Etched depth as a function of pressing force. (a) and (b) were obtained on n-type and p-type Ge(100) surfaces, respectively. Blue and gray filled circles represent data with Pt-coated cantilevers in saturated dissolved-oxygen water (SOW) and low-dissolved-oxygen (LOW) water, respectively. Light gray filled circles were obtained with a Si cantilever in SOW.
Kawase et al. Nanoscale Research Letters 2013 8:151 doi:10.1186/1556-276X-8-151