title: Ultra-small rhenium nanoparticles immobilized on DNA scaffolds: An excellent material for surface enhanced Raman scattering and catalysis studies.
abstract: 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±0.1nm and 0.7±0.1nm 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 2.07×10(7) was found for the aggregated chain-like having average grain size of 0.7±0.1nm. Catalytic reduction of 4-nitro phenol (4-NP), 2-nitro phenol (2-NP) and 4-nitroaniline (4-NA) with a rate constant value of 6×10(-2)min(-1), 33.83×10(-2)min(-1) and 37.4×10(-2)min(-1) have testified the excellent catalytic performance of our Re NPs immobilized on DNA. The overall study have revealed the capability of DNA in stabilizing the highly reactive Re metal at nanoscale and made them applicable in practice. The present route can also be extended to prepare one dimensional (1-D), self-assembled NPs of other reactive metals, mixed metals or even metal oxides for specific applications in water based solutions.
authors: Electrochemical Materials Science (ECMS) Division, CSIR-Central Electrochemical Research Institute (CECRI), Karaikudi 630006, Tamil Nadu, India.
authors: S
authors: S
authors: Anantharaj
authors: Electrochemical Materials Science (ECMS) Division, CSIR-Central Electrochemical Research Institute (CECRI), Karaikudi 630006, Tamil Nadu, India.
authors: K
authors: K
authors: Sakthikumar
authors: Electrochemical Materials Science (ECMS) Division, CSIR-Central Electrochemical Research Institute (CECRI), Karaikudi 630006, Tamil Nadu, India; Department of Chemistry, Kansas State University, Manhattan, KS 66506, USA.
authors: Ayyapan
authors: A
authors: Elangovan
authors: School of Physics, Alagappa University, Karaikudi 630006, Tamil Nadu, India.
authors: G
authors: G
authors: Ravi
authors: School of Physics, Alagappa University, Karaikudi 630006, Tamil Nadu, India.
authors: T
authors: T
authors: Karthik
authors: Electrochemical Materials Science (ECMS) Division, CSIR-Central Electrochemical Research Institute (CECRI), Karaikudi 630006, Tamil Nadu, India; Department of Materials Science and Mechanical Engineering, Texas A&M University, College Station, TX 77843, USA. Electronic address: skundu@cecri.res.in.
authors: Subrata
authors: S
authors: Kundu
mesh_terms: D000327:Adsorption; D000814:Aniline Compounds / Q000737:chemistry; D001894:Borohydrides / Q000737:chemistry*; D002384:Catalysis; D004247:DNA / Q000737:chemistry*; D006801:Humans; D007700:Kinetics; D053768:Metal Nanoparticles / Q000737:chemistry* / Q000648:ultrastructure; D008751:Methylene Blue / Q000737:chemistry; D009596:Nitrophenols / Q000737:chemistry; D010084:Oxidation-Reduction; D010316:Particle Size; D012211:Rhenium / Q000737:chemistry*; D013059:Spectrum Analysis, Raman / Q000379:methods*; D013499:Surface Properties; D013696:Temperature; D013816:Thermodynamics
chemical_list: D000814:Aniline Compounds; D001894:Borohydrides; D009596:Nitrophenols; C015428:perrhenate; C019498:4-nitroaniline; D012211:Rhenium; D004247:DNA; D008751:Methylene Blue; C024836:4-nitrophenol
keywords: Catalysis; DNA; Nanoparticles; Rhenium; SERS