Chemistry Department Seminar

"Some Aspects of Nanoelectrochemistry of Gold Nanoparticles and Their Derivatives"

Presented by Erkang Wang, Changchun Inst of Applied Chemistry, Chinese Academy of Sciences, China

Friday, March 4, 2005, 10:00 am — Room 300, Chemsitry Bldg. 555

1. Proposing a dual energy barrier tunneling model to explain the imageability of the gold nanoparticles by STM. This model can also be used to construct multiple energy barrier structure on solid/liquid interface and to evaluate the electron transport ability of some monolayers of so-called “molecular wires” with electrochemical method. Thus we create the gold/molecular wire/gold sandwich like structures on gold electrode surface through molecular self-assembly and nanogold fabrication techniques.

2. Utilizing ITO-supported gold nanoparticle arrays as nanoelectrode arrays. Some conventional molecular self-assembly systems, such as monolayers of iodine, porphyrin monolayers and heteropoly acid, phospholipid/alkanethiol bilayers, 3-mercaptopropionicacid-bridged copper hexacyanoferrate multilayers, etc. can safely be transferred onto ITO-supported gold nanoparticle surfaces.

3. Gold nanoparticles can tune reactivities of electroactive species in solution and surface-bound proteins, which indicates that gold nanoparticles help heterogeneous electron tranfer.

4. ITO-bound gold nanoparticles can catalyze electroless deposition of gold to generate SPR-active electrode interface, which is used to investigate Ag UPD in-situ. 5. Utilizing gold nanoparticles as structural and functional units to deposit HRP on gold electrode surface, the resulted HRP/gold-nanoparticle electrode is a novel H2O2 biosensor with high stability.

Acknowledgement: This work was supported by the National Natural Sciences Foundation of China

Hosted by: Alexander Harris

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