Quantification of nanodiamonds in aqueous solutions by spectrophotometry and thermal lens spectrometry

• Published in: Journal of analytical chemistry (New York, N.Y.) Vol. 67; no. 10; pp. 842 - 850
• Main Authors: Volkov, D. S., Semenyuk, P. I., Korobov, M. V., Proskurnin, M. A.
• Format: Journal Article
• Language: English
• Published: Dordrecht SP MAIK Nauka/Interperiodica 01.10.2012; Springer
• Subjects: Analytical Chemistry; Chemistry; Chemistry and Materials Science; Spectrum analysis; spectrophotometry; detonation nanodiamonds; thermal lens spectrometry
• ISSN: 1061-9348; 1608-3199
• DOI: 10.1134/S1061934812100115

Spectrophotometry and thermal lens spectrometry were used to study solutions of several commercial detonation nanodiamonds. It was found that the absorption spectra of solutions of all studied nanodiamond samples obey the Bouger-Lambert-Beer law, which ensures the precise determination of the total mass concentration of unknown nanodiamond solutions using a calibration plot. It was shown that the absorption spectra of nanodiamond solutions exhibit both absorption and scattering components, both significantly affecting signal formation. Conditions were proposed for the spectrophotometric determination of nanodiamonds at 250 nm ( l = 1.0 cm). The detection limits were from 60 ng/mL to 2 μg/mL, depending on the nanodiamond type. Limits of detection of SDND nanodiamonds by spectrophotometry and thermal lens spectrometry were calculated for identical conditions of sample preparation and measurements (488 nm, l = 1.0 cm). These were 10 and 0.6 μg/mL for spectrophotometry and thermal lens spectrometry, respectively (power of excitation radiation 150 mW).