Table of Contents
Sensors, Volume 19, Issue 4 (February-2 2019) – 232 articles
- Issues are regarded as officially published after their release is announced to the table of contents alert mailing list.
- You may sign up for e-mail alerts to receive table of contents of newly released issues.
- PDF is the official format for papers published in both, html and pdf forms. To view the papers in pdf format, click on the "PDF Full-text" link, and use the free Adobe Reader to open them.
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.