STM Studies of Gold Clusters in nanometer-sized graphite pits

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STM Studies of Gold Clusters in nanometer-sized
graphite pits

• Ulai Noomnarm
• University of Florida

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Nanometer-sized Pit Applications

• templates for microelectronic devices
• immobilization for STM imaging

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Scanning Tunneling Microscopy

• Based on quantum mechanical tunneling between
  classically forbidden areas

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Pit Formation

• Oxidation circular monolayer pits
• diameter dependent on time, temperature, O2
  partial pressure

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Experiment

• Prepare gold source
• Dose with Ar ions and heat
• Deposit gold into pits
• Examine with STM

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Gold Source Preparation

• 1 Develop test chamber
• 2 Check purity with Auger Electron Spectroscopy
  (AES)
• 3 Determine thickness with Rutherford
  Backscattering (RBS)

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Auger Electron Spectroscopy
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Rutherford Backscattering
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Auger Results
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RBS results
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Conclusions

• Prepared and calibrated a clean gold source
• Tested and calibrated ion gun
• Prepared furnace for heating