Solvothermal synthesis of hexagonal CdS nanostructures from a single-source molecular precursor

Zhang, Yongcai; Wang, Gui Yun; Hu, Xiao

doi:10.1016/j.jallcom.2006.07.065

Cited by 63 publications

(32 citation statements)

References 40 publications

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“…Cadmium sulfide (CdS) is a II-VI group semiconductor, and as such, its nanoparticles have generated great interest due to their unique sizedependent physical and chemical properties [7]. CdS, a compound of direct band gap of 2.42 eV in visible region [8,9] at room temperature, has been extensively applied in Abstract Cadmium sulfide (CdS) quantum dots (QDs) with cubic phase were prepared using simple precursors by chemical precipitation technique, and their thin films were grown on glass substrates by chemical bath deposition. The obtained quantum dots were characterized for their structural, morphological, optical, thermal and electrical properties using X-ray diffraction (XRD), field emission transmission electron microscopy, UV-visible absorption spectroscopy, Raman spectroscopy, photoluminescence, thermogravimetric analysis/differential thermal analysis and low-temperature electrical transport measurements, respectively.…”

Section: Introductionmentioning

confidence: 99%

CdS quantum dots: growth, microstructural, optical and electrical characteristics

et al. 2016

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presence of Cd and S in almost stoichiometric ratio in the prepared CdS QDs. Micro-Raman spectroscopic studies also yield convincing evidence for the transformation of structure. The emission spectra of CdS QDs show peak centered at 541 nm, which is attributed to the presence of cadmium vacancies in the lattice. The DC resistivity data at low temperatures are qualitatively consistent with the variable-range hopping model, and the density of states at the Fermi level is determined.

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Section: Introductionmentioning

confidence: 99%

CdS quantum dots: growth, microstructural, optical and electrical characteristics

et al. 2016

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“…Morphology-controlled synthesis of nano-/micro-crystals of semiconductor materials have attracted great interest because their optoelectronic properties are closely related to their sizes and shapes [1][2][3][4][5][6][7][8]. Compared to mono-morphological structures, hierarchical structures may show unique properties by combining the features of micrometer-and nanometer-scaled building blocks in one crystal [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Novel hierarchical CdS crystals by an amino acid mediated hydrothermal process

Qiu

Yang

et al. 2011

Journal of Alloys and Compounds

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“…The PbS and CdS nanowires were grown by the conventional SLS mechanism, [1] except that the elements of the semiconductor phases were derived from the thermal decomposition of the single-source diethyldithiocarbamate precursors [Pb-(S 2 CNEt 2 ) 2 ] and [Cd(S 2 CNEt 2 ) 2 ], respectively. These precursors have been previously used for the MOCVD growth of PbS and CdS thin films, [15] the vapor-liquid-solid (VLS) growth of CdS nanowires, [16] and the solution-based growth of PbS [17] and CdS [18] nanostructures. Bismuth nanoparticles were used to catalyze SLS growth, as we have found them Scheme 1.…”

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confidence: 99%

The Use of Single‐Source Precursors for the Solution–Liquid–Solid Growth of Metal Sulfide Semiconductor Nanowires

Sun¹,

Buhro²

2008

Angew Chem Int Ed

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Herein we describe the syntheses of high-quality PbS and CdS nanowires by the solution-liquid-solid (SLS) mechanism from single-source precursors. The SLS synthesis of nanowires offers several advantages over other methods, including purposeful control of nanowire mean diameters, narrow diameter distributions, small diameters in the quantumconfinement regime, control of surface passivation, nanowire solubility, and ease of implementation.[1] However, although SLS growth has been applied to a wide range of II-VI, [2] III-V, [3] and IV-VI [4] nanowire compositions, the method is not yet generally applicable, as each new composition requires extensive trial-and-error experimentation to identify appropriate precursors and reaction conditions. Our prior work has employed separate metallic-element and nonmetallic-element precursors to synthesize high-quality, compound-semiconductor nanowires. [2a,d, 3d,g] Finding dual precursors with appropriately balanced reactivities has often been a primary origin of the extensive empirical experimentation required to develop a given, successful SLS nanowire synthesis. In several cases, such as for metal-sulfide semiconductors, the dualprecursor SLS approach has failed to produce highly crystalline, diameter-controlled nanowires (see Figure S1 in the Supporting Information).We now report that the use of single-source precursors, in which the metallic and nonmetallic semiconductor constituents are combined in a single molecule, solves the reactivitybalance problem, resulting in the successful SLS growth of PbS and CdS nanowires. Therefore, the single-source approach has the potential to greatly extend the generality of the SLS method for semiconductor-nanowire synthesis. As single-source precursors have been extensively developed for use in the MOCVD growth of thin films, [5] suitable precursors for the SLS growth of many new nanowire compositions are likely already available.Semiconductor nanowires have drawn increasing interest for their potential applications in electronic and photonic devices [6] such as field-effect transistors, light-emitting diodes, logic gates, lasers, waveguides, and solar cells. Multipleexciton generation was recently discovered in nanocrystals of PbS and PbSe. [7] Specifically, up to four excitons (quantum yield up to 430 %) were produced by absorption of a single photon in PbS nanocrystals.[7a] Although the ultrafast nonradiative Auger recombination of multiexcitons prevents the carriers from being harvested so far, this obstacle may be overcome by using elongated nanostructures, such as nanorods and nanowires.[8] If the rate of Auger recombination is significantly slower in 1D nanostructures, the efficiency of photovoltaic energy conversion might be greatly enhanced. Additionally, PbS has a relatively large exciton Bohr radius of 20 nm, [9] which makes it one of the ideal candidates for investigating quantum-confinement effects in relatively large nanostructures. The high quality of the PbS nanowires reported here enabled observation of discrete excito...

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Solvothermal synthesis of hexagonal CdS nanostructures from a single-source molecular precursor

Cited by 63 publications

References 40 publications

CdS quantum dots: growth, microstructural, optical and electrical characteristics

CdS quantum dots: growth, microstructural, optical and electrical characteristics

Novel hierarchical CdS crystals by an amino acid mediated hydrothermal process

The Use of Single‐Source Precursors for the Solution–Liquid–Solid Growth of Metal Sulfide Semiconductor Nanowires

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