The subject of this review is the colloidal quantum dot (QD) and specifically the interaction of the QD with proximate molecules. It covers various functions of these molecules, including (i) ligands for the QDs, coupled electronically or vibrationally to localized surface states or to the delocalized states of the QD core, (ii) energy or electron donors or acceptors for the QDs, and (iii) structural components of QD assemblies that dictate QD–QD or QD–molecule interactions. Research on interactions of ligands with colloidal QDs has revealed that ligands determine not only the excited state dynamics of the QD but also, in some cases, its ground state electronic structure. Specifically, the article discusses (i) measurement of the electronic structure of colloidal QDs and the influence of their surface chemistry, in particular, dipolar ligands and exciton-delocalizing ligands, on their electronic energies; (ii) the role of molecules in interfacial electron and energy transfer processes involving QDs, inclu...

Electronic Processes within Quantum Dot-Molecule Complexes.

Advances in methane conversion processes

Recent advances and future prospect in catalysts for oxidative coupling of methane to ethylene: A review

Application of ZnO nanorods loaded on activated carbon for ultrasonic assisted dyes removal: Experimental design and derivative spectrophotometry method.

Facilely synthesized cobalt doped hydroxyapatite as hydroxyl promoted peroxymonosulfate activator for degradation of Rhodamine B.

Oxygen electrocatalysis plays a critical role in the efficiency of important energy conversion and storage systems. While many efforts have focused on designing efficient electrocatalysts for these processes, optimal catalysts that are inexpensive, active, selective, and stable are still being searched. Nonstoichiometric, mixed-metal oxides present a promising group of electrocatalysts for these processes due to the versatility of the surface composition and fast oxygen conducting properties. Herein, we demonstrate, using a combination of theoretical and experimental studies, the ability to develop design principles that can be used to engineer oxygen electrocatalysis activity of layered, mixed ionic-electronic conducting Ruddlesden–Popper (R–P) oxides. We show that a density function theory (DFT) derived descriptor, O2 binding energy on a surface oxygen vacancy, can be effective in identifying efficient R–P oxide structures for oxygen reduction reaction (ORR). Using a controlled synthesis method, well-de...

Efficient Oxygen Electrocatalysis by Nanostructured Mixed-Metal Oxides.

In the present study dealing with hollow-sphere filled polymers, sodium borosilicate hollow glass microspheres (HGM) with the crushing strength of 30,000 psi were used as filler in high density polyethylene (HDPE). HGM remained intact in HDPE matrix with no sign of crushing during the compounding and injection molding operation. Polyethylene-graft-maleic anhydride (PE-g-MAH) used as compatibilizer resulted in nano sized needle like structure in the HGM HDPE interfacial region that resulted in enhanced mechanical properties of HDPE HGM composites.

Interface engineering via compatibilization in HDPE composite reinforced with sodium borosilicate hollow glass microspheres

Electro- and thermal-catalysis by layered, first series Ruddlesden-Popper oxides

New approach for the transformation of metallic waste into nanostructured Fe3O4 and SnO2-Fe3O4 heterostructure and their application in treatment of organic pollutant.

Hydrothermal and microemulsion methods are low temperature methods used to obtain nanostructures of definite morphologies, sizes, facet termination and other structural features which result in the corresponding unique response to chemical, electrochemical or photochemical stimuli. An efficient catalyst to electrochemically split water to produce hydrogen and oxygen is of scientific, economic and societal relevance, especially due to the abundance of the starting material, water, and due to the product hydrogen, which is an ideal fuel, due to its highest mass density and clean combustion in air. In this review we focus on the hydrogen evolution reaction, HER, and the oxygen evolution reaction, OER, activity of the electrocatalysts produced by hydrothermal or microemulsion methods. The variation in electrochemical response resulting from the unique shape, composition and nano-architecture is discussed. Broadly, the catalysts were categorized as binary and ternary metal alloys as well as metal chalcogenides and oxides. This compilation would aid in the design of more effective water splitting electrocatalysts as well as in the selection of appropriate candidates for advanced mechanistic studies.

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Anirban Das

Papers

Efficient Oxygen Electrocatalysis by Nanostructured Mixed-Metal Oxides.

Interface engineering via compatibilization in HDPE composite reinforced with sodium borosilicate hollow glass microspheres

Electro- and thermal-catalysis by layered, first series Ruddlesden-Popper oxides

New approach for the transformation of metallic waste into nanostructured Fe3O4 and SnO2-Fe3O4 heterostructure and their application in treatment of organic pollutant.

Design of diverse nanostructures by hydrothermal and microemulsion routes for electrochemical water splitting