Synthesis and Characterization of Gold Nanostars as Filler of Tunneling Conductive Polymer Composites

Highly multibranched gold nanostars were obtained by a room-temperature synthesis assisted by deep-eutectic solvents (DES). The concentration of the ascorbate ions and the presence of water in the solution were found to both have a profound influence on branch formation. A growth mechanism of the nanostar is therefore proposed from the analysis of the particle dimensions, the aspect ratio of their protuberances, and the gold crystal size. These spiky nanoparticles would find an application as conductive filler in polymeric piezoresistive composites, based on a tunneling conduction mechanism.

[1]  A. Agarwal,et al.  Gold nanorods 3D-supercrystals as surface enhanced Raman scattering spectroscopy substrates for the rapid detection of scrambled prions , 2011, Proceedings of the National Academy of Sciences.

[2]  David Bloor,et al.  A metal–polymer composite with unusual properties , 2005 .

[3]  Steven R. Emory,et al.  Probing Single Molecules and Single Nanoparticles by Surface-Enhanced Raman Scattering , 1997, Science.

[4]  Cheng Luo,et al.  Reinforcement of PDMS masters using SU-8 truss structures , 2005 .

[5]  U. Valdrè,et al.  Microscopy and computational modelling to elucidate the enhancement factor for field electron emitters , 2001 .

[6]  I. Balberg,et al.  Tunneling and percolation in metal-insulator composite materials , 2003, cond-mat/0306059.

[7]  E. Esenturk,et al.  Surface-enhanced Raman scattering spectroscopy via gold nanostars , 2009 .

[8]  Giovanni Ausanio,et al.  Giant resistivity change induced by strain in a composite of conducting particles in an elastomer matrix , 2006 .

[9]  Tuan Vo-Dinh,et al.  Gold Nanostars For Surface-Enhanced Raman Scattering: Synthesis, Characterization and Optimization. , 2008, The journal of physical chemistry. C, Nanomaterials and interfaces.

[10]  Michael H. Huang,et al.  Synthesis of branched gold nanocrystals by a seeding growth approach. , 2005, Langmuir : the ACS journal of surfaces and colloids.

[11]  L. Liz‐Marzán,et al.  High-yield synthesis and optical response of gold nanostars , 2008, Nanotechnology.

[12]  Andrés Díaz Lantada,et al.  Quantum tunnelling composites: Characterisation and modelling to promote their applications as sensors , 2010 .

[13]  Q. Zheng,et al.  Time dependence of piezoresistance for the conductor-filled polymer composites , 2000 .

[14]  M. José-Yacamán,et al.  Beyond Archimedean solids: Star polyhedral gold nanocrystals , 2005 .

[15]  N. Halas,et al.  Mesoscopic Au “Meatball” Particles , 2008 .

[16]  Guanzhong Wang,et al.  Nanospheres of silver nanoparticles: agglomeration, surface morphology control and application as SERS substrates. , 2009, Physical chemistry chemical physics : PCCP.

[17]  S. Evans,et al.  Near‐Bulk Conductivity of Gold Nanowires as Nanoscale Interconnects and the Role of Atomically Smooth Interface , 2010, Advanced materials.

[18]  Changquan Calvin Sun,et al.  Characterization of thermal behavior of deep eutectic solvents and their potential as drug solubilization vehicles. , 2009, International journal of pharmaceutics.

[19]  Bertil Sundqvist,et al.  Resistivity of a composite conducting polymer as a function of temperature, pressure, and environment: Applications as a pressure and gas concentration transducer , 1986 .