A Platinum Nanowire Sensor For Ethylene in Air
Nicholas J. Humphrey, Eric J. Choi, Nicholas P. Drago, John C. Hemminger, Reginald M. Penner*
ACS Sensors, ASAP (2023). 10.1021/acssensors.3c00885

Rapid, accurate, and sensitive, ethylene sensors are needed because ethylene is odorless and C2H4:air mixtures are explosive above 3% ethylene in air. but existing sensing modalities can not enable hand-held, portable, and continuous ethylene concentration monitoring in air. To this end, a single platinum nanowire (PtNW) chemiresistive sensor for ethylene gas is reported. In this application, the PtNW performs three functions: 1) Joule self-heating to a specified temperature, 2) in-situ resistance-based temperature measurement, and 3) detection of ethylene in air as a resistance change. Ethylene gas in air is detected as a reduction in nanowire resistance by up to 4.5% for concentrations ranging from 1 to 30 ppm in an optimum NW temperature range from 630 to 660 K.

December 20, 2022. Wenbo and her family visit UCI!.
Pictured in fron tof Natural Sciences II are: (from left) Ming (Microsoft), Alan, Amber, Wenbo (Amazon), & Reg (UCI).

Electrodeposition-Enabled, Electrically-Transduced Sensors and Biosensors: 2017 - Present.
Eric J.Choi, Nicholas P. Drago, Nicholas Humphrey, Justin Van Houten, Il-Doo Kim*, Alana F. Ogata*, Reginald M. Penner*
Materials Today (2023) 62, 129 - 150. 10.1016/j.mattod.2022.11.021

For close to 100 years, electrodeposition (ED) has been used as a versatile tool for preparing materials of all kinds on the surfaces of conductors. Over the last forty years, the unique attributes of ED have increased its application to the fabrication and function of sensors and biosensors. These attributes are: Precise control of the quantity of electrodeposited material, control of surface roughness of the deposited surface and/or the porosity of the electrodeposit using the applied deposition current and/or the potential, and the incorporation of other non-electroactive molecules and nanoparticles, in some cases. The surprisingly diverse literature relating to ED and sensing is the topic of this review, which focuses on publications since January, 2017.

Dinner at Sapori for Apurva, who is joining Graphwear, August 8, 2022. Congrats Apurva!
Clockwise from left - Nick Humphrey, Lauren Van (Portola HS, Irvine), Nick Drago, Heriberto Flores-Zuleta, Apurva Bhasin, Eric Choi, Reg, Theresa McIntire.

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