Growth of PbS microtubes with quadrate cross sections

Wang, Weixing; Li, Qing; Li, Ming; Lin, Hua; Hong, Lijun

doi:10.1016/j.jcrysgro.2006.10.262

Cited by 15 publications

(9 citation statements)

References 40 publications

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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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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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“…Various inorganic nanomaterials such as oxides [1][2][3][4][5][6][7][8], sulfides [9][10][11] and nitrides [12][13][14], as well as elemental materials have been fabricated and characterized [15][16][17][18][19]. One of the oxide semiconductors of interest is tellurium dioxide (TeO 2 ) with physical and chemical properties that make it suitable for various technological applications such as deflectors [20], modulators [21], dosimeters [22,23], optical storage material [24], laser devices [25] and gas sensors [26,27].…”

Section: Introductionmentioning

confidence: 99%

Transition from n- to p-type electrical conductivity induced by ethanol adsorption on α-tellurium dioxide nanowires

Siciliano

Tepore

Micocci

et al. 2009

Sensors and Actuators B: Chemical

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“…Moreover, these materials have shown interesting applications in the emerging area of optoelectronic devices. Various inorganic nano and micromaterials have been fabricated and characterized including oxides [7][8][9], sulfides [10,11], nitrides [12,13] and elemental materials [14,15]. One of the elemental semiconductors of interest is tellurium with physical and chemical properties that make it suitable for various technological applications such as passive radiative cooling [16], gas sensors [17,18], optical information storage [19], high-efficiency photoconductors, thermoelectric, and piezoelectric devices [20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Tellurium microtubes synthesized by thermal evaporation method

Siciliano

Filippo

Genga

et al. 2011

Cryst. Res. Technol.

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Te microtubes with hexagonal cross sections were deposited on quartz substrates by thermal evaporation method of Te metal in an inert atmosphere without the presence of any catalyst. Tellurium was evaporated by heating at 600 °C and the Te gas was condensed on quartz substrates at 280-300 °C under a flow of argon maintained at 20 sccm for different evaporation times. Scanning electron microscopy observation demonstrated that the initial products mainly consisted of sphere-like microparticles. With increasing the evaporation time these microparticles gradually evolved into complete microtubes and then into microrods. The diameters of the microtubes range from 30 to 70 µm and their lengths from 0.5 to 6 mm. Structural and chemical characterization using X-ray diffraction and energy dispersive spectrometer, show that the Te microtubes consist of only the Te element and have a single phase hexagonal structure.

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Growth of PbS microtubes with quadrate cross sections

Cited by 15 publications

References 40 publications

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

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

Transition from n- to p-type electrical conductivity induced by ethanol adsorption on α-tellurium dioxide nanowires

Tellurium microtubes synthesized by thermal evaporation method

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