Ligand Exchange of Gold Nanoparticles with Thiol-terminated Polystyrene†

doi:10.7503/cjcu20170623

Abstract

Abstract:

Effect of molecular weight on the grafting-to method for thiol-terminated polystyrene(PS-SH) on gold nanoparticles was reported. The PSs with different molecular weights were synthesized by reversible addition fragmentation chain transfer(RAFT) polymerization. PS-SH was achieved by the reduction of propylamine. The above PS-SHs were used to transfer gold nanoparticles to tetrahydrofuran(THF) by grafting to method. The PS-SH with higher molecular weight showed poor ligand exchange effect, and higher PS concentration for ligand exchange was needed. When the molecular weight of PS-SH was about 59700, aggregation of gold nanoparticles after ligand exchange can not be avoid.

Key words: Reversible addition fragmentation chain transfer(RAFT) polymerization, Grafting to method, Gold nanoparticles, Thiol-terminated polystyrene

CLC Number:

O631

TrendMD:

LI Aiju, WANG Yuxi, LU Shaoyong, LIU Kun. Ligand Exchange of Gold Nanoparticles with Thiol-terminated Polystyrene^†[J]. Chem. J. Chinese Universities, 2018, 39(3): 552.

Figures/Tables 6

Table 1 RFAT polymerization of styrene with different molecular weights

c(CDB)/(mmol·L^-1)	c(AIBN)/(mmol·L^-1)	Time/h	Temperature/℃	M_n(GPC)	PDI(GPC)
19.50	1.00	2.0	60	6000	1.12
1.95	1.00	3.5	60	14200	1.06
1.95	1.00	1.0	80	20300	1.18
1.95	1.00	3.0	80	40400	1.19
1.95	1.00	20.0	80	59700	1.10

Scheme 1 Synthesis of CDB terminated PS by RAFT and the reduction of CDB to obtain thiol-terminated PS by propylamine

Fig.1 1H NMR spectra of PS achieved by RAFT(A) and PS-SH achieved by propylamine reduction(B)(A') and (B') are the dash line in (A) and (B), respectively.

Fig.2 GPC retention time of PS with different molecular weights

Fig.3 Extinction spectra of Au NPs@PS synthesized by citrate and grafting to method with different PS-SH molecular weights(A) and TEM images of citrate stabilized Au NPs in water(B) and Au NPs@PS with Mn=6000(C) and 14200(D) in THF

Fig.4 Extinction spectra of Au NPs@PS synthesized by grafting to method with 0.30 mmol/L(A) and 1.0 mmol/L(B) PS-SH and TEM images of Au NPs@PS synthesized by grafting to method with Mn=6000(C), 40400(D) and 59700(E)(1.0 mmol/L PS-SH solutions)

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