Role of Stress in the Self-Limiting Oxidation of Copper Nanoparticles

Chen, Chunhua; Yamaguchi, Tomohiko; Sugawara, Ko Ichi; Koga, Kenji

doi:10.1021/jp0546498

Cited by 58 publications

(38 citation statements)

References 24 publications

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“…3d) present a calculated value as high as 84.0 m 2 g −1 , our value is still comparably higher. The ∼45% specific surface area decrease caused by the contact between nanoparticles were generally found as our previous results [22].…”

Section: Methodssupporting

confidence: 87%

Structural and Optical Properties of Novel In2O3 Nanoparticle-Assembled Nanorods

2010

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In 2 O 3 nanoparticle-assembled nanorods with distinct surface morphologies have been newly synthesized by a dehydration process of self-assembled In(OH) 3 nanorods obtained from a liquid-based route. The reaction mechanism and the structural transformation between these two onedimensional nanorods, In 2 O 3 and In(OH) 3 , were precisely characterized by means of various qualitative and quantitative analyses with X-ray scattering simulations. The broad absorption band in the UV-visible spectrum evidently originates from the nanoparticle-assembling effect within the In 2 O 3 nanorods. An intensive photoluminescence emission at 440 nm observed under an excitation wavelength of 325 nm is attributed to the existence of oxygen vacancies within the In 2 O 3 nanorods.

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Section: Methodssupporting

confidence: 87%

Structural and Optical Properties of Novel In2O3 Nanoparticle-Assembled Nanorods

2010

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“…The quick dissolution of copper NPs could be caused, in part, by oxidation that has already occurred on the surface of the particles via brief exposures to room air when taking out samples from the storage bottle for use, though the bottle is always flushed and refilled with argon for storage. Chen et al (2005) suggested that surface oxidation of copper NPs (~14 nm average size) was a self-limiting process at 298 K (25 °C) and that the outer oxidation layer (Cu 2 O) did not progress further after reaching a maximum thickness of about 2.3 nm (Chen et al, 2005). Nevertheless, it is advisable to aliquot a new type of NP for proper storage when its chemical stability is still in question.…”

Section: Discussionmentioning

confidence: 99%

Validation of an LDH assay for assessing nanoparticle toxicity

et al. 2011

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Studies showed that certain cytotoxicity assays were not suitable for assessing nanoparticle (NP) toxicity. We evaluated a lactate dehydrogenase (LDH) assay for assessing copper (Cu-40, 40 nm), silver (Ag-35, 35 nm; Ag-40, 40 nm), and titanium dioxide (TiO2-25, 25 nm) NPs by examining their potential to inactivate LDH and interference with β-nicotinamide adenine dinucleotide (NADH), a substrate for the assay. We also performed a dissolution assay for some of the NPs. We found that the copper NPs, because of their high dissolution rate, could interfere with the LDH assay by inactivating LDH. Ag-35 could also inactivate LDH probably because of the carbon matrix used to cage the particles during synthesis. TiO2-25 NPs were found to adsorb LDH molecules. In conclusion, NP interference with the LDH assay depends on the type of NPs and the suitability of the assay for assessing NP toxicity should be examined case by case.

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“…It can be seen that the nanopowder stored in a sealed vessel did not show any oxide peak. On the other hand, nanopowder exposed to air shows a peak which correspond to 1 1 1 face of Cu 2 O [32,33,34]. It may be noted that even in air exposed powder, only a small portion get oxidized.…”

Section: Oxidation Resistance Of Copper Nanopowdermentioning

confidence: 96%