Preparation of GSH-Modified Au Nanorods and Their Interaction with Copper Ions†

doi:10.7503/cjcu20160406

Abstract

Abstract:

Au nanorods(Au NRs) modified by glutathione(GSH) were prepared. Based on the dependence of localized surface plasmon resonance(LSPR) peak shift on their arrangement, the structure and optical properties of GSH-modified Au NRs was studied at different pH conditions. At pH=5, some metal ions were chosen to detect the effect of their interaction with GSH-Au NRs on the LSPR peak of Au NRs. The results demonstrate that Cu²⁺ can obviously induce red shift of LSPR peak comparing with other metal ions. The reason is the rearrangement of Au NRs induced by Cu²⁺. Meanwhile, the photothermal experiment for pure Au NRs and GSH-Au NRs with copper ions were carried out to detect the effect of copper ions on optical properties of Au NRs. Comparing with pure Au NRs, GSH-Au NRs with copper ions decreased the efficiency of phothothermal conversion. During photothermalcoversion process, copper maybe capture the electron of Au NRs and decrease the efficiency of nonirradiation. So, Au NRs modified by GSH show the selective detection for Cu²⁺. The results here maybe provide a new method for detection of heavy metal ions.

Key words: Au Nanorods, Glutathione(GSH), Cu2+ ion, Localized surface plasmon resonance(LSPR) absorption, Inorganic nanocomposite

TrendMD:

ZHANG Lingyue, CHI Yanan, SHAN Guiye, CHEN Yanwei, LIU Na. Preparation of GSH-Modified Au Nanorods and Their Interaction with Copper Ions^†[J]. Chem. J. Chinese Universities, 2016, 37(7): 1239.

Figures/Tables 7

Fig.1 LSPR spectra of pure Au nanorods(a) and Au nanorods modified with GSH molecular at different pH valuespH: b. 2; c. 3; d. 4; e. 5; f. 6; g. 11; h. 12.

Fig.2 TEM images of pure Au nanorods(A), GSH-Au NRs at pH=2(B) and pH=12(C)

Fig.3 Surface zeta potential of GSH-Au NRs at different pH values

Fig.4 Absorption spectra of GSH-Au NRs with Cu2+ of different concentrationsc(Cu2+)/(mmol·L-1): a. 0; b. 0.080; c. 0.205; d.0.425.

Fig.5 TEM image of GSH-Au NRs with 0.205 mmol/L Cu2+ at pH=5

Fig.6 Effects of different metal ions on LSPR absorption of GSH-Au NRsa. Au NRs; b. Ca2+; c. Zn2+; d. Mg2+; e. Mn2+; f. Na+; g. Fe3+; h. Al3+; i. Cu2+.

Fig.7 Photothermal curves before and after irradiation(A) and the infrared images of Au NRs(B), GSH-Au NRs+0.01 mmol/L Cu2+(C) and GSH-Au NRs+1 mmol/L Cu2+(D) under laser irradiation

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