sukhishvili SA. Surface Functionalization Utilizing Mesoporous Silica Nanoparticles for Enhanced Evanescent-Field Mid-Infrared Waveguide Gas Sensing. Coatings. 2021; 11(2):118. https://doi.org/10.3390/coatings11020118

Chicago/Turabian Style

Al Husseini, Diana, Yashaswini Karanth, Junchao Zhou, Daniel Willhelm, Xiaofeng Qian, Ricardo Gutierrez-Osuna, Gerard L. Coté, Pao Tai Lin, and Svetlana A. Sukhishvili. 2021. "Surface Functionalization Utilizing Mesoporous Silica Nanoparticles for Enhanced Evanescent-Field Mid-Infrared Waveguide Gas Sensing" Coatings 11, no. 2: 118. https://doi.org/10.3390/coatings11020118

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