Preparation of Small Gold Nanorods

doi:10.11901/1005.3093.2020.542

Chinese Journal of Materials Research

2022, Vol. 36

Issue (7): 519-526 DOI: 10.11901/1005.3093.2020.542

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Preparation of Small Gold Nanorods

HU Qing¹, WU Chunfang¹(

), ZHANG Kaifeng², PAN Hao¹, LI Kun²

^1.School of Optoelectronic Engineering, Xi'an Technological University, Xi'an 710021, China
^2.Science and Technology on Vacuum Technology and Physics Laboratory, Lanzhou Institutute of Physics, Lanzhou 730000, China

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HU Qing, WU Chunfang, ZHANG Kaifeng, PAN Hao, LI Kun. Preparation of Small Gold Nanorods. Chinese Journal of Materials Research, 2022, 36(7): 519-526.

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Abstract

Small gold nanorods were synthesized by seed growth method. The morphology and properties of the nanorods could be controlled by changing the synthesis parameters. The extinction characteristics and morphology of gold nanorods were measured and observed by uV-vis-nIR spectrophotometer and transmission electron microscope (TEM). The effects of the amount of AgNO₃, cetyltrimethyl ammonium bromide (CTAB) and seed crystal on the morphology and properties of gold nanorods were investigated. The results show that the gold nanorods prepared under different conditions have good reproducibility. The gold nanorods synthesized under the optimum conditions of 0.035 mL of (0.01 mol/L) AgNO₃, 11 mL of (0.1 mol/L) CTAB and 1.1 mL of seed crystal, have an aspect ratio of about 3.8, an average length of about 34 nm, and good morphology uniformity and dispersion. The small gold nanorods could be used to detect a residue called Thiram.

Key words: metallic materials gold nanorods seed-mediated growth method aspect ratio thiram

Received: 21 December 2020

ZTFLH:

TB31

Fund: Key Laboratory for Equipment Pre-research(6142207190407);Scientific Research Program Funded by Shaanxi Provincial Education Department(21JY018)

About author: WU Chunfang, Tel: 18710975250, E-mail: wuchf@xatu.edu.cn

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	Qing HU
	Chunfang WU
	Kaifeng ZHANG
	Hao PAN
	Kun LI

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https://www.cjmr.org/EN/10.11901/1005.3093.2020.542 OR https://www.cjmr.org/EN/Y2022/V36/I7/519

Fig.1 A Schematic diagram for the preparation of gold seed solution

Fig.2 A schematic illustration of the synthesis of growth solution

Fig.3 Absorption spectra of gold nanorods prepared with different amounts (0.035、0.065、0.08、0.1 mL) of AgNO₃

Fig.4 TEM images of gold nanorods synthesized by different contents (a: 0.035 mL、b: 0.065 mL、c: 0.08 mL、d: 0.1 mL) of AgNO₃ (Scale bars: 100 nm)

Table 1 Effect of AgNO₃ contents on length, diameter, aspect ratio, longitudinal SPR and yield of gold nanorods

Fig.5 Absorption spectra of gold nanorods prepared with different amounts (0.65 mL、0.8 mL、1 mL、1.1 mL) of seed

Fig.6 TEM images of gold nanorods synthesized by different contents (a: 0.65 mL、b: 0.8 mL、c: 1 mL、d: 1.1 mL) of seed (Scale bars: 100 nm)

Table 2 Effect of seeds contents on length, diameter, aspect ratio, longitudinal SPR and yield of gold nanorods

Fig.7 Absorption spectra of gold nanorods prepared with different amounts (7 mL、9 mL、11 mL、13 mL) of CTAB

Fig.8 TEM images of gold nanorods synthesized by different contents (a: 7 mL、b: 9 mL、c: 11 mL、d: 13 mL) of CTAB (Scale bars: 100 nm)

Table 3 Effect of CTAB amounts on length, diameter, aspect ratio, longitudinal SPR and yield of gold nanorods

Fig.9 Absorption spectrum of gold nanorods prepared under optimized conditions

Fig.10 TEM images of gold nanorods prepared under optimized conditions

Fig.11 Length distribution histogram of gold nanorods

Fig.12 Roman enhanced spectrum of different concentrations of thiram solution on gold nanorods substrate (a) and the relationship between the intensity of the 1374 cm^-1 peak and thiram concentrations (b)

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