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1. Chemchromic Sensor

The chemochromic hydrogen sensor for safety is used for detection of H2 gas by using color change induced by redox reaction. Advantages using this sensor are easy to use, mobility without a power supply system and cost effectiveness. It can be applied to industry field where consumes H2 as processing materials for reduction. Our group has been fabricating various chemochromic sensors using transition metal oxides such as WOx, MoOx, and TiOx and metal-catalysts. In order to achieve high performance of color change, we are investigating characteristics of structural, optical, electronic and chemical analysis and developing optimized processes such as chemical-bath deposition and physical vapor deposition.

Oxide doping Technique
Further Readings
“Eye-readable gasochromic and optical hydrogen gas sensor based on CuS-Pd”,RSC Adv. 5, 9028-9034 (2014) “Green deposition of Pd nanoparticles on WO3 for optical, electronic and gasochromic hydrogen sensing applications”, Sensors and Actuators B 221 411-417 (2015)

2. Plasmonic Universal Gas Sensor

We are developing the plasmonic gas sensor which changes the color and resistivity simultaneously by the amplified chemochromic effect and/or local plasmon resonance. The diagram represents results of partially reduced black Pd-TiO2 for Fluorine gas detection.
It consists of TiO2 nanorods and Pd metal nanoparticles and changes colors and resistivity upon gas exposure. The ultimate goal is to develop the universal gas reactive plasmonic gas sensors by mechanical force.

Plasmonic Universal Gas Senso
Further Readings
“Significant enhancement in visible light absorption of TiO2 nanotube arrays by surface band gap tuning J. Phys. Chem. C. 117 (33), 16811-16819 (2013) “Generation of Highly n-type Titanium Oxide Using Plasma Fluorine Insertion”, Nano Lett. 11, 751-756 (2011).
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