排序方式: 共有11条查询结果,搜索用时 15 毫秒
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The II-VI compound semiconductor CdTe was electrodeposited on InP(100) surfaces using electrochemical atomic layer epitaxy (EC-ALE). CdTe was deposited on a Te-modified InP(100) surface using this atomic layer by atomic layer methodology. The deposit started with formation of an atomic layer of Te on the InP(100) surface, as Cd was observed not to form an underpotential deposition (UPD) layer on InP(100), although it was found to UPD on Te atomic layers. On the In-terminated 'clean' InP(100) surface, Te was deposited at -0.80 V from a 0.1 mM solution of TeO2, resulting in formation of a Te atomic layer and some small amount of bulk Te. The excess bulk Te was then removed by reduction in blank solution at -0.90 V, leaving a Te atomic layer. Given the presences of the Te atomic layer, it was then possible to form an atomic layer of Cd by UPD at -0.58 V to complete the formation of a CdTe monolayer by EC-ALE. That cycle was then repeated to demonstrate the applicability of the cycle to the formation of CdTe nanofilms. Auger spectra recorded after the first three cycles of CdTe deposition on InP(100) were consistent with the layer-by-layer CdTe growth. It is interesting to note that Cd did not form a UPD deposit on the In-terminated InP(100) surface and only formed Cd clusters at an overpotential. This issue is probably related to the inability of the Cd and In to form a stable surface compound. 相似文献
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Rudolph A. Abramovitch Muthiah N. Inbasekaran Adrian L. Miller James M. Hanna 《Journal of heterocyclic chemistry》1982,19(3):509-512
2-(2-Mercaptophenyl)pyridines are prepared from the corresponding phenols and oxidized with N-chloro-succinimide and silver tetrafluoroborate to benzisothiazolo[2,3-a]pyridine salts ( 4 ). The latter do not rearrange thermally or photochemically to benzothiopheno[3,2-b)pyridines ( 19 ) and are attacked by nucleophiles at sulfur rather than in the pyridine ring, to give the original 2-(2-mercaptophenyl)pyridine back in a reaction involving a dismutation. 19 is prepared by rearranging O-[2-(3-bromo-2-pyridyl)-4-nitrophenyl]dimethylthio-carbamate to the S-aryl compound and heating the latter with strong base. 相似文献
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Shanmugasundaram Rajasri Shankramma Kalikeri Subramanian Balachandran Kaliyamoorthy Gowthami Ganesamoorthy Thirunarayanan Meenakshisundaram Swaminathan Inbasekaran Muthuvel 《印度化学会志》2022,99(3):100337
Photocatalysis has recently been regarded as one of the most viable technologies for water treatment. Scholars all over the world are focusing on nanocomposites for water treatment for efficient and effective sanitization of bodies of water. Because of their high surface area, high chemical reactivity, excellent mechanical strength, low cost, and nanoscale composite materials have enormous potential to purify water in a various way. In this study, n-type TiO2 was synthesized and tailored to produce a TiO2/BiOI n–p nanocatalyst for enhanced photodegradation of 2,4-dinitrophenol (2,4-DNP) under UV-A and solar light respectively. Because of the formation of a heterojunction between BiOI and TiO2, the photocatalytic activity in TiO2/BiOI absorbs strongly in both the UV and visible regions and it has a lower recombination rate of the e-/h+ pairs. Furthermore, the generation of OH?, O2?– radicals during the oxidation process is attributed to the photodegradation of 2,4-DNP. The results revealed that the TiO2/BiOI manifest outperformed BiOI and TiO2 in terms of photocatalytic function. XRD, BET, HR-SEM-EDX with ECM, HR-TEM, FT-IR, PL, and UV-DRS techniques determined the photocatalyst composition. The HR-SEM images clearly showed that the particles are less than 27 ?nm in size. Thus, nanocomposite materials have played an important role in water purification. 相似文献
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Mainak Banerjee Ramesh Karri Kuber Singh Rawat Karthick Muthuvel Dr. Biswarup Pathak Dr. Gouriprasanna Roy 《Angewandte Chemie (International ed. in English)》2015,54(32):9323-9327
Organomercurials including methylmercury are ubiquitous environmental pollutants and highly toxic to humans. Now it could be shown that N‐methylimidazole based thiones/selones having an N‐CH2CH2OH substituent are remarkably effective in detoxifying various organomercurials to produce less toxic HgE (E=S, Se) nanoparticles. Compounds lacking the N‐CH2CH2OH substituent failed to produce HgE nanoparticles upon treatment with organomercurials, suggesting that this moiety plays a crucial role in the detoxification by facilitating the desulfurization and deselenization processes. This novel way of detoxifying organomercurials may lead to the discovery of new compounds to treat patients suffering from methylmercury poisoning. 相似文献
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Muthuvel A. Jothibas M. Manoharan C. Jayakumar S. Johnson 《Research on Chemical Intermediates》2020,46(5):2705-2729
Research on Chemical Intermediates - In the present study, biosynthesized CeO2-NPs using Solanum nigrum leaf extract were compared with chemically synthesized one. The synthesized CeO2-NPs were... 相似文献
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Kandasamy Muthuvel 《Order》1990,7(2):179-182
A set
is free for a set mapping F:XP(X) provided xF(y) for any distinct x, y in A. If F maps the reals R into nowhere dense subsets of R, then Bagemihl proved that there is an everywhere dense free set for F, and assuming CH Hechler showed that such an F does not always admit an uncountable free set. In this paper, we show that Bagemihl's theorem cannot be generalized to the generalized linear continua C
for arbitrarily large ordinal , and under GCH we extend Hechler's theorem to C
for every . 相似文献