可调谐金纳米棒近红外光谱特性及表面增强拉曼特性
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摘要
采用种子生长法制备金纳米棒,通过改变制备过程中硝酸银、金种子以及盐酸溶液的配比,制备得到了4种不同长径比的金纳米棒颗粒样品,用透射电子显微镜测定了样品形貌,还测定了样品的近红外吸收光谱及拉曼增强特性。结果表明,随着金纳米棒长径比的增大,纵向吸收峰会发生红移,而横向吸收峰几乎不变。在波长为785 nm的激光照射下,以金纳米棒作为表面拉曼增强基底,罗丹明6 G分子的拉曼信号得到了显著增强。
In this paper, gold nanorods are fabricated by using seed-mediated growth method. Four kinds of gold nanorods particle samples with different length-diameter ratios are prepared through changing proportion among AgNO_3, Au seeds, and HCl solution. The morphology of the samples are measured by transmission electron microscope(TEM), and the near infrared absorption spectra and Raman enhancement characteristics of the samples are also measured. The results show that with the increase of the length-diameter ratio gold nanorods, the longitudinal surface plasmon resonance(LSPR) absorption peak shifts red while the transverse surface plasmon resonance(TSPR) absorption peak almost remains unchanged. By using the gold nanorods as the surface-enhanced Raman substrate, Raman signal of Rhodamine 6 G molecule irradiated by 785 nm laser is significantly enhanced. These results provide a reference and a basis for the application of gold nanorods in the fields of bio-molecular recognition and detection in the near infrared spectrum.
In this paper, gold nanorods are fabricated by using seed-mediated growth method. Four kinds of gold nanorods particle samples with different length-diameter ratios are prepared through changing proportion among AgNO_3, Au seeds, and HCl solution. The morphology of the samples are measured by transmission electron microscope(TEM), and the near infrared absorption spectra and Raman enhancement characteristics of the samples are also measured. The results show that with the increase of the length-diameter ratio gold nanorods, the longitudinal surface plasmon resonance(LSPR) absorption peak shifts red while the transverse surface plasmon resonance(TSPR) absorption peak almost remains unchanged. By using the gold nanorods as the surface-enhanced Raman substrate, Raman signal of Rhodamine 6 G molecule irradiated by 785 nm laser is significantly enhanced. These results provide a reference and a basis for the application of gold nanorods in the fields of bio-molecular recognition and detection in the near infrared spectrum.
引文
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[16] WANG J,HUANG L Q,YUAN L,et al.Silver nanostructure arrays abundant in sub-5 nm gaps as highly Raman-enhancing substrates[J].Applied Surface Science,2012,258(8):3 519-3 523.
[2] LUO Y,ZHOU Y D,ZOU S L,et al.Dielectric domain distribution on Au nanoparticles revealed by localized surface plasmon resonance[J].J Mater Chem C,2018,6(44):12 038-12 044.
[3] GARAI M,GAO N Y,XU Q H.Single-particle spectroscopic studies on two-photon photoluminescence of coupled Au nanorod dimers[J].J Phys Chem C,2018,122(40):23 102-23 110.
[4] WILLETS K A,DUYNE R P V.Localized surface plasmon resonance spectroscopy and sensing[J].Ann Rrev Phys Chem,2007,58(1):267-297.
[5] KELLY K L,CORONADO E,ZHAO L L,et al.The optical properties of metal nanoparticles:The influence of size,shape,and dielectric environment[J].J Phys Chem B,2002,107(3):668-677.
[6] FUTAMATA M,MARUYAMA Y,ISHIKAWA M.Local electric field and scattering cross section of Ag nanoparticles under surface plasmon resonance by finite difference time domain method[J].J Phys Chem B,2003,107(31):7 607-7 617.
[7] TADIMETY A,ZHANG Y C,KREADY K M,et al.Design of peptide nucleic acid probes on plasmonic gold nanorods for detection of circulating tumor DNA point mutations[J].Biosensors and Bioelectronics,2019,130:236-244.
[8] MANIVASAGAN P,HOANG G,MOORTHY M S,et al.Chitosan/fucoidan multilayer coating of gold nanorods as highly efficient near-infrared photothermal agents for cancer therapy[J].Carbohydrate Polymers,2019,211:360-369.
[9] WU L M,LIN B Y,YANG H,et al.Enzyme-responsive multifunctional peptide coating of gold nanorods improves tumor targeting and photothermal therapy efficacy[J].Acta Biomaterialia,2019,86:363-372.
[10] MILIKEN S,FRASER J,POIRIER S,et al.Self-assembled vertically aligned Au nanorod arrays for surface-enhanced Raman scattering (SERS) detection of cannabinol[J].Spectrochimica Acta Part A,2018,196:222-228.
[11] KANG H,JEONG S,PARK Y,et al.Near-infrared SERS nanoprobes with plasmonic Au/Ag hollow-shell assemblies for in vivo multiplex detection[J].Advanced Functional Materials,2013,23(30):3 719-3 727.
[12] MUSKENS O L,BACHELIER G,FATTI N D,et al.Quantitative absorption spectroscopy of a single gold nanorod[J].Phys Chem C,2008,112(24):8 917-8 921.
[13] NIKOOBAKHT B,EL-SAYED M A.Preparation and growth mechanism of gold nanorods (NRs) using seed-mediated growth method[J].Chem of Mater,2003,15(10):1 957-1 962.
[14] YE X C,ZHENG C,CHEN J,et al.Using binary surfactant mixtures to simultaneously improve the dimensional tunability and monodispersity in the seeded growth of gold nanorods[J].Nano Lett,2013,13(2):765-771.
[15] BRIOUDE A,JIANG X C,PILENI M P.Optical properties of gold nanorods:DDA simulations supported by experiments[J].J Phys Chem B,2005,109(27):13 138-13 142.
[16] WANG J,HUANG L Q,YUAN L,et al.Silver nanostructure arrays abundant in sub-5 nm gaps as highly Raman-enhancing substrates[J].Applied Surface Science,2012,258(8):3 519-3 523.