title: Nanoscale potential measurements in liquid by frequency modulation atomic force microscopy.
abstract: We have developed a method for local potential measurements in liquid using frequency modulation atomic force microscopy. In this method, local potential is calculated from the first and second harmonic vibrations of a cantilever induced by applying an ac bias voltage between a tip and a sample. The use of an ac bias voltage with a relatively high frequency prevents uncontrolled electrochemical reactions and redistribution of ions and water. The nanoscale resolution of the method is demonstrated by imaging potential distribution of a dodecylamine thin film deposited on a graphite surface in 1 mM NaCl solution.
authors.affiliation: Frontier Science Organization, Kanazawa University, Kakuma-machi, Kanazawa 920-1192, Japan.
authors.forename: Naritaka
authors.initials: N
authors.lastname: Kobayashi
authors.forename: Hitoshi
authors.initials: H
authors.lastname: Asakawa
authors.forename: Takeshi
authors.initials: T
authors.lastname: Fukuma
mesh_terms: D000588:Amines / Q000737:chemistry; D018625:Microscopy, Atomic Force / Q000295:instrumentation*; D036103:Nanotechnology / Q000295:instrumentation*; D015203:Reproducibility of Results; D012965:Sodium Chloride / Q000737:chemistry; D013499:Surface Properties
chemical_list: D000588:Amines; D012965:Sodium Chloride; C003935:dodecylamine