Preparation of Gold Nanoparticles Assemblies with Controllable,Continuous and Discrete Nanostructures†

doi:10.7503/cjcu20141092

Abstract

Abstract:

Gold nanoparticles(AuNPs) with different sizes(15 and 40 nm) were prepared by reducing chlorauric acid with sodium citrate. The stability of AuNPs was increased when bis(p-sulfonatophenyl)phenylphosphine(BSPP) was used as ligand because of its large molecule size and electro-negativity in water. The assemblies of AuNPs were obtained when AuNPs with different particle sizes were conjugated with two thiol-terminated, single-stranded, and complementary DNA(HS-DNA), respectively, and hybridized each other. The results indicated that AuNPs assemblies could have controllable, continuous and discrete nanostructures with molar ratios of 1∶1, 2∶1 and 3∶1 in the presence of BSPP and with extended strands of DNA as linkers.

Key words: Au nanoparticle, DNA linker, Assembly, Nanostructure

CLC Number:

O614

TrendMD:

JIN Ping, DAI Zhao, GUO Wenjuan, CHEN Guangping. Preparation of Gold Nanoparticles Assemblies with Controllable,Continuous and Discrete Nanostructures^†[J]. Chem. J. Chinese Universities, 2015, 36(5): 844.

Figures/Tables 7

Scheme 1 Preparation of AuNPs using citric acid trisodium or BSPP as ligand

Scheme 2 Preparation of AuNPs assemblies with BSPP and extended DNA linkers

Fig.1 Absorption spectra of Au15 nanoparticles(a0—a2) and Au15 nanoparticles with 50 mmol/L BSPP(b0—b2) dispersed in water with different NaCl concentrationsc(NaCl)/(mmol·L-1): a0, b0. 0; a1, b1. 50; a2, b2. 100.

Fig.2 TEM images of AuNPs with 50 mmol/L NaCl(A) and 50 mmol/L NaCl+50 mmol/L BSPP(B)

Fig.3 TEM images(A—C) and absorption spectra(D) of AuNPs assemblies with no BSPP and o extended-DNA linkern(Au15)∶n(Au40) of the mixture: (A), a. 1∶1; (B), b. 2∶1; (C), c. 3∶1.

Fig.4 TEM images(A—C) and absorption spectra(D) of AuNPs assemblies with BSPP but o extended-DNA linkern(Au15)∶n(Au40) of the mixture: (A), a. 1∶1; (B), b. 2∶1; (C), c. 3∶1.

Fig.5 TEM images(A—C) and absorption spectra(D) of AuNPs assemblies with BSPP and xtended-DNA linkern(Au15)∶n(Au40) of the mixture: (A), a. 1∶1; (B), b. 2∶1; (C), c. 3∶1.

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