Probing Silver Deposition on Single Gold Nanorods by Their Acoustic Vibrations

Abstract

Orrit, M. (2014). Probing silver deposition on single gold nanorods by their acoustic vibrations. Nano Letters, 14(2), 915-922.

Acoustic vibrations of metal nano-objects: Time-domain investigations

“…The general excellent agreement on period measurement obtained for different shapes, i.e., spheres, cubes and prisms, has to be related to the weak influence of the environment on the vibration mode frequency demonstrated in ensemble measurements (Section 4.1). Results obtained on single core-shell Au-Ag nanorods [250] confirm this agreement, showing very similar behavior of the fundamental breathing and extensional mode frequencies with the material volume as previous ensemble measurements on similar systems (Fig. 18, Au-Ag and Au-Pd nanorods [61,63] and Au-Ag bipyramids [109]).…”

“…Time-domain acoustic vibrations of individual nano-objects have been extensively studied for various different shapes: gold spheres [68], dumbbells [169], rods [70,234,249,250], prisms [108], rings [83] or wires [67], and silver cubes [69,248] or wires [55,69]. Different particle environments were explored using particles deposited (by spin-coating a colloidal solution) or fabricated on a substrate (by nanosphere or electron beam lithography), embedded in sub-micron thick polymer film, or optically trapped in a liquid, or suspended over a trench [55,[67][68][69][70]108,169,234,247,249,248].…”

Size Characterisation Method and Detection Enhancement of Plasmonic Nanoparticles in a Pump–Probe System

“…Moreover, a careful choice of the probe wavelength allows to "turn off" the response of specific particles. Optimising the generation and detection capabilities of nanoparticles might open up the possibility to use nanoparticles as sources/detectors of ultrasounds for cell imaging, allowing a considerable enhancement of the lateral resolution or mass-loading sensors where the main vibrational mode is shifted due to the change of the medium mechanical properties [35].…”

Sub-monolayer silver loss from large gold nanospheres detected by surface plasmon resonance in the sigmoidal region

“…16,17 Microscopic methods such as TEM, electron tomography, and acoustic vibrations also require careful purification of samples. 15,[18][19][20] In contrast, spectroscopic measurements such as surface plasmon resonance (SPR) measurements may be used to accurately characterize nanosilver, 10,[21][22][23][24][25] although to date their application to surface silver loss determination has been limited. 19,23 These considerations make evident the importance of developing a holistic approach with which the loss of surface silver from nanosilver can be conveniently and fiducially detected in controlled environments without the burden of excessive purification.…”

“…Although silver shell -gold core nanostructures with various silver thicknesses have been synthesized and studied theoretically in the past, dating back to the 1950s, 18,20,[26][27][28][29][30][31][32] S-AguNSs have not been previously reported, experimentally or theoretically. To mimic real situations, we emulated the loss of surface silver using mild chemical etching and Xray irradiation during which no recoating was observed.…”