Growth of few- and multilayer graphene on different substrates using pulsed nanosecond Q-switched Nd:YAG laser

Kumar, Pramod; Kanaujia, Pawan K.; Prakash, G. Vijaya; Dewasi, Avijit; Lahiri, Indranil; Mitra, Anirban

doi:10.1007/s10853-017-1327-8

Cited by 13 publications

(6 citation statements)

References 42 publications

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“…These two peaks are often referred to as the G and D-bands, respectively, and the ratio of these two bands is an indicator of the level of functionalization. The I D / I G ratio for our GO was 0.80, which indicates a relatively high level of oxidation and generation of sp 3 atoms via the attachment of oxygen-containing functional groups. − GO also has a broad peak at 2500–3200 cm –1 , which is referred to as the 2D band. The I 2D / I G ratio can be used to estimate the number of GO layers .…”

Section: Resultsmentioning

confidence: 82%

Synthesis of Oligomeric and Monomeric Functionalized Graphene Oxides and a Comparison of Their Abilities to Perform as Protein Ligands and Enzyme Inhibitors

Aziz

Twyman

2019

ACS Appl. Mater. Interfaces

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Graphene oxide (GO) is a versatile, monomolecular layered nanomaterial that possesses various oxygen-containing functionality on its large surface. These characteristics allow GO to interact with a variety of materials and to be applied towards a number of areas. The strength and selectivity of these interactions can be improved significantly through further functionalization. In this paper, we describe the functionalization of GO and its application as a protein ligand and an enzyme inhibitor. The work reported in this paper details how chymotrypsin inhibition can be improved using GO functionalized with a monomeric and oligomer layer of tyrosine. The results indicated that the mono- and oligo-functionalized systems performed extremely well, with K i values nearly four times better than GO alone. Our original premise was that the oligomeric system would bind better because of the length of the oligomeric arms and potential for a high degree of flexibility. However, the results clearly showed that the shorter monomeric system was the better ligand/inhibitor. This was due to weaker intramolecular interactions between the aromatic side chains of tyrosine and the aromatic surface of GO. Although these are possible for both systems, they are cooperative and therefore stronger for the oligomeric functionalized GO. As such, the protein must compete and overcome these cooperative intramolecular interactions before it can bind to the functionalized GO, whereas the tyrosines on the surface of the monomeric system interact with the surface of GO through a significantly weaker monovalent interaction, but interact cooperatively with the protein surface.

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Section: Resultsmentioning

confidence: 82%

Synthesis of Oligomeric and Monomeric Functionalized Graphene Oxides and a Comparison of Their Abilities to Perform as Protein Ligands and Enzyme Inhibitors

Aziz

Twyman

2019

ACS Appl. Mater. Interfaces

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“…Recently, Kumar et al ( 2017 ) produced few- and multi-layer graphene on different substrates (Si, SiO 2 /Si, Quartz) by pulsed laser ablation of a highly ordered pyrolytic graphite target, using a pulsed nanosecond Q-switched Nd:YAG laser at 355 nm (3.5 eV) and a Ni catalytic layer. According to the authors, a few layers of graphene were deposited at a substrate temperature of 800°C, whereas multi-layer graphene was formed at a lower substrate temperature of 750°C.…”

Section: Pld Graphene Growth Using Metal Catalystmentioning

confidence: 99%

“… (A) Raman spectra of graphene films deposited on Ni/Si substrate at three different growth temperatures; (B) I D /I G and I 2D /I G intensity ratios of graphene layers as a function of the growth temperature [Reproduced from Kumar et al ( 2017 ) with permission of Springer]. (B) shows the I D /I G and I 2D /I G ratios as a function of growth temperature.…”

Section: Pld Graphene Growth Using Metal Catalystmentioning

confidence: 99%

Review of Graphene Growth From a Solid Carbon Source by Pulsed Laser Deposition (PLD)

et al. 2018

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Graphene is a remarkable two-dimensional (2D) material that is of great interest to both academia and industry. It has outstanding electrical and thermal conductivity and good mechanical behavior with promising applications in electronic devices, supercapacitors, batteries, composite materials, flexible transparent displays, solar cells, and sensors. Several methods have been used to produce either pristine graphene or doped graphene. These include chemical vapor deposition (CVD), mechanical exfoliation, decomposition of SiC, liquid-phase exfoliation, pulsed laser deposition (PLD). Among these methods, PLD, which is routinely used for growing complex oxide thin films has proved to be an alternative to the more widely reported CVD method for producing graphene thin films, because of its advantages. Here we review the synthesis of graphene using PLD. We describe recent progress in preparing pristine graphene and doped graphene by PLD, including deposition processes and characterization. The goal of this complete survey is to describe the advantages of using the technique for graphene growth. The review will also help researchers to better understand graphene synthesis using the PLD technique.

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“…Метод ИЛН используется для получения углеродных слоев в основном двух типов: алмазоподобных пленок (в которых преобладают sp 3 -связи между атомами углерода) [2] и графеновых слоев (с преобладанием sp 2 -гибридизации) [3]. Для нанесения алмазоподобных пленок обычно используются невысокие температуры подложки (типично от +20 до +75 • C), в то время как для формирования графена -высокие температуры процесса (обычно > 700 • C) [4] и (или) использование предварительно нанесенных подслоев металлов-катализаторов (Ni, Co и др.) [5].…”

Section: Introductionunclassified

Легирование Углеродных Нанослоев, Выращенных Импульсным Лазерным Методом

Данилов¹,

Alaferdov

Вихрова³

et al. 2021

Физика И Техника Полупроводников

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Исследованы возможности легирования углеродных слоев, выращиваемых методом импульсного лазерного нанесения, примесями переходных металлов. Изучены состав, оптические и электрические параметры структур на подложках GaAs и Si/SiO2. Показано, что введение таких атомов, как Fe, модифицирует магнитные свойства слоев, вызывая нелинейные магнитополевые зависимости эффекта Холла при температурах вплоть до 300 K. Ключевые слова: импульсное лазерное нанесение, углеродные слои, легирование, примеси переходных металлов.

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Growth of few- and multilayer graphene on different substrates using pulsed nanosecond Q-switched Nd:YAG laser

Cited by 13 publications

References 42 publications

Synthesis of Oligomeric and Monomeric Functionalized Graphene Oxides and a Comparison of Their Abilities to Perform as Protein Ligands and Enzyme Inhibitors

Synthesis of Oligomeric and Monomeric Functionalized Graphene Oxides and a Comparison of Their Abilities to Perform as Protein Ligands and Enzyme Inhibitors

Review of Graphene Growth From a Solid Carbon Source by Pulsed Laser Deposition (PLD)

Легирование Углеродных Нанослоев, Выращенных Импульсным Лазерным Методом

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