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      Palladium Nanoparticles Supported on Poly(<italic>N</italic>-vinylpyrrolidone)-Grafted Silica as an Efficient Catalyst for Copper-Free Sonogashira and Suzuki Cross-Coupling Reactions

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          Abstract

          <p>Palladium catalyst based on polyvinylpyrrolidone-silica hybrid support was prepared and exhibited excellent activity and stability in copper, amine and phosphine-free Sonogashira-Hagihara and Suzuki-Miyaura cross-coupling reactions. The polymeric catalyst was applied efficiently in the coupling reactions of chloro (as well as iodo) and bromoarenes. Elemental analysis of Pd by inductively coupled plasma (ICP) and hot filtration test revealed low leaching of the metal into solution from the supported system. The catalyst could be reused many times in repeated cycles without significant decline in its activity.</p>

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          Synthesis of transportation fuels from biomass: chemistry, catalysts, and engineering.

          George Huber, Sara Iborra, Avelino Corma (2006)
          Article 0 comments Cited 1376 times – based on 0 reviews     Review now
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            Rolled-up nanotech on polymers: from basic perception to self-propelled catalytic microengines.

            Yongfeng Mei, Alexander Solovev, Samuel Sanchez … (2011)
            In this tutorial review we describe the recent progress on catalytic microtubular engines fabricated by rolled-up nanotech on polymers. We summarize the technical aspects of the technology and the basic principles that cause the catalytic microengines to self-propel in fuel solutions. The control over speed, directionality and interactions of the microengines to perform tasks such as cargo transportation is also discussed. We compare this technology to other fabrication techniques of catalytic micro-/nanomotors and outline challenges and opportunities for such engines in future studies. Since rolled-up nanotech on polymers can easily integrate almost any type of inorganic material, huge potential and advanced performance such as high speed, cargo delivery, motion control, and dynamic assembly are foreseen--ultimately promising a practical way to construct versatile and intelligent catalytic tubular microrobots.
            Article 0 comments Cited 209 times – based on 0 reviews     Review now
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              Device perspective for black phosphorus field-effect transistors: contact resistance, ambipolar behavior, and scaling.

              Yuchen Du, Han Liu, Yexin Deng … (2014)
              Although monolayer black phosphorus (BP), or phosphorene, has been successfully exfoliated and its optical properties have been explored, most of the electrical performance of the devices is demonstrated on few-layer phosphorene and ultrathin BP films. In this paper, we study the channel length scaling of ultrathin BP field-effect transistors (FETs) and discuss a scheme for using various contact metals to change the transistor characteristics. Through studying transistor behaviors with various channel lengths, the contact resistance can be extracted with the transfer length method (TLM). With different contact metals, we find out that the metal/BP interface has different Schottky barrier heights, leading to a significant difference in contact resistance, which is quite different from previous studies of transition metal dichalcogenides (TMDs), such as MoS2, where the Fermi level is strongly pinned near the conduction band edge at the metal/MoS2 interface. The nature of BP transistors is Schottky barrier FETs, where the on and off states are controlled by tuning the Schottky barriers at the two contacts. We also observe the ambipolar characteristics of BP transistors with enhanced n-type drain current and demonstrate that the p-type carriers can be easily shifted to n-type or vice versa by controlling the gate bias and drain bias, showing the potential to realize BP CMOS logic circuits.
              Article 0 comments Cited 83 times – based on 0 reviews     Review now
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                Author and article information

                Contributors
                Bahman Tamami: Role: ND
                Fatemeh Farjadian: Role: ND
                Soheila Ghasemi: Role: ND
                Hamed Allahyari: Role: ND
                Motahareh Mirzadeh: Role: ND
                Journal
                Journal ID (publisher): jbchs
                Title: Journal of the Brazilian Chemical Society
                Abbreviated Title: J. Braz. Chem. Soc.
                Publisher: Sociedade Brasileira de Química (São Paulo )
                ISSN: 1678-4790
                Publication date (Print): August 2015
                Volume: 26
                Issue: 8
                Pages: 1591-1598
                Affiliations
                [1 ] Shiraz University Iran
                [2 ] Shiraz University of Medical Sciences Iran
                Article
                Publisher ID: S0103-50532015000801591
                DOI: 10.5935/0103-5053.20150129
                SO-VID: 0efce8f5-e495-4a93-8bcf-00c960eb44aa
                License:

                http://creativecommons.org/licenses/by/4.0/

                History
                Product

                SciELO Brazil

                Self URI (journal page): http://www.scielo.br/scielo.php?script=sci_serial&pid=0103-5053&lng=en
                Categories
                Subject: CHEMISTRY, MULTIDISCIPLINARY

                ScienceOpen disciplines: General chemistry
                Keywords: organic-inorganic hybrid support,polyvinylpyrrolidone-grafted silica,palladium nanoparticles,Sonogashira reaction,Suzuki reaction
                Data availability:
                ScienceOpen disciplines: General chemistry
                Keywords: organic-inorganic hybrid support, polyvinylpyrrolidone-grafted silica, palladium nanoparticles, Sonogashira reaction, Suzuki reaction

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