Full data acquisition in Kelvin Probe Force Microscopy: Mapping dynamic electric phenomena in real space
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Kelvin probe force microscopy (KPFM) has provided deep insights into the role local electronic, ionic and electrochemical processes play on the global functionality of materials and devices, even down to the atomic scale. Conventional KPFM utilizes heterodyne detection and bias feedback to measure the contact potential difference (CPD) between tip and sample. This measurement paradigm, however, permits only partial recovery of the information encoded in bias- and time-dependent electrostatic interactions between the tip and sample and effectively down-samples the cantilever response to a single measurement of CPD per pixel. This level of detail is insufficient for electroactive materials, devices, or solid-liquid interfaces, where non-linear dielectrics are present or spurious electrostatic events are possible. Here, we simulate and experimentally validate a novel approach for spatially resolved KPFM capable of a full information transfer of the dynamic electric processes occurring between tip and sample. General acquisition mode, or G-Mode, adopts a big data approach utilising high speed detection, compression, and storage of the raw cantilever deflection signal in its entirety at high sampling rates (> 4 MHz), providing a permanent record of the tip trajectory. We develop a range of methodologies for analysing the resultant large multidimensional datasets involving classical, physics-based and information-based approaches. Physics-based analysis of G-Mode KPFM data recovers the parabolic bias dependence of the electrostatic force for each cycle of the excitation voltage, leading to a multidimensional dataset containing spatial and temporal dependence of the CPD and capacitance channels. We use multivariate statistical methods to reduce data volume and separate the complex multidimensional data sets into statistically significant components that can then be mapped onto separate physical mechanisms. Overall, G-Mode KPFM offers a new paradigm to study dynamic electric phenomena in electroactive interfaces as well as offer a promising approach to extend KPFM to solid-liquid interfaces.
- Research Organization:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS)
- Sponsoring Organization:
- USDOE Office of Science (SC)
- Grant/Contract Number:
- AC05-00OR22725
- OSTI ID:
- 1295108
- Journal Information:
- Scientific Reports, Journal Name: Scientific Reports Vol. 6; ISSN 2045-2322
- Publisher:
- Nature Publishing GroupCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Similar Records
Band excitation Kelvin probe force microscopy utilizing photothermal excitation
Band Excitation Kelvin probe force microscopy utilizing photothermal excitation
Kelvin Probe Force Microscopy in liquid using Electrochemical Force Microscopy
Journal Article
·
Mon Mar 09 00:00:00 EDT 2015
· Applied Physics Letters
·
OSTI ID:22395737
Band Excitation Kelvin probe force microscopy utilizing photothermal excitation
Journal Article
·
Thu Mar 12 20:00:00 EDT 2015
· Applied Physics Letters
·
OSTI ID:1265398
Kelvin Probe Force Microscopy in liquid using Electrochemical Force Microscopy
Journal Article
·
Sun Jan 18 19:00:00 EST 2015
· Beilstein Journal of Nanotechnology
·
OSTI ID:1185854