title: Dextrin-mediated synthesis of Ag NPs for colorimetric assays of Cu(2+) ion and Au NPs for catalytic activity.
abstract: A facile one-pot approach for rapid synthesis of silver and gold nanoparticles (Ag NPs and Au NPs) with narrow size distribution and good stability was described by reducing silver nitrate and chloroauric acid with polysaccharide dextrin. Here, dextrin was used as both a reducing and stabilizing agent for synthesis of NPs. The as-synthesized Ag NPs and Au NPs were characterized by UV-visible absorption spectroscopy, transmission electron microscopy (TEM) and X-ray diffraction (XRD). The Ag NPs and Au NPs exhibited an absorption maxima at 404 and 547 nm respectively. TEM images showed NPs in the range of 8-28 nm. The crystallinity of the NPs was measured by XRD analysis. Furthermore, the as-prepared Ag NPs revealed colorimetric sensor property for detection of Cu(2+) ions based on changes in absorbance resulting from metal ion-induced aggregation of NPs or direct deposition of metal ions onto NPs. The as-prepared Au NPs exhibited a notable catalytic activity toward the reduction of 4-nitrophenol to 4-aminophenol in the presence of NaBH4.
authors.affiliation: Department of Polymer Science and Technology, University College of Science and Technology, University of Calcutta, 92 A.P.C. Road, Kolkata 700 009, India; Department of Chemistry, Tamralipta Mahavidyalaya, Tamluk, Purba Medinipur 721636, India.
authors.forename: Kalipada
authors.initials: K
authors.lastname: Bankura
authors.affiliation: Department of Chemical and Biological Engineering, Industrial Membrane Research Institute, University of Ottawa, 161 Louis Pasteur St., Ottawa, ON K1N 6N5, Canada.
authors.forename: Dipak
authors.initials: D
authors.lastname: Rana
authors.affiliation: Department of Polymer Science and Technology, University College of Science and Technology, University of Calcutta, 92 A.P.C. Road, Kolkata 700 009, India.
authors.forename: Md Masud Rahaman
authors.initials: MM
authors.lastname: Mollick
authors.affiliation: Department of Chemistry, West Bengal State University, Barasat, Kolkata 700126, India.
authors.forename: Sutanuka
authors.initials: S
authors.lastname: Pattanayak
authors.affiliation: Department of Polymer Science and Technology, University College of Science and Technology, University of Calcutta, 92 A.P.C. Road, Kolkata 700 009, India.
authors.forename: Biplab
authors.initials: B
authors.lastname: Bhowmick
authors.affiliation: Department of Polymer Science and Technology, University College of Science and Technology, University of Calcutta, 92 A.P.C. Road, Kolkata 700 009, India.
authors.forename: Nayan Ranjan
authors.initials: NR
authors.lastname: Saha
authors.affiliation: Department of Polymer Science and Technology, University College of Science and Technology, University of Calcutta, 92 A.P.C. Road, Kolkata 700 009, India.
authors.forename: Indranil
authors.initials: I
authors.lastname: Roy
authors.affiliation: Department of Polymer Science and Technology, University College of Science and Technology, University of Calcutta, 92 A.P.C. Road, Kolkata 700 009, India.
authors.forename: Tarapada
authors.initials: T
authors.lastname: Midya
authors.affiliation: Department of Chemistry, Midnapore College, Midnapore 721101, India.
authors.forename: Gadadhar
authors.initials: G
authors.lastname: Barman
authors.affiliation: Department of Polymer Science and Technology, University College of Science and Technology, University of Calcutta, 92 A.P.C. Road, Kolkata 700 009, India. Electronic address: dipankar.chattopadhyay@gmail.com.
authors.forename: Dipankar
authors.initials: D
authors.lastname: Chattopadhyay
mesh_terms: D002384:Catalysis; D060326:Chemistry Techniques, Synthetic; D002712:Chlorides / Q000737:chemistry; D003124:Colorimetry; D003300:Copper / Q000032:analysis* / Q000737:chemistry; D003912:Dextrins / Q000737:chemistry*; D006046:Gold / Q000737:chemistry; D017612:Gold Compounds / Q000737:chemistry; D053768:Metal Nanoparticles / Q000737:chemistry*; D036103:Nanotechnology; D010316:Particle Size; D019163:Reducing Agents / Q000737:chemistry*; D012834:Silver / Q000737:chemistry*; D012835:Silver Nitrate / Q000737:chemistry
chemical_list: D002712:Chlorides; D003912:Dextrins; D017612:Gold Compounds; D019163:Reducing Agents; D012834:Silver; D006046:Gold; D003300:Copper; C024568:gold tetrachloride, acid; D012835:Silver Nitrate
keywords: Catalytic activity; Colorimetric sensor; Dextrin