We present an experimental comparison of photoacoustic responsivities of common highly absorbing carbon-based materials. The comparison was carried out with parameters relevant for photoacoustic power detectors and Fourier-transform infrared (FTIR) spectroscopy: we covered a broad wavelength range from the visible red to far infrared (633 nm to 25 um) and the regime of low acoustic frequencies (< 1 kHz). The investigated materials include a candle soot-based coating, a black paint coating and two different carbon nanotube coatings. Of these, the low-cost soot absorber produced clearly the highest photoacoustic response over the entire measurement range.
@article{arxiv.2012.01568,
title = {Photoacoustic characteristics of carbon-based infrared absorbers},
author = {Jussi Rossi and Juho Uotila and Sucheta Sharma and Toni Laurila and Roland Teissier and Alexei Baranov and Erkki Ikonen and Markku Vainio},
journal= {arXiv preprint arXiv:2012.01568},
year = {2020}
}