Novel single-crystal PbS nanowires directed by [200]

Wang, Zhiyu; Zhao, Bin; Zhang, Fuan; Mao, Weiping; Qian, Guodong; Fan, Xianping

doi:10.1016/j.matlet.2006.12.085

Cited by 14 publications

(13 citation statements)

References 13 publications

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“…It follows that the PbS nanocrystals growth is preferential in the (2 0 0) direction. A similar tendency has been observed in papers [12][13][14]23] as well as recently in this journal [17]. However, in the mentioned papers the milling was not applied and the different synthesis conditions were used.…”

Section: Xrd and Microstructure Characterizationsupporting

confidence: 80%

“…Many synthesis methods have been reported in recent years for the preparation of PbS nanoparticles under different synthesis conditions [8][9][10][11][12][13][14][15][16][17][18][19]. PbS nanocrystals with various morphologies such as hollow spheres [20], wires [21], rods [22], tubes [23] and star-like structures [24] have been synthesized.…”

Section: Introductionmentioning

confidence: 99%

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Mechanochemical synthesis and reactivity of PbS nanocrystals

Baláž¹,

Pourghahramani²,

Achimovičová³

et al. 2011

Journal of Crystal Growth

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Section: Xrd and Microstructure Characterizationsupporting

confidence: 80%

Section: Introductionmentioning

confidence: 99%

Mechanochemical synthesis and reactivity of PbS nanocrystals

Baláž¹,

Pourghahramani²,

Achimovičová³

et al. 2011

Journal of Crystal Growth

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“…It follows that the crystal growth is preferential in the (200) direction when using chelating agent in mechanochemical synthesis. A similar tendency has been observed by Wang et al [17]. However, they prepared PbS nanowires of ~ 7 nm diameter with lengths of several hundreds nanometers.…”

supporting

confidence: 86%

PbS nanostructures synthesized via surfactant assisted mechanochemical route

et al. 2009

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PbS nanocrystals using surfactant assisted mechanochemical route has been successfully prepared. The methods of XRD, SEM, surface area and particle size measurements were used for nanocrystals characterization. The XRD patterns confirmed the presence of galena PbS (JCPDS 5-592) whatever treatment conditions were applied. The strong observable peaks indicate the highly crystalline nature in formation of PbS nanostructures where preferential crystal growth in the (200) direction after chelating agent (EDTANa 2 •2H 2 O) addition has been observed. The mean volume weighted crystallite size 4.9 nm and 35 nm has been calculated from XRD data using Williamson-Hall method for PbS synthesized without and/or with chelating agent, respectively corresponding with surface weighted crystallites sizes of 2.9 and 18.8 nm. The sample prepared without surfactant yields the smaller crystallites and the higher microstrain compared with surfactant assisted synthesis. The obtained results illustrate a possibility to manipulate crystal morphology by combining effect of milling and surfactant application.© Versita Warsaw and Springer-Verlag Berlin Heidelberg.

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“…Among the significant efforts made on synthesizing II-VI, III-V, and IV-VI semiconductor materials, there is a limited body of literature on the synthesis of PbS QDs. 6,7 Furthermore, most of the synthetic efforts reported on PbS nanomaterials target large size with different morphologies, including flower-shaped, dendritic-shaped, hexapodlike, wirelike, tubular, and hollow materials, [8][9][10][11][12][13] leaving the synthesis of small PbS QDs with bandgap in the range of 600-900 nm still challenging.…”

Section: Introductionmentioning

confidence: 99%

Non-Injection and Low-Temperature Approach to Colloidal Photoluminescent PbS Nanocrystals with Narrow Bandwidth

Liu

Ouyang

et al. 2009

J. Phys. Chem. C

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Colloidal photoluminescent (PL) PbS nanocrystals have attracted a lot of attention in various applications such as bioimaging and optical telecommunications due to their tunable bandgap in the near-infrared region of the electromagnetic spectrum. Hot-injection processes seem to be the best to engineer high-quality PbS nanocrystals. However, there is a limited body of literature documented on the syntheses, with little information on synthetic parameters affecting the optical properties of the product. Moreover, small PbS nanocrystals with large bandgap greater than 1.38 eV (ca. 900 nm) and narrow bandwidth are rarely reported, due to the fact that high-temperature growth in hot-injection processes leads to large nanocrystals rapidly. This manuscript deals with our noninjection and low temperature approach to small PbS nanocrystal ensembles with bandgap in wavelength shorter than 900 nm and with narrow bandwidth; the growth temperature can be as low as room temperature. For our noninjection approach, systematic study was performed on synthetic parameters affecting the growth, with the growth temperature in the range of 30-120°C and octadecene (ODE) as a reaction medium. Different acids including oleic aicd (OA) were explored as surface ligands, while two lead source compounds, which are lead oxide (PbO) and lead acetate, and three S source compounds, which are bis(trimethylsilyl)sulfide ((TMS) 2 S), thioacetamide (TAA), and elemental sulfur (S), were investigated. Generally, a solution of a lead precursor in ODE was first prepared via a reaction of a Pb-source compound and an acid; afterward, this solution was mixed with a S-source solution in ODE at room temperature. The use of (TMS) 2 S and OA bestows high-quality PbS nanocrystals, regarding narrow bandwidth of bandgap absorption and photoemission, without storage in dark for digestive and Ostwald ripening leading to selffocusing; in addition to the various acids and Pb and S source compounds explored, feed molar ratios of acid-to-Pb and Pb-to-S, as well as reactant concentrations were thoroughly investigated. Low acid-to-Pb and high Pb-to-S feed molar ratios together with high-reactant concentrations favor the formation of small PbS nanocrystals; meanwhile, from one synthetic batch, the growth of PbS nanocrystals in size is tunable mainly via temperature in addition to growth periods. The PbS nanocrystals exhibit bandwidth (full width at halfmaximum) as narrow as ca. 100 nm with growth temperature of 70°C. Thus, our noninjection approach features easy handling with high reproducibility and high-quality PbS nanocrystals with large bandgap but narrow bandwidth. Finally, bandgap engineering of our as-synthesized PbS nanocrystals was performed straightforwardly at room temperature via the mixing of a solution of Cd oleate in ODE; significant blueshift of bandgap absorption and photoemission with enhanced PL efficiency was accomplished.

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Novel single-crystal PbS nanowires directed by [200]

Cited by 14 publications

References 13 publications

Mechanochemical synthesis and reactivity of PbS nanocrystals

Mechanochemical synthesis and reactivity of PbS nanocrystals

PbS nanostructures synthesized via surfactant assisted mechanochemical route

Non-Injection and Low-Temperature Approach to Colloidal Photoluminescent PbS Nanocrystals with Narrow Bandwidth

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