Photothermal modulation for oscillating mode atomic force microscopy in solution

被引:106
作者
Ratcliff, GC
Erie, DA
Superfine, R
机构
[1] Univ N Carolina, Dept Chem, Chapel Hill, NC 27599 USA
[2] Univ N Carolina, Dept Phys & Astron, Chapel Hill, NC 27599 USA
关键词
D O I
10.1063/1.121224
中图分类号
O59 [应用物理学];
学科分类号
摘要
Solution imaging using resonant techniques for atomic force microscopy is greatly simplified by driving the cantilever directly. We have taken advantage of the temperature-sensitive bending properties of metal-coated silicon nitride cantilevers to induce vibrations in the lever using a modulated laser. We demonstrate that photothermal modulation with a nominal 2 mW laser in solution produces a single resonance, typically, of 8-20 nm amplitude, that can be used for imaging. We present high-quality images of DNA on a mica surface to show the capabilities of this technique for solution imaging. (C) 1998 American Institute of Physics.
引用
收藏
页码:1911 / 1913
页数:3
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