Synthesis of Multibranched Gold Nanoechinus Using a Gemini Cationic Surfactant and Its Application for Surface Enhanced Raman Scattering

Abstract

High-yield multibranched Au nanoechinus possessing lengthy and dense branched nanorods on the surface were synthesized using a seed-mediated surfactant-directed approach in the presence of gemini cationic surfactant N,N,N'N'-tetramethyl-N,N'-ditetradecylethane-1,2-diaminium bromide (C14C2C14Br2), HAuCl4, AgNO3, and ascorbic acid. C14C2C14Br2 surfactant provides a versatile template in designing the unique morphology of Au nanoechinus with the assistance of AgNO3. UV-vis spectroscopic analysis proves that Au nanoechinus possess a unique intense broad localized surface plasmon resonance (LSPR) peak, which extends from 400 to 1700 nm in the NIR region making a highly potential platform for biomedical applications. Systematic time-dependent TEM, UV-vis-NIR, and XRD analysis were performed to monitor the morphological evolution of multibranched Au nanoechinus. It was found that the surface of branched nanorods of Au NE preferentially grew along (111) crystal planes. Furthermore, as-synthesized Au nanoechinus shows excellent SERS enhancement ability for dopamine inside HeLa cells.

Au–Ag Nanoflower Catalysts with Clean Surfaces for Alcohol Oxidation

“…Noble‐metal nanocrystals (NCs) are very important for applications in fields such as electrochemistry, electronics, magnetic storage, catalyst, and biotechnology . The properties of a metal NC are dependent on its morphology, including size and shape .…”

“…Noble-metal nanocrystals (NCs) are very important for applications in fields such as electrochemistry,e lectronics, magnetic storage, catalyst, andb iotechnology. [1][2][3][4][5][6][7][8][9][10][11][12][13] The properties of a metal NC are dependento ni ts morphology, including size and shape. [1][2][3][4][5][6] Therefore, many methods for the preparation of NCs with various shapes, such as nanoflowers, [14][15][16][17] nanocubes, [18][19][20][21] nanorods, [22][23][24] and nanowires, [25][26][27][28][29][30][31] with the desired properties have been reported.…”

Gold nanorod–based poly(lactic-co-glycolic acid) with manganese dioxide core–shell structured multifunctional nanoplatform for cancer theranostic applications

“…34 AuNRs with different ARs have different absorption wavelengths that can be used for a variety of purposes, such as PTT. 35,36 However, because of some drawbacks of NIR PTT, the RF irradiation has been used in this study for AuNRs-based hyperthermia.…”

Bovine serum albumin assisted preparation of ultra-stable gold nanoflowers and their selective Raman response to charged dyes

“…[6][7][8] A general strategy to synthesize Au NFs is to carry out the growth of Au nanoparticles (NPs) in the presence of shape-directing agents, which can preferentially adsorb onto specic crystal planes and thus direct the anisotropic growth of NPs along the uncapped facets. A variety of agents, such as surfactants, 9,10 polymers, 11 and biomolecules with active groups that allow their anchoring onto the specic planes, 12 have been proven to be effective to direct the growth of Au NFs. However, it is documented that Au NFs are readily to go ripening and become spherical in shape, especially in presence of chloride ions and/or under acidic pH.…”