Analysis of the Effect of pH on the Stability and Optical Spectra of Au Nanoparticles Linked by Conductive BPE Molecule

Lukyanenko, A.V., Tsarenko, A.V., Aleksandrovsky, A.S., Fedorov, A.S., Umarova, A.Sh.// Journal of Siberian Federal University - Mathematics and Physics//

https://elib.sfu-kras.ru/handle/2311/154111

The preparation of detergent-free gold NPs by the citrate method is shown. The procedure of functionalization of monomeric Au NPs with 1,2-bis(2-pyridyl)ethylene (termed BPE) molecule to obtain Au-BPE dimers is described. According to the results of TEM analysis, the shape of the obtained NPs is close to spherical with a diameter of 21.94 0.28 nm. In dimers, the distance between NPs is controlled by the linker and is 0.75 0.12 nm, which is in agreement with the dimensions of the BPE molecule. According to the results of Experimental absorption UV-Vis spectra, measured over time, in 0.15 M nitric acid solution, Au-BPE dimers are more stable than in an alkali solution of the same molarity. Long-term exposure leads to a decrease in the intensity of the LSP peak of the dimers