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Influence of Oxidation and Deposition Process on Electrical Properties of Graphene Films

材料科学与工程（中英文B版） 2014年第10期4卷 318-321页

作者： Olena Okhay rahul krishna Luis M. Guerrat Joao Ventura Elby Titus Jose Gracio Nanotechnology Research Division Center for Mechanical Technology and Automation (TEMA) Department of MechanicalEngineering University of Aveiro Portugal Materials Physics Institute of the University of Porto (IFIMUP) Porto 4169-007 Portugal

The influence of reducibility of graphene oxide (GO) by hydrazine hydrate on their electrical properties was investigated. Reduced GO (rGO) films were obtained by mixing of graphene oxide (GO) solution with hydrazine hydrant (HH) (10% and 50% of concentration) and final dropping on Si substrate or by dropping of GO solution on Si substrate already covered by HH (10% or 50% of concentration). Electrical measurements show semiconductor value ofelectrical conductivity for the samples with high concentration of HH (10-4 A at applied ±10 V). At the same time low concentration of HH leads to much smaller value of conductivity (10-7 A at ± 10 V).

关键词：氧化石墨电学性能沉积工艺溶液混合低浓度 Si衬底电气测量水合肼

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Molybdenum disulfide-graphene van der Waals heterostructures as stable and sensitive electrochemical sensing platforms

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Tungsten 2020年第4期2卷 411-422页

作者： Stelbin Peter Figerez Kiran Kumar Tadi krishna Rani Sahoo rahul Sharma Ravi K.Biroju Aleena Gigi KAiswarya Anand Golap Kalita Tharangattu N.Narayanan Tata Institute of Fundamental Research Hyderabad 500046India Division of Healthcare Advancement Innovation and ResearchVellore Institute of Technology(VIT)Chennai 600127India Department of Physical Science and Engineering Nagoya Institute of TechnologyNagoya 466‑8555Japan

Atomic layers are sought after for molecular sensing due to their available high surface interaction area,and different types of monolayers are attempted for sensing in the recent ***,their chemical stability towards these molecules is questioned in recent times and alternate methods need to be developed to circumvent such issues,while maintaining high ***,the van der Waals(vdWs)stacks of molybdenum disulfide(MoS_(2))and graphene are shown for their stable electrochemical sensing towards ascorbic acid(AA)and dopamine(DA)-two important *** is known to chemically react with MoS_(2) leading to unstable sensing platform,while here the graphene coverage is shown to protect the MoS_(2) even from low-energy plasma exposure while keeping the same high *** proving the graphene-based protection of the sensor,such a sensing platform is shown for its applicability in DA sensing,where it is found to give a linear response in a wide range of concentrations(2.5 to 600μmol·L^(−1))and even selective sensing in the presence of *** a stack is found to be not merely giving protection to the beneath MoS_(2) layer but also the inter-layer charge transfer due to work function differences being beneficial in bringing fast and high sensitivity to the next-generation sensors and point-of-care devices.

关键词： Graphene Molecular sensing MoS_(2)etching MoS_(2)protection van der Waals structures Electrochemical sensing Ascorbic acid Dopamine

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Isolation of Marine Actinomycetes from the Mangrove Swamps for Biotechnological Exploration

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Journal of Life Sciences 2011年第12期5卷 1030-1036页

作者： Rajesh C. Patil Abhishek D. Mule Gajanan V. Mali Rajmahammad R. Tamboli rahul M. Khobragade Sanjay K. Gaikwad Vasanti I. Katchi Dhanashree Patil Bhavan＇s College Andheri （w） Mumbai 400058 India Department of Microbiology M.B.S.K. Kanya Mahavidyalay Kadegaon Sagli 415304 India Department of Microbiology M.U. Mahavidyalaya Udgir Latur 413512 India Department of Microbiology Dr. Babasaheb Ambedkar Marathawada University Sub-campus Osmanabad 431001 India Department of Cell ＆ Molecular Biology Rajiv Gandhi Institute of IT and Biotechnology Bharati Vidyapeeth Pune 411043 India Gopal krishna College Kolhapur 416011 India

The mangroves are specialized marine environments widely distributed along the coast lines, which support biologically diverse groups of organisms including microbes. The microorganisms present in this ecosystem contribute significantly in the food web of the tropical marine ecosystem. In the present investigation, Actinomycete isolates obtained from mangrove sediments have been studied for diversity as well as for their bioactive potential. Seven different Actinomycete isolates （MS 1-MS7） were obtained from the sediments collected from the mangrove swamps. The phylogenetic analysis of these isolates showed that out or seven isolates, 3 isolates belong to Streptomyces sp., which has bioactive potential as several bioactive metabolites have been isolated from this group. One bacterium showed genetic similarity with Corynebacterium sp.. The microbes from this group are used for very important industrial applications. Three Actinomycete isolates showed very low similarity with the reported strains from the gene bank. In suggests that, these cultures could be novel and further research work is warranted to prove this speculation. In antagonistic studies, three Actinomycete isolates showed promising results. This investigation highlights the importance of mangrove ecosystem as a rich source of diverse Actinomycete strains for biotechnological applications.

关键词： Actinomycetes mangrove swamps phylogenetic analysis bioactivity.

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