金纳米棒的制备及其表面增强拉曼活性研究
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摘要
采用种子生长法制备不同长径比金纳米棒,通过单一调控AgNO_3的用量制备了长度为(80±18)nm、长径比为2.1~4.0、长轴表面等离子体共振吸收波长为600~900 nm的金纳米棒;研究AgNO_3诱导生长剂对金纳米棒的影响,探讨金纳米棒的生长机理.以对巯基苯胺作为探针分子,运用拉曼光谱对不同长径比金纳米棒的表面增强拉曼活性进行研究.结果表明,吸收波长为790 nm的金纳米棒的表面增强拉曼活性最强,这主要是因为拉曼光谱仪的激发波长与金纳米棒的长轴表面等离子体共振吸收波长实现匹配.该研究成果为不同长径比金纳米棒的SERS活性研究提供了重要的理论基础.
Gold nanorods were prepared by seed-mediated growth method. The gold nanorods which was(80±18) nm in length with different aspect ratios of 2.1-4.0 were prepared with control of the dosage of AgN03. The longitudinal surface plasmon resonance(LSPR) absorption wavelength can be adjusted to600-900 nm. The formation mechanism of gold nanorods was discussed with description of the dosage of growth guide agent AgNO_3. Moreover, aminothiophenol was selected as a model probe to evaluate the surface-enhanced Raman scattering(SERS) activity of gold nanorods with different aspect ratios. The results show that the 790 nm gold nanorods can serve as the most efficient SERS substrates as the LSPR absorption wavelengths of the gold nanorods are matched with the excitation wavelengths of Raman spectrometer. The results provide an important theoretical foundation for the SERS activity research of gold nanorods.
Gold nanorods were prepared by seed-mediated growth method. The gold nanorods which was(80±18) nm in length with different aspect ratios of 2.1-4.0 were prepared with control of the dosage of AgN03. The longitudinal surface plasmon resonance(LSPR) absorption wavelength can be adjusted to600-900 nm. The formation mechanism of gold nanorods was discussed with description of the dosage of growth guide agent AgNO_3. Moreover, aminothiophenol was selected as a model probe to evaluate the surface-enhanced Raman scattering(SERS) activity of gold nanorods with different aspect ratios. The results show that the 790 nm gold nanorods can serve as the most efficient SERS substrates as the LSPR absorption wavelengths of the gold nanorods are matched with the excitation wavelengths of Raman spectrometer. The results provide an important theoretical foundation for the SERS activity research of gold nanorods.
引文
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[2]刘津升.基于金纳米棒结构的合成及其等离激元特性研究[D].南京:南京航空航天大学,2015.
[3]PEREZ-JUSTE J,PASTORIZA-SANTOS I,LIZMARZAN L M,et al.Gold nanorods:Synthesis,characterization and applications[J].Coordination Chemistry Reviews,2005,249(17):1870-1901.
[4]VON MALTZAHN G,CENTRONE A,PARK J H,et al.SERS-coded gold nanorods as a multifunctional platform for densely multiplexed near-infrared imaging and photothermal heating[J].Advanced Materials,2009,21(31):3175-3180.
[5]SU X,WANG Y,WANG W,et al.Phospholipid encapsulated AuNR@Ag/Au nanosphere SERS tags with environmental stimulus responsive signal property[J].Acs Applied Materials&Interfaces,2016,8(16):10201-10211.
[6]麻鹏,肖湘云,聂立波.金纳米棒的制备与影响因素研究[J].湖南工业大学学报,2014,28(4):18-21.
[7]JANA N R,GEARHEART L,MURPHY C J.Seedmediated growth approach for shape-controlled synthesis of spheroidal and rod-like gold nanoparticlesusing a surfactant template[J].Advanced Materials,2001,13(18):1389.
[8]高倩,钱勇,夏炎,等.一种制备高长径比金纳米棒的新方法[J].化学学报,2011,69(14):1617-1621.
[9]HAISS W,THANH N T,AVEYARD J,et al.Determination of size and concentration of gold nanoparticles from UV-vis spectra[J].Analytical Chemistry,2007,79(11):4215-4221.
[10]ORENDORFF C J,MURPHY C J.Quantitation of metal content in the silver-assisted growth of gold nanorods[J].The Journal of Physical Chemistry B,2006,110(9):3990-3994.
[11]CAO J,SUN T,GRATTAN K T V.Gold nanorodbased localized surface plasmon resonance biosensors:A review[J].Sensors and Actuators B:Chemical,2014,195:332-351.
[12]鲁闻生,王海飞,张建平,等.金纳米棒的制备、生长·机理及纯化[J].化学进展,2015,27(7):785-793.