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Carbon Letters, Vol. 27 - New Issue Alert
Carbon Letters, Vol. 26 - New Issue Alert
Carbon Letters, Vol. 25 - New Issue Alert
Lee, Young-Seak
(Chungnam Nat'l Univ., Korea)
Carbon Letters aims to be a comprehensive journal with complete coverage of carbon materials and carbon-rich molecules. These materials range from, but are not limited to, diamond and graphite through chars, semicokes, mesophase substances, carbon fibers, carbon nanotubes, graphenes, carbon blacks, activated carbons, pyrolytic carbons, glass-like carbons, etc. Papers on the secondary production of new carbon and composite materials from the above mentioned various carbons are within the scope of the journal. Papers on organic substances, including coals, will be considered only if the research has close relation to the resulting carbon materials. Carbon Letters also seeks to keep abreast of new developments in their specialist fields and to unite in finding alternative energy solutions to current issues such as the greenhouse effect and the depletion of the ozone layer. The renewable energy basics, energy storage and conversion, solar energy, wind energy, water energy, nuclear energy, biomass energy, hydrogen production technology, and other clean energy technologies are also within the scope of the journal. Carbon Letters invites original reports of fundamental research in all branches of the theory and practice of carbon science and technology.
CURRENT ISSUE : Vol. 27, Number 1, July, 2018
Substitutional boron doping of carbon materials
Sumin Ha1, Go Bong Choi1, Seungki Hong1,2, Doo Won Kim2 and Yoong Ahm Kim1,3,♠
A simple, but effective means of tailoring the physical and chemical properties of carbon materials should be secured. In this sense, chemical doping by incorporating boron or nitrogen into carbon materials has been examined as a powerful tool which provides distinctive advantages over exohedral doping. In this paper, we review recent results pertaining methods by which to introduce boron atoms into the sp2 carbon lattice by means of high-temperature thermal diffusion,...
The effect of pore structure and surface properties of carbon nanotube films on the performance of a lithium sulfur battery
Hyeonjun Song1, Yunjae Hwang1, Vimal Tiwari Kumar2 and Youngjin Jeong1,2,♠
We fabricated a Li-S battery with post-treated carbon nanotube (CNT) films which offered better support for sulfur, and investigated the effect of the surface properties and pore structure of the post-treated CNT films on Li-S battery performance. Post-treatments, i.e., acid treatment, unzip process and cetyltrimethylammonium bromide (CTAB) treatment, effectively modified the surface properties and pore structure of the CNT film. The modified pore structure impacted the ability o...
Graphene nanosheets encapsulated poorly soluble drugs with an enhanced dissolution rate
Shou-Cang Shen1,♠, Wai Kiong Ng1, Kumaran Letchmanan1, Ron Tau Yee Lim1 and Reginald Beng Hee Tan1,2,♠
In this study, graphene oxide(GO) was used as drug carriers to amorphize poorly watersoluble drugs via a co-spray drying process. Two poorly water-soluble drugs, fenofibrate and ibuprofen, were investigated. It was found that the drug molecules could be in the graphene nanosheets in amorphous or nano crystalline forms and thus have a significantly enhanced dissolution rate compared with the counterpart crystalline form. In addition, the dissolution of the amorphous drug enwrapped...
Assembly of chemically reduced graphene oxide with folic acid functionalized with pyrene moieties and electrochemical sensing of folate receptors
Binhee Kwon1, Jongyeap Park1, Woojun Jeong1, Guembi Jeong1, Hyeong Seon Ryu2, Peerasak Paoprasert3,♠, Sung Young Park1,4,♠ and Insik In1,5,♠
To formulate folate receptor (FR)-specific graphene-based electrochemical electrodes, a folic acid (FA) derivative attached with two pyrene molecules on the glutamate tail of FA was synthesized. The resulting pyrene-functionalized FA (FA-Py) presented the spontaneous noncovalent binding on chemically reduced graphene oxides (rGO) through an π-π interaction. Ultrathin morphology, high water-resistance, and preservation of intact FR-specific pteroates from the rGO/FA-Py assembly al...
Single-walled carbon nanotubes directly-grown from orientated carbon nanorings
Tomohiro Tojo1,♠, Ryoji Inada1, Yoji Sakurai1 and Yoong Ahm Kim2,♠
Surfactant-wrapped separation methods of metallic and semiconducting single-walled carbon nanotubes (SWCNTs) can result in large changes in intrinsic physical and chemical properties due to electronic interactions between a nanotube and a surfactant. Our approach to synthesize SWCNTs with an electronic feature relied on utilizing carbon nanorings, [n] cycloparaphenylenes ([n]CPPs), which are the fundamental unit of armchair type SWCNTs (a-SWCNTs) that possess a metallic feature w...
