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Gold Nano-Island Platforms for Localized Surface Plasmon Resonance Sensing: A Short Review.

Author(s): Badilescu S, Raju D, Bathini S, Packirisamy M

Nano-islands are entities (droplets or other shapes) that are formed by spontaneous dewetting (agglomeration, in the early literature) of thin and very thin metallic (especially gold) films on a substrate, done by post-deposition heating or by using other s...

Article GUID: 33066088
Lab-On-A-Chip for the Development of Pro-/Anti-Angiogenic Nanomedicines to Treat Brain Diseases.

Author(s): Subramaniyan Parimalam S, Badilescu S, Sonenberg N, Bhat R, Packirisamy M

Int J Mol Sci. 2019 Dec 05;20(24): Authors: Subramaniyan Parimalam S, Badilescu S, Sonenberg N, Bhat R, Packirisamy M

Article GUID: 31817343
Nano-Bio Interactions of Extracellular Vesicles with Gold Nanoislands for Early Cancer Diagnosis.

Author(s): Bathini S, Raju D, Badilescu S, Kumar A, Ouellette RJ, Ghosh A, Packirisamy M

Res (Wash D C). 2018;2018:3917986 Authors: Bathini S, Raju D, Badilescu S, Kumar A, Ouellette RJ, Ghosh A, Packirisamy M

Article GUID: 31549028
Tuning of Morphology and Stability of Gold Nanostars Through pH Adjustment.

Author(s): Kumar R, Badilescu S, Packirisamy M

J Nanosci Nanotechnol. 2019 Aug 01;19(8):4617-4622 Authors: Kumar R, Badilescu S, Packirisamy M

Article GUID: 30913757
The effect of hydrogen nanobubbles on the morphology of gold-gelatin bionanocomposite films and their optical properties.

Author(s): Alsawafta M, Badilescu S, Truong VV, Packirisamy M

Nanotechnology. 2012 Feb 17;23(6):065305 Authors: Alsawafta M, Badilescu S, Truong VV, Packirisamy M

Article GUID: 22248640
Title:Tuning of Morphology and Stability of Gold Nanostars Through pH Adjustment.
Authors:Kumar R,  Badilescu S,  Packirisamy M
Link:https://www.ncbi.nlm.nih.gov/pubmed/30913757?dopt=Abstract
Category:J Nanosci Nanotechnol
PMID:30913757
Dept Affiliation: ENCS
1 Optical-Bio Micro Systems Laboratory, Mechanical, Industrial and Aerospace Engineering Department, Concordia University, 1455 De Maisonneuve Blvd. W. Montréal, QC, H3G1M8, Canada.

Description:

Tuning of Morphology and Stability of Gold Nanostars Through pH Adjustment.

J Nanosci Nanotechnol. 2019 Aug 01;19(8):4617-4622

Authors: Kumar R, Badilescu S, Packirisamy M

Abstract

In this study, the morphology and stability of gold nanostars (AuNSs) were investigated under different pH environments. The surface morphologies and plasmonic properties were observed for nanostars (NSs) deposited on glass substrates, using SEM and ultraviolet and visible (UV-Vis) spectroscopy. It is found that gold nanostars can be readily stabilized just by adjusting the initial pH condition of the growth solution. The particle size distribution of gold nanostars under different pH environments has been investigated using UV-Vis spectroscopy and found to be highly dependent on pH. At the optimal pH of 11, the gold nanostars are highly monodisperse, they have longer branches and the Au Localized Surface Plasmon Resonance band (LSPR) at 720 nm. For other pH conditions, particles are non-uniform and polydisperse, showing a red-shift of the plasmon peak due to aggregation and a large particle size distribution. Time-dependent UV-Vis spectra studies hypothesize the pH dependent stabilization mechanism, where the formation and stabilization of AuNS were affected greatly by the aggregation induced by pH of the growth solution. The information obtained in this study can be used to design stable gold nanostars with longer shelf life for biosensing applications.

PMID: 30913757 [PubMed - in process]