The UV absorption of graphene oxide is size-dependent: possible calibration pitfalls

Mikrochimica Acta
Ting ZhangQiang Peng

Abstract

Graphene oxide (GO) is often quantified via its UV absorption, typically at around 230 nm. This is convenient but the effect of the size of GO on the accuracy of this method has been ignored so far. The authors report that the molar absorbance of GO is size-dependent. Data are presented on the absorbance of small (hydrodynamic diameter 1 μm), medium sized (1.5 μm), and large (2.2 μm) GO particles at wavelengths of 210, 230 and 250 nm. In general, linear relationship and good regression fits are obtained, but with different slope depending on size even at the same wavelength. This implies that using the UV absorption-based calibration may cause significant errors in GO quantification. Ultimately, this leads to incorrect dosages and faulty conclusions. This may also explain a variety of inconsistent results obtained in previous biological applications of GO. Graphical abstract The size of graphene oxide (GO) determines its UV absorption and the UV absorption-based calibration (GO-s, GO-m and GO-l represent the GO with small, medium and large size).

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Citations

Sep 3, 2020·Royal Society Open Science·Md Toasin Hossain AunkorAbul Kalam Azad
Dec 8, 2020·European Journal of Medicinal Chemistry·Yujie GaoQiang Peng
Jan 3, 2021·Colloids and Surfaces. B, Biointerfaces·Hanmei LiQiang Peng
Mar 30, 2021·Acta Pharmaceutica Sinica. B·Ting ZhangQiang Peng
May 29, 2021·Acta Biomaterialia·Hanmei LiQiang Peng

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