Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 113, Issue 37, Pages 16356-16363Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp904288n
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Funding
- Center for Nanoscience and Nanotechnology
- National Science Council, Taiwan, ROC [NSC98-2221-E110-040-MY3]
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Analytical electron microscopic observations indicated that the chromium oxide nanocondensates fabricated by pulsed laser ablation in water are predominantly dodecalledral Cr3O4 With-varied extent of tetragonal (t) distortion from the spinel (sp) type following the Bain relationship [21 (1) over bar](sp)//[01 (1) over bar](1); (011)(sp)//(100)(t). The t-Cr3O4 nanocondensates have {101} twinning due to tetragonal distortion and/or a coalescence event. The additional (3/2) x (200) and 2 x (211) commensurate superstructures can be attributed to the periodic presence of Cr2+, Cr3+, and/or H+ in the 4- and/or 6-coordinated lattice sites with an internal compressive stress up to similar to 5 GPa according to X-ray photoelectron and vibrational spectroscopic evidence. The presence of internal stress and Cr2+ ion caused red shift of the UV absorbance, thus shedding light on potential optoelectronic applications of the Cr3O4 nanocondensates.
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