K. Sampathkumar

K. Sampathkumar

Master of Science

About

8
Publications
1,823
Reads
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84
Citations
Citations since 2017
8 Research Items
84 Citations
20172018201920202021202220230510152025
20172018201920202021202220230510152025
20172018201920202021202220230510152025
20172018201920202021202220230510152025
Additional affiliations
December 2016 - January 2017
Bharathiar University
Position
  • Internship
Description
  • Very few layer RGO via modified Hummer method. Transferring very few layer RGO of high lateral size. Manual electrical contact and its sensing application done.
December 2015 - present
J.Heyrovsky Institute of physicalchemistry
Position
  • Research Assistant
Description
  • 2D materials (clean room operation, etc – RF sputtering, plasma cleaning, basics of UV lithography), independent execution of characterization techniques (Raman and PL spectroscopy, AFM, semiconductor, UV-Vis-NIR spectroscopy). Data analysis.
May 2015 - June 2015
Bharathiar University
Position
  • Internship
Description
  • ZnO nanorod (NR) under VPT process in the tubular furnace. Making manual electrical contacts on single ZnO NR with and without PEDOT as a junction layer and studying their electrical response (-RF & DC sputtering, PL, FESEM, and contact angle measurement)
Education
July 2014 - April 2016
Bharathiar University
Field of study
  • Nano Science and Technology
June 2010 - November 2013
Kongunadu Arts and Science College, Bharathiar University
Field of study
  • Physics

Publications

Publications (8)
Article
Full-text available
Recent advancements in isolation and stacking of layered van der Waals materials have created an unprecedented paradigm for demonstrating varieties of 2D quantum materials. Rationally designed van der Waals heterostructures composed of monolayer transition‐metal dichalcogenides (TMDs) and few‐layer hBN show several unique optoelectronic features dr...
Article
Full-text available
Suspended membranes of two-dimensional (2D) materials are of interest for many applications. Much of their characterization relies on scanning probe microscopy (SPM) techniques such as atomic force microscopy (AFM) or scanning tunneling microscopy (STM). Unlike rigid samples, the suspended atomically thin 2D membranes are, however, flexible and do...
Article
Wrinklons, the transition zone where two wrinkles are merged to one, have been observed in various thin films across all scales. For suspended films the evolution of the wrinklon wavelength from the edge can be described by λ∼xm, where m is universal. Herein we show experimentally that for graphene wrinklons on a compliant polymer, m is not univers...
Article
Raman spectroscopy is undoubtedly the most frequently used technique for universal characterization of graphene and related materials. Quantification of parameters like disorder or strain is possible through analysis of particular Raman bands. However, under certain conditions, such evaluation can be jeopardized by – sometimes hidden – convolution...
Article
The rise of nanomaterials requires a day‐to‐day implementation of suitable nanoscale characterization techniques. Atomic force microscopy (AFM) has become such a one, capable of providing diverse information about the sample topography, mechanical and electrical properties with resolution down to few nanometers. The work by Otakar Frank and co‐work...
Article
Full-text available
Multilayered graphitic materials are not suitable as load-bearers due to their inherent weak interlayer bonding (for example, graphite is a solid lubricant in certain applications). This situation is largely improved when two-dimensional (2-D) materials such as a monolayer (SLG) graphene are employed. The downside in these cases is the presence of...

