Rational design and SERS properties of side-by-side, end-to-end and end-to-side assemblies of Au nanorods

Zhong, Lu-Bin; Zhou, Xi; Bao, Shixiong; Shi, Yanfeng; Wang, Yan; Hong, Shimin; Huang, Yuancan; Wang, Xiang; Xie, Zhaoxiong; Zhang, Qiqing

doi:10.1039/c1jm11193k

Cited by 68 publications

(58 citation statements)

References 64 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Previously reported works use AuNRs with small organic ligands or polymers attached on their surface with a sulfur bonding, and exploit, either the solvent selectivity, or the site-specifi c interaction of the ligands stabilizing the NRs to achieve their self-assembling. [ 5,6 ] Besides, there is also an increasing interest for the NP welding. This interest is driven by both the fundamental aspect of the phenomena leading to the welding of nano-objects [ 7,8 ] and the potential application of the nanoscale welding to the bottom-up fabrication.…”

Section: Simona C Laza * Nicolas Sanson * Cécile Sicard-roselli mentioning

confidence: 99%

Selective Cold Welding of Colloidal Gold Nanorods

Laza

Sanson

Sicard-Roselli

et al. 2013

Part & Part Syst Charact

View full text Add to dashboard Cite

A new cold nanowelding technique for cetyltrimethylammonium bromide (CTAB)‐stabilized colloidal nanorods in water is reported. This technique leads to the formation of micrometric nanowires by end‐to‐end self‐organization and welding of nanorods. This cold welding strategy could be generally applicable to colloidal nanoparticles and opens new outlooks for the bottom‐up fabrication of nanodevices using colloidal building blocks.

show abstract

Section: Simona C Laza * Nicolas Sanson * Cécile Sicard-roselli mentioning

confidence: 99%

Selective Cold Welding of Colloidal Gold Nanorods

Laza

Sanson

Sicard-Roselli

et al. 2013

Part & Part Syst Charact

View full text Add to dashboard Cite

show abstract

“…Treating the tip region of the NRs with charged thiol molecules can enable the preparation tip-assembled superstructures via electrostatic interactions. 21 In this work the self-assembly of region-selectively surface modified patchy gold nanorods and spherical gold nanoparticles is investigated. A robust two-step surface modification procedure was applied to prepare patchy gold nanorods with spatially inhomogeneous surface-ligands.…”

Section: Introductionmentioning

confidence: 99%

Assembling patchy nanorods with spheres: limitations imposed by colloidal interactions

et al. 2016

View full text Add to dashboard Cite

For gold nanorods the intrinsic shape-anisotropy offers the prospect of anisotropic assembly, provided their regionselective surface modification can be realized. Here we developed a nanorod with patchy surface chemistry, featuring positively charged molecules in the tip region and polymer molecules at the sides by careful control of molecule concentrations during ligand exchange. When these patchy nanorods are assembled with small negatively spherical particles, electric double layer interaction can direct the assembly of two nanospheres at the opposite ends of the nanorods. The PEG chains promote the selectivity of the procedure. As the size of the nanospheres increases, they start to shift towards the side of the nanorod due to increased van der Waals interaction. When the relative size of the nanospheres is even larger, only a single nanoshpere is assembled, but instead of the tip region, they are attached to side of the nanorods. The apparent cross-over of the region-selectivity can be interpreted in terms of colloidal interactions, i.e. the second spherical particle is excluded due to nanosphere-nanosphere electric double layer repulsion, while the large vdW attraction result in a side positioning of the single adsorbed spherical particle. The results underline the importance of absolute values of the different interaction strengths and length scales in the programmed assembly of pathy nanoscale building blocks.

