Abstract
Seeded growth of gold nanorods (NRs) has been accomplished in a micellar medium containing mixed surfactants or a high salt concentration. Cetyl trimethylamoniumbromide (CTAB) forms micelles upon which the growth of rod shaped gold nanoparticles occurs. AgNO3 is introduced into the growth solution to enhance the formation of NRs. The roles of non-ionic surfactants such as Tween and Triton, and of electrolytes such as sodium chloride and potassium chloride have been examined. As the concentration of these additives in the growth solution is increased, the aspect ratio of the NRs increases to a critical limit, after which it decreases again. Upon carefully controlling the content of Triton X-100 or Tween 20 in the growth solution, these non-ionic surfactants assisted in fine-tuning the shape of gold NRs (e.g. rectangular or “dogbone”). The growth pattern of the NRs fits into the model of a soft template formed by the mixture of CTAB and non-ionic surfactants.
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References
Prasad PN (2004) Nanophotonics. Wiley–Interscience, New York
Daniel M-C, Astruc D (2004) Gold nanoparticles: assembly, supramolecular chemistry, quantum-size-related properties, and applications toward biology, catalysis, and nanotechnology. Chem Rev 104:293–346
Yu Y-Y, Chang S-S, Lee C-L, Wang CRC (1997) Gold nanorods: electrochemical synthesis and optical properties. J Phys Chem B 101:6661–6664
Nikoobakht B, El-Sayed MA (2003) Surface-enhanced Raman scattering studies on aggregated gold nanorods. J Phys Chem A 107:3372–3378
Pérez-Juste J, Pastoriza-Santos I, Liz-Marzán LM, Mulvaney P (2005) Gold nanorods: synthesis, characterization and applications. Coord Chem Rev 249:1870–1901
Murphy CJ, Sau TK, Gole AM, Orendorff CJ, Gao J, Gou L, Hunyadi SE, Li T (2005) Anisotropic metal nanoparticles: synthesis, assembly, and optical applications. J Phys Chem B 109:13857–13870
Salem AK, Searson PC, Leong KW (2003) Multifunctional nanorods for gene delivery. Nat Mater 2:668–671
Hsieh S, Meltzer S, Wang CRC, Requicha AAG, Thompson ME, Koel BE (2002) Imaging and manipulation of gold nanorods with an atomic force microscope. J Phys Chem B 106:231–234
Schultz DA (2003) Plasmon resonant particles for biological detection. Curr Opin Biotechnol 14:13–22
Katz E, Willner I (2004) Nanobiotechnology: integrated nanoparticle-biomolecule hybrid systems: synthesis, properties, and applications. Angew Chem Int Ed Engl 43:6042–6108
Mohamed MB, Volkov V, Link S, El-Sayed MA (2000) The ‘lightning’ gold nanorods: fluorescence enhancement of over a million compared to the gold metal. Chem Phys Lett 317:517–523
Jana NR, Gearheart L, Obare SO, Murphy CJ (2002) Anisotropic chemical reactivity of gold spheroids and nanorods. Langmuir 18:922–927
Imura K, Nagahara T, Okamoto H (2004) Plasmon mode imaging of single gold nanorods. J Am Chem Soc 126:12730–12731
Tao A, Kim F, Hess C, Goldberger J, He R, Sun Y, Xia Y, Yang P (2003) Langmuir–Blodgett silver nanowire monolayers for molecular sensing using surface-enhanced Raman spectroscopy. Nano Lett 3:1229–1233
Ah CS, Hong SD, Jang D-J (2001) Preparation of AucoreAgshell nanorods and characterization of their surface plasmon resonances. J Phys Chem B 105:7871–7873
Kim F, Song JH, Yang P (2002) Photochemical synthesis of gold nanorods. J Am Chem Soc 124:14316–14317
Zhu YJ, Hu XL (2003) Microwave-polyol preparation of single-crystalline gold nanorods and nanowires. Chem Lett 32:1140–1141
Gole A, Murphy CJ (2004) Seed-mediated synthesis of gold nanorods: role of the size and N of the seed. Chem Mater 16:3633–3640
Gole A, Murphy CJ (2005) Polyelectrolyte-coated gold nanorods: synthesis, characterization and immobilization. Chem Mater 17:1325–1330
Jana NR, Gearheart L, Murphy CJ (2001) Wet chemical synthesis of high aspect ratio cylindrical gold nanorods. J Phys Chem B 105:4065–4067
Obare S, Jana NR, Murphy CJ (2001) Preparation of polystyrene- and silica-coated gold nanorods and their use as templates for the synthesis of hollow nanotubes. Nano Lett 1:601–603
