Synthesis and optical characterization of CdTe nanocrystals prepared by ball milling process

Tan, Guolong

doi:10.1016/s1359-6462(03)00079-4

Cited by 49 publications

(24 citation statements)

References 19 publications

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“…Many properties of nanoparticles depend on their size and shape (Li et al, 2002; Tan et al, 2003; Zhang et al, 2010). Fiber-shaped (one-dimensional) nanoparticles exhibit different properties than round-shaped (zero-dimensional) nanospheres (Hamilton et al, 2009; Tafen et al, 2009; Wu et al, 2010; Zhi et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

Purification and sidewall functionalization of multiwalled carbon nanotubes and resulting bioactivity in two macrophage models

Hamilton

Xiang

et al. 2013

Inhalation Toxicology

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This study examined the consequences of surface carboxylation of multiwalled carbon nanotubes (MWCNT) on bioactivity. Since commercial raw MWCNT contain impurities that may affect their bioactivity, HCl refluxing was exploited to purify raw “as-received” MWCNT by removing the amorphous carbon layer on the MWCNT surface and reducing the metal impurities (e.g. Ni). The removal of amorphous carbon layer was confirmed by Raman spectroscopy and thermogravimetric analysis. Furthermore, the HCl-purified MWCNT provided more available reaction sites, leading to enhanced sidewall functionalization. The sidewall of HCl-purified MWCNT was further functionalized with the −COOH moiety by HNO3 oxidation. This process resulted in four distinct MWCNT: raw, purified, −COOH-terminated raw MWCNT, and −COOH-terminated purified MWCNT. Freshly isolated alveolar macrophages from C57Bl/6 mice were exposed to these nanomaterials to determine the effects of the surface chemistry on the bioactivity in terms of cell viability and inflammasome activation. Inflammasome activation was confirmed using inhibitors of cathepsin B and Caspase-1. Purification reduced the cell toxicity and inflammasome activation slightly compared to raw MWCNT. In contrast, functionalization of MWCNT with the −COOH group dramatically reduced the cytotoxicity and inflammasome activation. Similar results were seen using THP-1 cells supporting their potential use for high-throughput screening. This study demonstrated that the toxicity and bioactivity of MWCNT were diminished by removal of the Ni contamination and/or addition of −COOH groups to the sidewalls.

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Section: Introductionmentioning

confidence: 99%

Purification and sidewall functionalization of multiwalled carbon nanotubes and resulting bioactivity in two macrophage models

Hamilton

Xiang

et al. 2013

Inhalation Toxicology

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“…Structural evolution or phase transition have also been observed in these mono-dispersive CdSe nanocrystals upon critical static pressures [35,36], the wurtzite CdSe nanocrystals performed similar phase transition to rock salt structure like bulk crystal. Recently, mechanical alloying (MA) process has been applied to synthesize CdTe nanocrystals [37][38][39] and many other types of nanocrystals [40,41]. Non-hydrostatic pressure induced phase transformation has also been observed in the alloyed compounds during ball milling process [42].…”

Section: Introductionmentioning

confidence: 99%

“…MA method provides a good pathway to produce surface clean semiconductor nanocrystals, which could be used to study the intrinsic valence electronic structure and optical excitation behavior of quantum dots. Surface clean samples may be able to exclude the influence of capping organic ligand on the physical properties of the semiconductor nanocrystals [37,39]. This is a safe, low cost and easy way to fabricate semiconductor nanocrystals, and can be easily extended to mass production.…”

Section: Introductionmentioning

confidence: 99%

Structural evolution and optical properties of CdSe nanocrystals prepared by mechanical alloying

Tan

Zhang

2009

Journal of Alloys and Compounds

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“…This last form of CdTe can also be obtained by the pressure cycle method [9]. In a recent paper, CdTe nanocrystals have been successfully synthesized by mechanical alloying (MA) process [10], starting from high purity elemental powders (99.99% cadmium and 99.999% tellurium). A high energy SPEX 8000D Mix/miller and a high ball-to-powder mass ratio (20:1) were used for milling times as longer as 50 h, when the particle size ranged from 2 to 6 nm.…”

Section: Introductionmentioning

confidence: 99%

Influence of minor oxidation of the precursor powders to form nanocrystalline CdTe by mechanical alloying

Campos¹,

Ersching²,

Lima³

et al. 2008

Journal of Alloys and Compounds

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Synthesis and optical characterization of CdTe nanocrystals prepared by ball milling process

Cited by 49 publications

References 19 publications

Purification and sidewall functionalization of multiwalled carbon nanotubes and resulting bioactivity in two macrophage models

Purification and sidewall functionalization of multiwalled carbon nanotubes and resulting bioactivity in two macrophage models

Structural evolution and optical properties of CdSe nanocrystals prepared by mechanical alloying

Influence of minor oxidation of the precursor powders to form nanocrystalline CdTe by mechanical alloying

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