Sonochemical Formation of Single‐Crystalline Gold Nanobelts

Abstract

Benign belts: Single‐crystalline gold nanobelts (see SEM image) can be synthesized by ultrasound irradiation of an aqueous solution of HAuCl4 containing α‐D‐glucose as a biological directing agent. The gold nanobelts are typically 30–50 nm wide and several micrometers long. The method is simple, rapid, and avoids hazardous substances.

Applications of Ultrasound to the Synthesis of Nanostructured Materials

“…M n ðM ¼ noble metalÞ (7) Various metallic colloids have been prepared via the sonochemical route by many research groups. [24][25][26][27][28][29][30] Among them, Grieser and coworkers carried out a systematic study on sonochemical reduction to unveil the complex reduction mechanism and to understand the effect of each parameter (e.g., time, concentration, ultrasonic frequency, and different organic additives) on particle size and shape. [27,[31][32][33][34] One of the interesting observations they reported is that particle size is inversely dependent upon alcohol concentration and alkyl chain length.…”

“…Sonochemical reduction of noble metal salts has advantages over other traditional reduction methods (e.g., sodium borohydride, hydrogen, and alcohol): no chemical reducing agent is needed, the reaction rates are reasonably fast, and very small metal particles are produced. [24][25][26][27][28][29] As discussed earlier, sonolysis of water accounts for these sonochemical reductions; more specifically, sonochemically generated HÁ radicals are considered to act as reductants, as summarized below; often, organic additives (e.g., 2-propanol or surfactants) are added to produce a secondary radical species, which can significantly promote the reduction rate:…”

Sonochemical synthesis of nanomaterials

“…Ultrasonic irradiation of HAuCl 4 solution containing a-D-glucose produced gold nanobelts with a width of 30-50 nm and a length of several micrometres. 41 These gold nanobelts are formed through 3 steps: (1) formation of gold nanoparticles via sonochemical reduction, (2) aggregation and room-temperature temperature sintering of gold nanoparticles directed by a-D-glucose, and (3) further growth along the Au[111] direction with recrystallization finally yielding the isolated single-crystalline gold nanobelts. Highly fluorescent, stable, and water-soluble Ag nanoclusters (diameter less than 2 nm) have been successfully prepared by sonication of aqueous AgNO 3 solutions with dissolved polymethylacrylic acid (PMAA) (Fig.…”

La(OH)3 and La2O3 Nanobelts—Synthesis and Physical Properties

“…[1,2] Nanobelts, with a rectangular cross section and well-defined faceted surfaces, enable the observation of unique optical-confinement, microcavity, catalysis, and piezoelectricity effects. [3][4][5][6][7][8][9] According to classical waveguide theory, waveguides of different cross sections will exhibit different transverse optical modes.[10] Nanobelts with rectangular cross sections have been used as effective FabryPerot microcavities for lasing. [11] In the past few years, fieldeffect transistors, [12] nanometer-sized ultrasensitive gas sensors, [13] resonators, [14] and cantilevers [15] have been fabricated based on individual nanobelts.…”