D
Debdulal Roy
Researcher at National Physical Laboratory
Publications - 54
Citations - 4045
Debdulal Roy is an academic researcher from National Physical Laboratory. The author has contributed to research in topics: Raman spectroscopy & Carbon nanotube. The author has an hindex of 28, co-authored 53 publications receiving 3607 citations. Previous affiliations of Debdulal Roy include King's College London & University of Cambridge.
Papers
More filters
Journal ArticleDOI
Growth process conditions of vertically aligned carbon nanotubes using plasma enhanced chemical vapor deposition
Manishkumar Chhowalla,Kenneth B. K. Teo,Caterina Ducati,Nalin L. Rupesinghe,Gehan A. J. Amaratunga,Andrea C. Ferrari,Debdulal Roy,John Robertson,William I. Milne +8 more
TL;DR: In this paper, the growth of vertically aligned carbon nanotubes using a direct current plasma enhanced chemical vapor deposition system was reported, and the growth properties were studied as a function of the Ni catalyst layer thickness, bias voltage, deposition temperature, C2H2:NH3 ratio, and pressure.
Journal ArticleDOI
Effect of disorder on Raman scattering of single-layer Mo S 2
Sandro Mignuzzi,Sandro Mignuzzi,Andrew J. Pollard,Nicola Bonini,Barry Brennan,Ian S. Gilmore,Marcos A. Pimenta,David Richards,Debdulal Roy +8 more
TL;DR: In this paper, the effect of defects induced by ion bombardment on the Raman spectrum of single-layer molybdenum disulfide was determined by using density functional theory to calculate the phonon dispersion curves.
Journal ArticleDOI
Characterisation of carbon nano-onions using Raman spectroscopy
Debdulal Roy,Manishkumar Chhowalla,Haolan Wang,Noriaki Sano,Ioannis Alexandrou,T.W. Clyne,Gehan A. J. Amaratunga +6 more
TL;DR: In this article, the position of the G peak and the appearance of transverse optic phonon peaks of carbon onions have been identified in terms of the Raman spectrum from carbon onions, and the curvature of the graphene planes is invoked to explain the relaxation of Raman selection rules and appearance of the new peaks.
Journal ArticleDOI
Multifunctional nanoprobes for nanoscale chemical imaging and localized chemical delivery at surfaces and interfaces.
Yasufumi Takahashi,Andrew Shevchuk,Pavel Novák,Yanjun Zhang,Neil Ebejer,Julie V. Macpherson,Patrick R. Unwin,Andrew J. Pollard,Debdulal Roy,Charles A. Clifford,Hitoshi Shiku,Tomokazu Matsue,David Klenerman,Yuri E. Korchev +13 more
TL;DR: Double-barrel carbon nanoprobes with integrated distance control for simultaneous nanoscale electrochemical and ion conductance microscopy can be fabricated with a wide range of probe sizes in less than two minutes.
Journal ArticleDOI
Intervalley scattering by acoustic phonons in two-dimensional MoS2 revealed by double-resonance Raman spectroscopy.
Bruno R. Carvalho,Yuanxi Wang,Sandro Mignuzzi,Debdulal Roy,Debdulal Roy,Mauricio Terrones,Cristiano Fantini,Vincent H. Crespi,Leandro M. Malard,Marcos A. Pimenta +9 more
TL;DR: A multiple energy excitation Raman study in conjunction with density functional theory calculations that unveil the double-resonance Raman scattering process in monolayer and bulk MoS2 and highlights the underlying physics of intervalley scattering of electrons by acoustic phonons, which is essential for valley depolarization in MoS 2.