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Molecular-scale quantum dots from carbon nanotube heterojunctions.
Chandra, Bhupesh,Bhattacharjee, Joydeep,Purewal, Meninder,Son, Young-Woo,Wu, Yang,Huang, Mingyuan,Yan, Hugen,Heinz, Tony F,Kim, Philip,Neaton, Jeffrey B,Hone, James American Chemical Society 2009 Nano letters Vol.9 No.4
<P>Carbon nanotube heterojunctions (HJs), which seamlessly connect nanotubes of different chiral structure using a small number of atomic-scale defects, represent the ultimate scaling of electronic interfaces. Here we report the first electrical transport measurements on a HJ formed between semiconducting and metallic nanotubes of known chiralities. These measurements reveal asymmetric IV-characteristics and the presence of a quantum dot (QD) with approximately 60 meV charging energy and approximately 75 meV level spacing. A detailed atomistic and electronic model of the HJ enables the identification of specific defect arrangements that lead to the QD behavior consistent with the experiment.</P>
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Raj Kumar Salar,Pooja Sharma,Sukhvinder Singh Purewal 셀메드 세포교정의약학회 2015 TANG Vol.5 No.2
Antioxidative and free radical scavenging properties of different stem extracts of Euphorbia trigona were evaluated and correlated with its total phenolic content. Aqueous, acetone and methanolic extracts of shade dried stem were obtained and were concentrated in vacuo. The antioxidant and free radical scavenging activities of stem extracts was determined by 2,2-Diphenyl-1-picrylhydrazyl (DPPH) scavenging assay, reducing power assay, deoxyribose degradation assay and Fe2+chelating assay. Total phenolic contents (TPC) were evaluated using Folin-Ciocalteu reagent. The results confirmed that the plant is a rich source of polyphenolic compounds which are invariably higher compared to other herbs. All extracts showed TPC in the range of 146.6 – 168.6 mg/g gallic acid equivalents at 300 µg/ml of extract. Among the three extracts ME showed highest scavenging activity as evidenced by maximum scavenging of DPPH (83.2%), OH• radicals (94.81%), Fe2+chelating activity (88.59%) and a high reducing power 0.623 at 300 µg/ml. Our results demonstrate that Euphorbia trigona, an unexplored xerophytic plant could be potential source of natural antioxidants and phytotherapeutic agents. The plant possess invariably high amount of polyphenolic compounds with a broad spectrum of antioxidant properties and could be further used for food, feed and pharmaceutical applications.
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