title: Ferric ion-assisted in situ synthesis of silver nanoplates on polydopamine-coated silk.
abstract: In the present study, a ferric ion (Fe(3+))-assisted in situ synthesis approach was developed to grow silver (Ag) nanoplates on the polydopamine (PDA)-coated silk without the use of additional reductants. The essential role of Fe(3+) in the formation of Ag nanoplates is revealed by comparing the morphologies of Ag nanostructures prepared on the silk-coated PDA film with/without Fe(3+) doping. Scanning electron micrographs show that high-density Ag nanoplates could be synthesized in the reaction system containing 50μg/mL FeCl3 and 50mM AgNO3. The size of the Ag nanoplate could be tuned by adjusting the reaction duration. Based on the data, a mechanism involving the Fe(3+)-selected growth of Ag atoms along the certain crystal faces was proposed to explain the fabrication process. Transmission electron microscopy and X-ray diffractometry indicate that the Ag nanoplates possess good crystalline structures. Raman spectra demonstrate that the nanoplates could strongly enhance the Raman scattering of the PDA molecules. The Ag nanoplate-coated silk could be utilized as a flexible substrate for the development of surface-enhanced Raman scattering biosensors.
authors.affiliation: Chongqing Key Laboratory for Advanced Materials & Technologies of Clean Energies, Southwest University, 1 Tiansheng Road, Chongqing 400715, PR China; Institute for Clean Energy & Advanced Materials, Southwest University, 1 Tiansheng Road, Chongqing 400715, PR China.
authors.forename: Jing
authors.initials: J
authors.lastname: Xiao
authors.affiliation: Chongqing Key Laboratory for Advanced Materials & Technologies of Clean Energies, Southwest University, 1 Tiansheng Road, Chongqing 400715, PR China; Institute for Clean Energy & Advanced Materials, Southwest University, 1 Tiansheng Road, Chongqing 400715, PR China.
authors.forename: Huihui
authors.initials: H
authors.lastname: Zhang
authors.affiliation: Chongqing Key Laboratory for Advanced Materials & Technologies of Clean Energies, Southwest University, 1 Tiansheng Road, Chongqing 400715, PR China; Institute for Clean Energy & Advanced Materials, Southwest University, 1 Tiansheng Road, Chongqing 400715, PR China.
authors.forename: Cuiping
authors.initials: C
authors.lastname: Mao
authors.affiliation: Chongqing Key Laboratory for Advanced Materials & Technologies of Clean Energies, Southwest University, 1 Tiansheng Road, Chongqing 400715, PR China; Institute for Clean Energy & Advanced Materials, Southwest University, 1 Tiansheng Road, Chongqing 400715, PR China.
authors.forename: Ying
authors.initials: Y
authors.lastname: Wang
authors.affiliation: Chongqing Key Laboratory for Advanced Materials & Technologies of Clean Energies, Southwest University, 1 Tiansheng Road, Chongqing 400715, PR China; Institute for Clean Energy & Advanced Materials, Southwest University, 1 Tiansheng Road, Chongqing 400715, PR China.
authors.forename: Ling
authors.initials: L
authors.lastname: Wang
authors.affiliation: Chongqing Key Laboratory for Advanced Materials & Technologies of Clean Energies, Southwest University, 1 Tiansheng Road, Chongqing 400715, PR China; Institute for Clean Energy & Advanced Materials, Southwest University, 1 Tiansheng Road, Chongqing 400715, PR China. Electronic address: zslu@swu.edu.cn.
authors.forename: Zhisong
authors.initials: Z
authors.lastname: Lu
mesh_terms: D005290:Ferric Compounds / Q000737:chemistry*; D007211:Indoles / Q000737:chemistry*; D007477:Ions / Q000737:chemistry; D053768:Metal Nanoparticles / Q000737:chemistry*; D010316:Particle Size; D011108:Polymers / Q000737:chemistry*; D047011:Silk / Q000737:chemistry*; D012834:Silver / Q000737:chemistry*; D013499:Surface Properties
chemical_list: D005290:Ferric Compounds; D007211:Indoles; D007477:Ions; D011108:Polymers; D047011:Silk; C568283:polydopamine; D012834:Silver
keywords: Ferric ions; Polydopamine; Silk; Silver nanoplates; Surface-enhanced Raman scattering