Mechanism in the Preparation of Gold Nanoflowers by Ascorbic Acid Reduction†

doi:10.7503/cjcu20160608

Abstract

Abstract:

The mechanism in the preparation of gold nanoflowers using the mixture of HAuCl₄ and ascorbic acid(AA) as growth solution was investigated. It was identified that the AA concentration affected the attachment of the small gold particles on the seeds and the intraparticle ripening of the gold nanoflowers, thus resulting in the formation of the flowers with different morphologies and optical properties. It is effective to tune morphology and optical property of the gold nanoflowers by optimizing the AA concentration and pH of the growth solution simultaneously. Surface enhanced Raman scattering(SERS) results indicated the as-prepared gold nanoflowers showed good SERS activity to Rhodamine 6G, suggesting the clean surface character of the flowers prepared by AA reduction.

Key words: Gold nanoflowers, Ascorbic acid, Intraparticle ripening, Aggregation, Seeding approach

CLC Number:

O614
O648

TrendMD:

YANG Shuang, JI Xiaohui, YANG Wensheng. Mechanism in the Preparation of Gold Nanoflowers by Ascorbic Acid Reduction^†[J]. Chem. J. Chinese Universities, 2016, 37(12): 2125.

Figures/Tables 5

Fig.1 UV-Vis spectra(A) and corresponding TEM images(B—F) of gold nanoparticles obtained under different concentrations of AAConcentration of AA/(mmol·L-1): (A) a. 0; b. 0.75; c. 1.25; d. 1.75; e. 2.50; f. 5.00. (B) 0; (C) 0.75; (D) 1.25; (E) 1.75; (F) 5.00. Inset of (F): high-resolution TEM images of a branch of the gold nanoflowers. All the data were collected after 10 s of the reactions when color of the solutions kept unchanged.

Fig.2 Temporal evolution of the maximum extinction(A) and position of the plasmon bands(B) in UV-Vis spectra under AA concentrations of 0.75 mmol/L(a) and 1.75 mmol/L(b)

Fig.3 Variation in pH values of the reaction solutions with AA concentrations(A), temporal evolution of the maximum extinction(B) and position of the plasmon bands(C) in UV-Vis spectra with AA concentrations of 0.75 mmol/L(a) and 1.75 mmol/L(b) at pH=5.1 and variation in zeta-potential of the 25 nm gold seeds with the AA concentration at pH=5.1(D)

Fig.4 UV-Vis spectra of the gold nanoflowers prepared under different pH values at AA concentration of 1.75 mmol/L(A), TEM images of the as-prepared gold nanoflowers under pH=3.1(B), 5.1(C) and 6.0(D) at AA concentration of 1.75 mmol/LpH: a. 3.1; b. 4.0; c. 5.1; d. 6.0; e. 7.0.

Fig.5 SERS spectra of R6G(10-4 mol/L) in presence of the gold nanoparticles as prepared(A) and the gold nanoflowers synthesized under pH=7.0(λmax=660 nm) capped by CTAB, PVP, citrate and AA(B)(A) a. Gold nanospheres; b. gold nanoflowers prepared under pH=3.1; c. gold nanoflowers prepared under pH=5.1; d. gold nanoflowers prepared under pH=7.0. (B) a. Capped by CTAB; b. capped by PVP; c. capped by citrate; d. capped by AA.

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