Questions

Questions (7)
Question
Sometimes researchers getting new results out from the similar experiments done by other researchers. But, if they propose some new phenomena against the existing one, the scientific community is not easily accepting. So far I observed, people, trusting, following and try to prove the scientific phenomena (physics) proposed by well-known persons in scientific society. If those results not accepted by any high impact journal community, still, it get accepted by a low impact journal community which infer proposed phenomena were not studied properly.
Would you mind to tell what is real science then? What's exact factor decides the quality of scientific phenomena?
Question
Greetings,
TMDC mono layer has been connected with one of the electrode and the bulk part which is attached with mono layer was connected with the counter electrode. What could be the electrical transport consequences ? Since, mono layer have different transport characteristics and bulk having different transport characteristics.
This Question is related with my last question have been asked a few days ago.
It would be appreciated if you answer this !
Thank you
Question
Greetings,
TMDC mono-layer hetero junction I made by transferring of each flake (mono-layer attached with bulk portion) on gold contact fingers(bottom electrode contacts made on 300nm SiO2 substrate). Notable things is , stacked mono-layers form hetero junction. The bulk portions attached with mono-layers contacted on gold electrodes. This hetero junction is photosensitive (p - n photo diode ). The measured IV(photo IV) and transport characteristics showing unique results than all published works. Results showing, the formed hetero junction could lead to feasibility of the self biasing device(IR detector) as well. Which is unique than i ever read from published articles for my material. Thus, I got question, if the mono-layer connected with bulk together could show any different results , even though the hetero made with mono-layer portion only ?
I couldn't find any right paper which has been argued about these. Please, help me to resolve this question ?
Of-course the screening effect becomes stronger on bulk portion compare to mono-layer. I would need the scientific data which can resolve my question rather than technical one. I would be glad to get your valuable answers or comments
Question
How PL of 2D materials gets changes between normal electrons and hot electrons. Does, hot electrons will induce the any special feature on PL spectrum of 2D layers like MoS2 and WS2 ?
Question
I would like to establish growing of 1D nano wires on 2D TMDC materials (integrated system, 1D and 2D) at low-temperature chemical bath synthesis. The cruciality is nucleation of 1D structure on 2D TMDC without any seed layer (except 2D TMDC as its own). As I tried I couldn't be achieved it as what I expected. Since, I tried to grow ZnO nano rod (normal liquid phase synthesis) on TMDC layers MoS2, WS2 and MoSe2. But, results shown some spots on layer surface, assisted for ZnO NR growth which is countable spots only. I read some papers on which people said MoS2 layer favorable for 001 plane growth (001 plane favour for ZnO NR also). But, they grown vertical MoS2 on 2D MOS2 layer...     I couldn't find the right paper. So, I need your valuable suggestions, assistance and comments
Question
Dear seniors , i have question related to conductive polymer , "poly(9 9-di-n-octylfluorenyl-2 7-diyl)".I dissolved 5mg of poly(9 9-di-n-octylfluorenyl-2 7-diyl) in 10 ml chloroform.. Then i dropped some drop of this dissolved polymer on glass slide.. and tried to checked its resistance with multi meter (Range 0-20M ohms). But, its not gave me any result.. Do, i need to initiate the polymerization after spun this solution on glass for conduction? Or, is there any fault i did on process? I can't found proper paper for this polymer process. I attached one article in which i found different result.. please, check it out and answer me as soon as possible to continue my work :). Thanks in advance with new year wishes, 2017
Question
I was exfoliated graphene on ITO substrate..  During taken my Raman spectra its showing weird to me... I mostly got the G peak was more intense than the 2D even for the mono layer. Instead of getting a sharp 2D peak , I got less intense 2D peak than G one. And shape of the 2D peak is not showing me as i read from the literature's.. Whether i measured on right mono layer or is it any charging (or)  doping ??

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Projects

Projects (2)
Project
Due to the novelty, layered dependent physical and chemical properties of two dimensional(2D) layered materials got attention among the scientific community. However, tuning their properties by the external perturbation has importance in recent days. This project will be focused on addressing the possibilities, issues related to the manipulation of the properties of 2Dlayered materials by using Strain Engineering and Surface Acoustic Wave(SAW) phonon. Also towards real-time application possibilities.
Archived project
The goal of the project is to study and - in an ideal case - to create energy funnels in two dimensional transition metal dichalcogenides. The spatially continuous band gap change will be induced by mechanical deformation via various methods. The project is funded by the Neuron fund for support of science.