show abstract

“…Only more recently with the progress in nanoscience has it become an active subject matter of SERS investigation. 4,8,[21][22][23] When it comes to one-dimensional (1D) metal oxide nanomaterials which typically exhibit a higher aspect ratio than noble metal nanorods of a comparable diameter, concerted SERS measurements on controlled nanomaterial substrates are even scarcer. Yet, the anisotropy of 1D nanomaterials can provide a higher degree of enhancement in localized electromagnetic fields through symmetry breaking and can thus be extremely beneficial for SERS.…”

mentioning

confidence: 99%

“…3,12 The threedimensional finite difference time domain (3D-FDTD) theory, calculating local electromagnetic fields of transition metal surfaces when compared to the free electron metals, has effectively explained the experimentally observed phenomena. 3,12,22,29 The increased electromagnetic fields of non-spherical particles are often referred to as the lighting rod effect near structures of high curvature on a surface. The large anisotropy of the ITO NRs (with an aspect ratio larger 1:375 (width:length)) used in our SERS measurements may intensify this effect even further, leading to higher SERS activity than their isotropic zero-dimensional counterparts and the two dimensional ITO thin films.…”

mentioning

confidence: 99%

Application of well-defined indium tin oxide nanorods as Raman active platforms

Zhao¹,

Guo²,

Song³

et al. 2012

Appl. Phys. Lett.

View full text Add to dashboard Cite

We determine the surface enhanced Raman (SER) capability of indium tin oxide nanorods (ITO NRs) whose physical, chemical, and optical properties are precisely and uniformly controlled during synthesis. We demonstrate that the Raman intensities observed from varying concentrations of the pure and mixed molecules of rhodamine 6G and 4 0 ,6-diamidino-2-phenylindole are much larger on ITO NRs relative to those measured on commercially available ITO-coated glass or Si. Our efforts signify the first attempt to assess the SER capability of precisely controlled metal oxide NRs and will be highly beneficial to many basic and applied Raman applications requiring exceptional detection sensitivity. Surface enhanced Raman spectroscopy (SERS) is a powerful analytical tool which has proven its usefulness as a very selective and sensitive surface measurement technique. [1][2][3][4][5][6] In SERS, the majority of the substrates used for surface enhancement effects involve nanoparticles, thin films, islands, and three-dimensional constructs of coinage metals such as Cu, Au, and Ag. 2,7-9 Identifying potential SERS-active substrates and understanding enhancement mechanisms for such substrates are critical to the field and, therefore, still remain a key area of SERS study. Although not as extensively explored as the aforementioned metals, some research efforts are made to obtain SERS of transition metals such as Pt, Rh, Pd, Fe, Co, and Ni. 3,10-13 And more recently, other systems involving either a metal oxide thin film or a hybrid system of a metal nanoparticle/metal oxide thin film have been demonstrated as SERS-active materials. 7,14-19 Plasmonic characteristics similar to those observed from noble metals are found in some transparent conducting metal oxides such as indium tin oxide, fluorine-doped tin oxide, and aluminum-doped zinc oxide. 18,20 Despite many leading efforts on this aspect, only a small subset of research discusses Raman enhancement effects observed from nanomaterials that are precisely controlled for their physical, chemical, optical, or electrical properties during synthesis. Controlling the exact size and structure of the nanomaterials has not been the primary focus of many previous SERS studies, and many of the studies involve random surface roughening of Raman substrates for desired surface enhancement effect. Only more recently with the progress in nanoscience has it become an active subject matter of SERS investigation. 4,8,[21][22][23] When it comes to one-dimensional (1D) metal oxide nanomaterials which typically exhibit a higher aspect ratio than noble metal nanorods of a comparable diameter, concerted SERS measurements on controlled nanomaterial substrates are even scarcer. Yet, the anisotropy of 1D nanomaterials can provide a higher degree of enhancement in localized electromagnetic fields through symmetry breaking and can thus be extremely beneficial for SERS.In this letter, we report the SERS activity of wellcontrolled, anisotropic indium tin oxide nanorods (ITO NRs) by evaluating their role in Rama...

show abstract

Rational design and SERS properties of side-by-side, end-to-end and end-to-side assemblies of Au nanorods

Cited by 68 publications

References 64 publications

Selective Cold Welding of Colloidal Gold Nanorods

Selective Cold Welding of Colloidal Gold Nanorods

Assembling patchy nanorods with spheres: limitations imposed by colloidal interactions

Application of well-defined indium tin oxide nanorods as Raman active platforms

Contact Info

Product

Resources

About