Aqueous synthesis of CdS and CdSe/CdS tetrapods for photocatalytic hydrogen generation

Vaneski, Aleksandar; Schneider, Julian; Susha, Andrei S.; Rogach, Andrey L.

doi:10.1063/1.4855795

Cited by 20 publications

(14 citation statements)

References 46 publications

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“…Among more complex anisotropic semiconductor/semiconductor core/shell structures CdSe/CdS tetrapods [121], CdSe/CdE (E:S, Se, Te) octapods [122], CdSe/CdS "dot-in-plate" (spherical core, disk-shaped shell) [123] and ZnE/CdS-Pt (E=Se, Te) dots in rods heterostructures comprising a Pt seed at one end [124] can be found. The latter exhibit interesting photocatalytic properties for hydrogen production.…”

Section: Compound Semiconductors Type-i Vs Type-ii Structuresmentioning

confidence: 99%

Engineered inorganic core/shell nanoparticles

et al. 2014

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It has been for a long time recognized that nanoparticles are of great scientific interest as they are effectively a bridge between bulk materials and atomic structures. At first, size effects occurring in single elements have been studied. More recently, progress in chemical and physical synthesis routes permitted the preparation of more complex structures. Such structures take advantages of new adjustable parameters including stoichiometry, chemical ordering, shape and segregation opening new fields with tailored materials for biology, mechanics, optics magnetism, chemistry catalysis, solar cells and microelectronics. Among them, core/shell structures are a particular class of nanoparticles made with an inorganic core and one or several inorganic shell layer(s). In earlier work, the shell was merely used as a protective coating for the core. More recently, it has been shown that it is possible to tune the physical properties in a larger range than that of each material taken separately. The goal of the present review is to discuss the basic properties of the different types of core/shell nanoparticles including a large variety of heterostructures. We restrict ourselves on all inorganic (on inorganic/inorganic) core/shell structures. In the light of recent developments, the applications of inorganic core/shell particles are found in many fields including biology, chemistry, physics and engineering. In addition to a representative overview 2 of the properties, general concepts based on solid state physics are considered for material selection and for identifying criteria linking the core/shell structure and its resulting properties. Chemical and physical routes for the synthesis and specific methods for the study of core/shell nanoparticle are briefly discussed.

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Section: Compound Semiconductors Type-i Vs Type-ii Structuresmentioning

confidence: 99%

Engineered inorganic core/shell nanoparticles

et al. 2014

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“…The synthesis of CdSe seeds and CdSe@CdS seeded rods has been well studied 21,24,25 . Slight modifications to the amounts, temperatures, and times for steps of the synthesis of these substrate particles can be used to tune their length, diameter, and/or morphology.…”

Section: Discussionmentioning

confidence: 99%

Photochemical Oxidative Growth of Iridium Oxide Nanoparticles on CdSe@CdS Nanorods

Kalisman

Nakibli

Amirav

2016

JoVE

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We demonstrate a procedure for the photochemical oxidative growth of iridium oxide catalysts on the surface of seeded cadmium selenidecadmium sulfide (CdSe@CdS) nanorod photocatalysts. Seeded rods are grown using a colloidal hot-injection method and then moved to an aqueous medium by ligand exchange. CdSe@CdS nanorods, an iridium precursor and other salts are mixed and illuminated. The deposition process is initiated by absorption of photons by the semiconductor particle, which results with formation of charge carriers that are used to promote redox reactions. To insure photochemical oxidative growth we used an electron scavenger. The photogenerated holes oxidize the iridium precursor, apparently in a mediated oxidative pathway. This results in the growth of high quality crystalline iridium oxide particles, ranging from 0.5 nm to about 3 nm, along the surface of the rod. Iridium oxide grown on CdSe@CdS heterostructures was studied by a variety of characterization methods, in order to evaluate its characteristics and quality. We explored means for control over particle size, crystallinity, deposition location on the CdS rod, and composition. Illumination time and excitation wavelength were found to be key parameters for such control. The influence of different growth conditions and the characterization of these heterostructures are described alongside a detailed description of their synthesis. Of significance is the fact that the addition of iridium oxide afforded the rods astounding photochemical stability under prolonged illumination in pure water (alleviating the requirement for hole scavengers). Video LinkThe video component of this article can be found at

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“…[ 7 ] These tetrapod heterostructures also show excellent catalytic performance toward photocatalytic hydrogen evolution. [ 8 ] In 2016, our group reported the controlled epitaxial growth of wurtzite‐phase CdS and CdSe nanorods on hexagonal‐shaped nanoplates with different crystal structures, resulting in the formation of three different hierarchical heterostructures. [ 9 ] However, all the aforementioned studies only focus on the preparation of crystalline/crystalline heterostructures.…”

Section: Figurementioning

confidence: 99%

Synthesis of Palladium‐Based Crystalline@Amorphous Core–Shell Nanoplates for Highly Efficient Ethanol Oxidation

et al. 2020

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Heterostructures consisting of distinct components have attracted considerable attention due to their unique properties and promising applications in catalysis enabled by the synergistic effect among different components. [1][2][3][4][5] Since phase engineering of nanomaterials (PEN) provides various strategies to rationally design and synthesize nanomaterials with novel crystal phases, [6] the delicate modu lation of crystal phases of each component in heterostructures with diverse morpho logies becomes possible, which is of great importance to realize tunable physical and chemical properties and enhanced perfor mances. In addition to controlling their compositions, morphologies, architec tures, facets, sizes, and dimensionalities, tremendous efforts have been devoted to constructing heterostructures con sisting of different phases during recent years. For example, highly luminescent CdSe/CdS heterostructure with tetrapod Phase engineering of nanomaterials (PEN) offers a promising route to rationally tune the physicochemical properties of nanomaterials and further enhance their performance in various applications. However, it remains a great challenge to construct well-defined crystalline@amorphous core-shell heterostructured nanomaterials with the same chemical components. Herein, the synthesis of binary (Pd-P) crystalline@amorphous heterostructured nanoplates using Cu 3−χ P nanoplates as templates, via cation exchange, is reported. The obtained nanoplate possesses a crystalline core and an amorphous shell with the same elemental components, referred to as c-Pd-P@a-Pd-P. Moreover, the obtained c-Pd-P@a-Pd-P nanoplates can serve as templates to be further alloyed with Ni, forming ternary (Pd-Ni-P) crystalline@amorphous heterostructured nanoplates, referred to as c-Pd-Ni-P@a-Pd-Ni-P. The atomic content of Ni in the c-Pd-Ni-P@a-Pd-Ni-P nanoplates can be tuned in the range from 9.47 to 38.61 at%. When used as a catalyst, the c-Pd-Ni-P@a-Pd-Ni-P nanoplates with 9.47 at% Ni exhibit excellent electrocatalytic activity toward ethanol oxidation, showing a high mass current density up to 3.05 A mg Pd −1 , which is 4.5 times that of the commercial Pd/C catalyst (0.68 A mg Pd −1 ).

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Aqueous synthesis of CdS and CdSe/CdS tetrapods for photocatalytic hydrogen generation

Cited by 20 publications

References 46 publications

Engineered inorganic core/shell nanoparticles

Engineered inorganic core/shell nanoparticles

Photochemical Oxidative Growth of Iridium Oxide Nanoparticles on CdSe@CdS Nanorods

Synthesis of Palladium‐Based Crystalline@Amorphous Core–Shell Nanoplates for Highly Efficient Ethanol Oxidation

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