Schönenberger C, van der Zande BMI, Fokkink LGJ, Henny M, Schmid C, Krüger M, Bachtold A, Huber R, Birk H, Staufer U (1997) Template synthesis of nanowires in porous polycarbonate membranes: electrochemistry and morphology. J Phys Chem B 101:5497–5505
Nikoobakht B, El-Sayed MA (2003) Preparation and growth mechanism of gold nanorods (NRs) using seed-mediated growth method. Chem Mater 15:1957–1962
Pérez-Juste J, Liz-Marzán LM, Carnie S, Chan DYC, Mulvaney P (2004) Electric-field-directed growth of gold nanorods in aqueous surfactant solutions. Adv Funct Mater 14:571–579
Gao J, Bender CM, Murphy CJ (2003) Dependence of the gold nanorod aspect ratio on the nature of the directing surfactant in aqueous solution. Langmuir 19:9065–9070
Ruiz CC, Aguiar J (2000) Interaction, stability, and microenvironmental properties of mixed micelles of Triton X100 and n-alkyltrimethylammonium bromides: influence of alkyl chain length. Langmuir 16:7946–7953
Busbee BD, Obare SO, Murphy CJ (2003) An improved synthesis of high-aspect-ratio gold nanorods. Adv Mater 15:414–416
Jana NR, Gearheart L, Murphy CJ (2001) Seed-mediated growth approach for shape-controlled synthesis of spheroidal and rod-like gold nanoparticles using a surfactant template. Adv Mater 13:1389–1393
Sau TK, Murphy CJ (2004) Seeded high yield synthesis of short Au nanorods in aqueous solution. Langmuir 20:6414–6420
Gou L, Murphy CJ (2005) Fine-tuning the shape of gold nanorods. Chem Mater 17:3668–3672
Link S, Mohamed MB, El-Sayed MA (1999) Simulation of the optical absorption spectra of gold nanorods as a function of their aspect ratio and the effect of the medium dielectric constant. J Phys Chem B 103:3073–3077
Ghosh SK, Kundu S, Mandal M, Nath S, Pal T (2003) Studies on the evolution of silver nanoparticles in micelle by UV-photoactivation. J Nanoparticle Res 5:577–587
Sau TK, Pal A, Jana NR, Wang ZL, Pal T (2001) Size controlled synthesis of gold nanoparticles using photochemically prepared seed particles. J Nanoparticle Res 3:257–261
Jana NR (2005) Gram-scale synthesis of soluble, near-monodisperse gold nanorods and other anisotropic nanoparticles. Small 1:875–882
Evans DF (1988) Self-organization of amphiphiles. Langmuir 4:3–12
Mosquera V, del Rio JM, Attwood D, Garcia M, Jones MN, Prieto G, Suarez MJ, Sarmiento F (1998) A study of the aggregation behavior of hexyltrimethylammonium bromide in aqueous solution. J Colloid Interf Sci 206:66–76
Aswal VK, Goyal PS (1998) Mixed micelles of alkyltrimethylammonium halides A small-angle neutron scattering study. Physica B 245:73–80
Yuan HZ, Zhao S, Cheng GZ, Zhang L, Miao XJ, Mao SZ, Yu JY, Shen LF, Du YR (2001) Mixed micelles of Triton X-100 and cetyl trimethylammonium bromide in aqueous solution studied by 1H NMR. J Phys Chem B 105:4611–4615
Razavizadeh BM, Mousavi-Khoshdel M, Gharibi H, Behjatmanesh-Ardakani R, Javadian S, Sohrabi B (2004) Thermodynamic studies of mixed ionic/nonionic surfactant systems. J Colloid Interf Sci 276:197–207
Cappelaere E, Cressely R (1998) Rheological behavior of an elongated micellar solution at low and high salt concentrations. Colloid Polym Sci 276:1050–1056
Ionescu LG, Do Aido THM, Kid BJ (1989) Aggregation of cetyltrimethylammonium bromide (CTAB) in aqueous solutions containing sodium chloride. Bol Soc Chil Quim 35:105–111
Olsson U, Soderman O, Guering P (1986) Characterization of micellar aggregates in viscoelastic surfactant solutions—a nuclear-magnetic-resonance and light-scattering study. J Phys Chem 90:5223–5232
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Yong, KT., Sahoo, Y., Swihart, M.T. et al. Templated Synthesis of Gold Nanorods (NRs): The Effects of Cosurfactants and Electrolytes on the Shape and Optical Properties. Top Catal 47, 49–60 (2008). https://doi.org/10.1007/s11244-007-9030-7
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DOI: https://doi.org/10.1007/s11244-007-9030-7