Side charge propagation in simultaneous KPFM and transport measurement of humidity exposed graphene FET sensor
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26620%2F23%3APU150165" target="_blank" >RIV/00216305:26620/23:PU150165 - isvavai.cz</a>
Alternative codes found
RIV/70883521:28110/23:63569641
Result on the web
<a href="https://doi.org/10.1016/j.carbon.2023.118471" target="_blank" >https://doi.org/10.1016/j.carbon.2023.118471</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.carbon.2023.118471" target="_blank" >10.1016/j.carbon.2023.118471</a>
Alternative languages
Result language
angličtina
Original language name
Side charge propagation in simultaneous KPFM and transport measurement of humidity exposed graphene FET sensor
Original language description
The surface diffusion (dissipation) of charge carriers enhanced by water molecules in solution-based biosensors and ambient operating gas sensors strongly influence their resistance response, sensitivity, and stability in time. Therefore, the information on the charge distribution at interfaces of conductive and insulating parts is essential for the operating sensors. This work presents the simultaneous measurement of the longitudinal macroscopic resistance response and local surface potential (SP) mapping by Kelvin probe force microscopy (KPFM) on a graphene Hall bar sensor. The results show the propagation of an electric charge from the main graphene channel onto the neighboring SiO2 surface. The charge propagation strongly increases with the relative humidity and can be controlled by a bottom-gate voltage used in most sensors based on a field effect transistor (FET) architecture. As proved by the longitudinal resistance measurements, the resulting side charge accumulation has a very small impact on the 2D resistivity of the graphene channel. It has been explained by an application of the Thomas Fermi theory, proving an efficient screening of side accumulated charge potential caused by a redistribution of the charge inside the wide graphene channel. The combination of a transport resistance response and KPFM provides a deeper understanding of sensors/biosensors functionality and their design features than a simple resistance response usually observed.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10400 - Chemical sciences
Result continuities
Project
Result was created during the realization of more than one project. More information in the Projects tab.
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Others
Publication year
2023
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
CARBON
ISSN
0008-6223
e-ISSN
1873-3891
Volume of the periodical
215
Issue of the periodical within the volume
1
Country of publishing house
US - UNITED STATES
Number of pages
12
Pages from-to
„118471“-„“
UT code for WoS article
001087284600001
EID of the result in the Scopus database
2-s2.0-85173172187