Atomic resolved material displacement on graphite surfaces by scanning tunnelling microscopy

摘要: Atomic scale modifications and subsequent atomic resolution imaging has been achieved on the highly oriented pyrolytic graphite surface in air. Application of short pulse voltages, above a minimum threshold voltage 3.5 V, across tunneling gap results displacement layer or more atoms to form hole create neighboring mound ‘‘nanodot’’ from displaced atoms. We have found correlation between volume at level observe an asymmetric material all cases feature creation. Nanofeatures as small four carbon beta sites created. Our experimental observations are consistent with modification process depending gradient electric field induced by rise time bias not duration. Interesting faceting behavior also observed around some edges. Tip pulsing sometimes tip, modification, resulting change image.