Electric‐Field‐Assisted Growth of Highly Uniform and Oriented Gold Nanotriangles on Conducting Glass Substrates

Abstract

Size and shape control is a critical problem in the utility of nanomaterials as their physical and chemical properties depend strongly on structural parameters. Optical properties [1][2][3] and catalysis [4] of metal nanoparticles (NPs) reflect the structure-dependence most dramatically. Nanotriangles (NTs) or nanoprisms are a new class of nanomaterials and their properties such as near-infrared (NIR) absorption, [5][6][7][8] anisotropic electrical conductivity [9] and strong enhancement of electric fields at the vertices [10] are expected to make them useful for a variety of applications in photonics and optoelectronics, information storage, optical sensing, [11] biological labeling, imaging, metal enhanced fluorescence [12,13] and surface-en-

Electric Field Assisted Growth of Highly Surface Enhanced Raman Active Gold Nanotriangles

“…We have done a range of control experiments to understand the various factors important in this process. 11 From these observations, we came into a conclusion that the temperature and the applied potential play important roles in the formation of the NTs. We optimized the experimental condition in order to yield oriented equilateral NTs.…”

“…The characterization of these NTs was done by optical absorption measurements, AFM, SEM, optical microscope and XRD (details are presented in Ref. [11]). Figure 1 shows the UV-vis spectra of the AuNPs (trace A) and NTs-coated ITO (trace B).…”

“…We optimized the experimental condition in order to yield oriented equilateral NTs. 11 Figure 2(C) shows the contact mode AFM image of the NPs-coated on the ITO surface. The NPs were slightly aggregated on the surface of ITO.…”

Artifacts in Atomic Force Microscopy of Biological Samples

“…they claim that the observed effect is due to local anodic oxidation, an artifact of Kelvin force microscopy. Another example is the work of Sajanlal and Pradeep, who presented the formation of well-aligned gold nanotriangle arrays on indium tin oxide substrate (Sajanlal & Pradeep, 2008), but Diao with coworkers state that those triangles are tip artifacts (Diao et al, 2009). The purpose of this chapter is to show different AFM artifacts relevant to biological specimens, explain their reasons and present a way to avoid them.…”

Light-controlled synthesis of uniform platinum nanodendrites with markedly enhanced electrocatalytic activity

“…Besides morphology, composition, and surface properties, the functionalities of nanomaterials are closely related to their particle size [6][7][8][9]. Despite the fact that size control over a series of nanomaterials has been realized, general sizecontrolled approaches applicable to various chemical growth processes are still restricted to seeding strategies [8,[10][11][12][13].Traditional seeding methods rely on the addition of a certain number of preformed seed particles to a reaction system giving well separated nucleation and growth steps, and resulting in the desired size and Nano Research 2013, 6(10): 720-725 …”