Table of Contents
Sensors, Volume 19, Issue 4 (February-2 2019)
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Cover Story (view full-size image) The worldwide consumption of coffee exceeds 11 billion tons/year, and coffee grounds end up as [...] Read more. The worldwide consumption of coffee exceeds 11 billion tons/year, and coffee grounds end up as landfill. However, the unique structural properties of its surface make it interesting for the adsorption of gaseous species. Here, coffee grounds were used as a cheap source for biochar carbon. Coffee ground biochar (CGB) was investigated as a sensing material for humidity sensors, and it was characterized by laser granulometry, X-ray diffraction, Raman spectroscopy, field emission-scanning electron microscopy, X-ray photoelectron spectroscopy, thermogravimetric analysis, and N2 adsorption to understand its structural and surface properties. Humidity sensors were screen-printed onto alumina substrates. The CGB sensor response SR (%) was equal to 51% under 98% of relative humidity (RH), and the impedance started to decrease above 20% of RH. View this paper.