Study explains unexpected conductivity of nanoscale silicon

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With her face reflected in a small glass port physics graduate student Pengpeng Zhang peers into a scanning tunneling microscope that uses electrical current to measure atomic-sized features on the surface of nanoscale silicon membranes. Zhang is a r ...
With her face reflected in a small glass port, physics graduate student Pengpeng Zhang peers into a scanning tunneling microscope that uses electrical current to measure atomic-sized features on the surface of nanoscale silicon membranes. Zhang is a research assistant working in the lab of materials science and engineering professor Max Lagally. She is part of the team that demonstrated how nanoscale silicone surfaces can conduct electricity — a surprising finding that will have implications for nanotechnology development. Photo by: Jeff Miller

When graduate student Pengpeng Zhang successfully imaged a piece of silicon just 10 nanometers-or a millionth of a centimeter-in thickness, she and her University of Wisconsin-Madison co-researchers were puzzled. According to established thinking, the feat should be impossible because her microscopy method required samples that conduct electricity.


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