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. 2019 Mar 19;7:144. doi: 10.3389/fchem.2019.00144

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Copyright © 2019 Li, Wang, Zhang, Zhang, Yang and Zhao.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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(A) SERS spectra of 4-MBA adsorbed on Ga-doped ZnO NPs with various initial ratio of Ga and Zn(from a to j): 0, 0.3, 0.5, 0.7, 0.9, 2, 4, 6, 8, and 10%. (B) The relationship between the intensity of the 1,594 cm⁻¹ peak and the actual ratio of Ga and Zn for Ga-doped ZnO NPs.