Photoacoustic characteristics of carbon-based infrared absorbers

We present an experimental comparison of photoacoustic responsivities common highly absorbing carbon-based materials. The was carried out with parameters relevant for power detectors and Fourier-transform infrared (FTIR) spectroscopy: we covered a broad wavelength range from the visible red to far (633 nm 25 ?m) regime low acoustic frequencies (< 1 kHz). investigated materials include candle soot-based coating, black paint coating two different carbon nanotube coatings. Of these, low-cost soot absorber produced clearly highest response over entire measurement range.