Surface modification of graphene oxide by citric acid and its application as a heterogeneous nanocatalyst in organic condensation reaction
Ali Maleki, Zoleikha Hajizadeh and Hamid Abbasi
A citric acid functionalized graphene oxide nanocomposite was successfully synthesized and the structure and morphology of the nanocatalyst were comprehensively characterized by Fourier transform infrared spectroscopy, energy-dispersive X-ray analysis, X-ray diffraction patterns, atomic force microscopy images, scanning electron microscopy images, transmission electron microscopy images, and thermogravimetric analysis. The application of this nanocatalyst was exemplified in an im...
Potentiometric sensor of graphene oxide decorated with silver nanoparticles/molecularly imprinted polymer for determination of gabapentin
Nehad A. Abdallah1,2,♠ and Heba F. Ibrahim2
An imprinted potentiometric sensor was developed for direct and selective determination of gabapentin. Sensor is based on carbon paste electrode adapted by graphene oxide that is decorated with silver nanoparticles and mixed with molecularly imprinted polymers nanoparticles using gabapentin as a template molecule. The synthesized nanoparticles were characterized by Fourier transmission infrared spectroscopy, transmission electron microscopy and X-ray diffraction. Under optimal ex...
Anatase TiO2-doped activated carbon fibers prepared by ultrasonication and their capacitive deionization characteristics
Da Hee Kang, Hanjoo Jo, Min-Jung Jung, Kyoung Hoon Kim and Young-Seak Lee
TiO2-doped activated carbon fibers (ACFs) were successfully prepared as capacitive deionization (CDI) electrode materials by facile ultrasonication-assisted process. ACFs were treated with titanium isopropoxide (TTIP) and isopropyl alcohol solutions of different concentrations and then calcinated by ultrasonication without heat-treatment. The results show that a certain amount of anatase TiO2 was present on the ACF surface. The specific capacitance of the Ti...
Comparative study on carboxylated styrene butadiene rubber composites reinforced by hybrid fillers of rice bran carbon and graphite carbon
Yuan Fan1, Qingyuan Li1, Xiangxu Li1, Dam hee Lee1 and Ur Ryong Cho1,2,♠
In the present work, a comparative study of the mechanical behavior of two series of elastomeric composites, based on carboxylated styrene butadiene rubber (X-SBR) and reinforced with rice bran carbon (RBC) and graphite, is reported. Hybrid composites of X-SBR filled with RBC-graphite were also investigated in terms of the cure characteristics, hardness, tensile properties, abrasion resistance, and swelling. It was observed that the cure times decreased with the incorporation of ...
Preparation of melamine-grafted graphene oxide and evaluation of its efficacy as a flame retardant additive for polypropylene
Parisa Monji, Reza Jahanmardi and Milad Mehranpour
The present study aimed to prepare a novel efficient flame retardant additive for polypropylene. The new flame retardant was prepared by chemical grafting of melamine to graphene oxide with the aid of thionyl chloride. Fourier-transform infrared spectroscopy and thermogravimetric analysis proved that melamine had been successfully grafted to the graphene oxide. The modified graphene oxide was incorporated into polypropylene via solution mixing followed by anti-solvent precipitati...
Detection of electromagnetic interference shielding effect of Hanji mixed with carbon nanotubes using nuclear magnetic resonance techniques
Young Seok Byun1,2, Shin Ae Chae1, Geun Yeong Park3, Haeseong Lee3,♠ and Oc Hee Han1,2,4,♠
Electromagnetic interference (EMI) shielding is an important issue in modern daily life due to the increasing prevalence of electronic devices and their compact design. This study estimated EMI-shielding effect (EMI-SE) of small (8-14×17 mm) Hanji (Korean traditional paper) doped with carbon nanotubes (CNTs) and compared to Hanji without CNT using 2H (92.1 MHz) and 23Na (158.7 MHz) nuclear magnetic resonance (NMR) peak area data obtained from 1 M NaCl in D
A novel free-standing anode of CuO nanorods in carbon nanotube webs for flexible lithium ion batteries
Sehyun Lee1,*, Hyeonjun Song2,*, Jun Yeon Hwang3, Seung Min Kim3 and Youngjin Jeong1,2,♠
Free-standing electrodes of CuO nanorods in carbon nanotubes (CNTs) are developed by synthesizing porous CuO nanorods throughout CNT webs. The electrochemical performance of the free-standing electrodes is evaluated for their use in flexible lithium ion batteries (LIBs). The electrodes comprising CuO@CNT nanocomposites (NCs) were characterized by charge-discharge testing, cyclic voltammetry, and impedance measurement. These structures are capable of accommodating a high number of...
X-ray diffraction analysis of the crystallinity of phenolic resin- derived carbon as a function of the heating rate during the carbonization process
Dong-Su Kang, Sang-Min Lee, Sang-Hye Lee and Jae-Seung Roh
Electrochemical properties of KOH-activated lyocell-based carbon fibers for EDLCs
Jin-Young Jung1 and Young-Seak Lee2,♠
Control of interlayer spacing of expanded graphite for improved hydrogen storage capacity
Hyo In Lee, Won Jong Kim, Young-Jung Heo, Yeong-Rae Son and Soo-Jin Park