Anumol Ashok

Publications (8) View all

• Article: Pristine nanomaterials: synthesis, stability and applications.

  Paromita Kundu, E A Anumol, N Ravishankar
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  ABSTRACT: Capping-free and linker-free nanostructures/hybrids possess superior properties due to the presence of pristine surfaces and interfaces. In this review, various methods for synthesizing pristine nanomaterials are presented along with the general principles involved in their morphology control. In wet chemical synthesis, the interplay between various reaction parameters results in diverse morphology. The fundamental principles behind the evolution of morphology including nanoporous aggregates of metals and other inorganic materials, 2D nanocrystals of metals is elucidated by capping-free methods in aqueous medium. In addition, strategies leading to the attachment of bare noble metal nanoparticles to functional oxide supports/reduced graphene oxide has been demonstrated which can serve as a simple solution for obtaining thermally stable and efficient supported catalysts with free surfaces. Solution based synthesis of linker-free oxide-semiconductor hybrids and capping-free metal nanowires on substrates are also discussed in this context with ZnO/CdS and ultrathin Au nanowires as examples. A simple and rapid microwave-assisted method is highlighted for obtaining such hybrids which can be employed for high-yield production of similar materials.
  Nanoscale 05/2013; · 5.91 Impact Factor
• Article: Existing and emerging strategies for the synthesis of nanoscale heterostructures.

  Paromita Kundu, E A Anumol, C Nethravathi, N Ravishankar
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  ABSTRACT: Development of new multifunctional nanostructures relies on the ability to make new materials at the nanoscale with control over size, shape and composition. While this control is extremely important to tune several properties, an alternative strategy is to create active interfaces between two or more nanostructures to form nanoscale heterostructures. In these heterostructures, the interfaces play a key role in stabilizing and enhancing the efficiency of the individual components for various applications. In this article, we discuss synthesis methods of different types of nanoscale heterostructures and the role of interfaces in various applications. We present the current state-of-the-art in designing heterostructures and possible upcoming synthetic strategies with their advantages and disadvantages. We present how such heterostructures are highly efficient for catalytic, photovoltaic and nanoelectronic applications drawing several examples from our own studies and from the literature.
  Physical Chemistry Chemical Physics 11/2011; 13(43):19256-69. · 3.57 Impact Factor
• Article: Existing and emerging strategies for the synthesis of nanoscale heterostructures

  Paromita Kundu, E.A. Anumol, C. Nethravathi, N. Ravishankar
  Physical Chemistry Chemical Physics 01/2011; doi: 10.1039/C1CP22343G, Perspective. · 3.57 Impact Factor
• Article: Highly dispersed ultrafine Pt and PtRu nanoparticles on graphene: formation mechanism and electrocatalytic activity.

  C Nethravathi, E A Anumol, M Rajamathi, N Ravishankar
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  ABSTRACT: We demonstrate a robust strategy for obtaining a high dispersion of ultrafine Pt and PtRu nanoparticles on graphene by exploiting the nucleation of a metal precursor phase on graphite oxide surfaces. Our method opens up new possibilities to engineer graphene-based hybrids for applications in multifunctional nanoscale devices.
  Nanoscale 11/2010; 3(2):569-71. · 5.91 Impact Factor
• Article: Surface diffusion driven nanoshell formation by controlled sintering of mesoporous nanoparticle aggregates.

  E A Anumol, B Viswanath, P G Ganesan, Yunfeng Shi, Ganpati Ramanath, N Ravishankar
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  ABSTRACT: We report a general method for the synthesis of hollow structures of a variety of functional inorganics by partial sintering of mesoporous nanocrystal aggregates. The formation of a thin shell initiates the transport of mass from the interior leading to growth of the shell. The principles are general and the hollow structures thus produced are attractive for many applications including catalysis, drug delivery and biosensing.
  Nanoscale 08/2010; 2(8):1423-5. · 5.91 Impact Factor