Ultra-small rhenium nanoparticles immobilized on DNA scaffolds: An excellent material for surface enhanced Raman scattering and catalysis studies

作者：Anantharaj S; Sakthikumar K; Elangovan Ayyapan; Ravi G; Karthik T; Kundu Subrata^*

来源：Journal of Colloid and Interface Science, 2016, 483: 360-373.

DOI：10.1016/j.jcis.2016.08.046

• Rhenium
• DNA
• Nanoparticles
• SERS
• Catalysis

Highly Sensitive and ultra-small Rhenium (Re) metal nanoparticles (NPs) were successfully stabilized in water by the staging and fencing action of the versatile biomolecule DNA that resulted in two distinct aggregated chain-like morphologies with average grain sizes of 1.1 +/- 0.1 nm and 0.7 +/- 0.1 nm for the very first time within a minute of reaction time. Re NPs are formed by the borohydride reduction of ammonium perrhenate (NH4ReO4) in the presence of DNA at room temperature (RT) under stirring. The morphologies were controlled by carefully monitoring the molar ratio of (NH4ReO4) and DNA. The synthesized material was employed in two potential applications: as a substrate for surface enhanced Raman scattering (SERS) studies and as a catalyst for the reduction of aromatic nitro compounds. SERS study was carried out by taking methylene blue (MB) as the probe and the highest SERS enhancement factor (EF) of 2.07 x 10(7) was found for the aggregated chain-like having average grain size of 0.7 +/- 0.1 nm. Catalytic reduction of 4-nitro phenol (4-NP), 2-nitro phenol (2-NP) and 4-nitroaniline (4-NA) with a rate constant

• 出版日期2016-12-1