Portal de Periódicos da CAPES

Laser-Deposited Carbon Aerogel Derived from Graphene Oxide Enables NO 2 -Selective Parts-per-Billion Sensing

2020; American Chemical Society; Volume: 12; Issue: 35 Linguagem: Inglês

10.1021/acsami.0c09112

1944-8252

Sebastian Nufer, Peter J. Lynch, Matthew Large, Sean P. Ogilvie, Jonathan P. Salvage, Mario Peláez-Fernández, Thomas Waters, Izabela Jurewicz, Edgar Muñoz, Raúl Arenal, Ana M. Benito, Wolfgang K. Maser, Nikos Tagmatarchis, Chris Ewels, Adam N. Brunton, Alan Β. Dalton,

Air Quality Monitoring and Forecasting

Laser-deposited carbon aerogel is a low-density porous network of carbon clusters synthesized using a laser process. A one-step synthesis, involving deposition and annealing, results in the formation of a thin porous conductive film which can be applied as a chemiresistor. This material is sensitive to NO2 compared to ammonia and other volatile organic compounds and is able to detect ultra-low concentrations down to at least 10 parts-per-billion. The sensing mechanism, based on the solubility of NO2 in the water layer adsorbed on the aerogel, increases the usability of the sensor in practically relevant ambient environments. A heating step, achieved in tandem with a microheater, allows the recovery to the baseline, making it operable in real world environments. This, in combination with its low cost and scalable production, makes it promising for Internet-of-Things air quality monitoring.