462239 Metal-Organic Frameworks Coated Opto-Electronic Gas Sensor Incorporated with Copper Sulfide Nanostructured Thin Films

Monday, November 14, 2016
Grand Ballroom B (Hilton San Francisco Union Square)
Yujing Zhang1, Xinyuan Chong2, Ki-Joong Kim3, John P. Baltrus4, Paul R. Ohodnicki4, Alan Wang2 and Chih-hung Chang3, (1)School of Chemical, Biological and Environmental Engineering, Oregon State University, Corvallis, OR, (2)School of Electrical Engineering and Computer Science, Oregon State University, Corvallis, OR, (3)School of Chemical, Biological, and Environmental Engineering, Oregon State University, Corvallis, OR, (4)U.S. Department of Energy, National Energy Technology Laboratory, Pittsburgh, PA

Near-infrared (NIR) gas sensing is an important technique that requires simple operation and low cost with high accuracy and quick response. However, the absorption band of gases at NIR region is typically low; therefore it is urgent to develop a new concept of sensing technology with high sensitivity. Low-cost materials consist of earth-abundant elements such as copper sulfide (CuxS) exhibit localized surface plasmon resonance (LSPR) throughout the NIR region and can be used as LSPR-based sensing material. In this work, CuxS thin films were fabricated by a modified successive ionic layer adsorption and reaction at room temperature. Dense and uniform CuxS thin films were obtained through low temperature annealing process in air. The annealed CuxS films showed nanoflake-shape and excellent opto-electrical properties that we could explore in the gas-sensing field. LSPR absorption is able to control by tuning the composition of CuxS. By introducing a thin layer of nanoporous material, metal-organic frameworks (MOFs), onto the surface of CuxS thin films, gas molecules can be concentrated within the LSPR field. The fabricated nano-composite films show an enhancement of CO2 absorption in NIR region compared to that of samples with only one type of film. Interestingly, the I-V test results showed that the conductivity of CuxS films was decreased with the existence of CO2 molecules. Based on our findings, MOF coated CuxS films can serve as an opto-electronic gas sensor in the NIR region.

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