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Graphene layer number characterization using scanning kelvin probe force microscopy

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Title Statement Graphene layer number characterization using scanning kelvin probe force microscopy
 
Added Entry - Uncontrolled Name Toutam, Vijay Kumar; Advanced Carbon Products and Metrology Section, Advanced Materials and Devices Metrology Division, CSIR-National Physical Laboratory, New Delhi 110 060, India
 
Uncontrolled Index Term Metrology, NMI, NPL, BIS, VAMAS, Graphene, AFM, KPFM
 
Summary, etc. As the importance of material surfaces and interfaces for industrial applications is ever increasing, a need for accuratemeasurement of their properties and functionalities with traceability and reproducibility through unbroken chain ofmeasurements and their reference materials for proficiency testing has become very important. Carbon and its allotropeshave several industrial applications and recently graphene which is a two dimensional layered material of carbon has provento have great potential, and its characterization for layer number has become very important. A need for quantitativemeasurement apart from existing qualitative techniques is very much required for accurate determination of layer number.Under the aegis of Versailles Project on Advanced Materials and Standards (VAMAS), technical working area (TWA-2) aninternational round robin test is conducted among 13 laboratories for establishing a protocol for accurate measurement ofgraphene layer number and generating reference material. CSIR-NPL being NMI of India participated and contributed to theproject which got recognition from VAMAS for its participation. Scanning Kelvin Probe Force Microscopy (SKPFM) ofgraphene layers on Au/SiO2/Si and SiO2/Si substrates is performed and their CPD data is compared. Graphene onAu/SiO2/Si has shown consistent CPD data for different modulation voltages with least uncertainty. From the comparativeanalysis it is found that SKPFM has potential to be an international standard technique to determine graphene layer numberand can generate certified reference material.
 
Publication, Distribution, Etc. Indian Journal of Engineering and Materials Sciences (IJEMS)
2021-03-24 10:24:59
 
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http://op.niscair.res.in/index.php/IJEMS/article/view/47561
 
Data Source Entry Indian Journal of Engineering and Materials Sciences (IJEMS); ##issue.vol## 27, ##issue.no## 6 (2020): IJEMS- DECEMBER 2020
 
Language Note en
 
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