► The BMH empirical potential parameters of Pu–O bond in α-Pu2O3were fitted by GULP program. ► The thermal properties of α-Pu2O3were firstly reported. ► The calculated thermal properties are in good agreement with the experimental data for PuO2. ► The BMH empirical potential parameters of PuO2can be used to evaluate other properties for PuO2.
Pages 1-6 Sheo K. Mishra, Rajneesh K. Srivastava, S.G. Prakash
Graphical abstract
Zinc acetate dihydrate, Zn(CH3COO)2·2H2O has been used as a precursor to prepare zinc oxide nanoparticles (NPs) by thermal decomposition in air at 400°C. Two samples with reaction time of 3 and 12h are studied. Structural study of ZnO NPs has been analyzed by X-ray diffraction (XRD). The synthesized ZnO NPs are found to possess wurtzite structure. The average crystallite size determined by XRD is found as 29.66 and 32.68nm corresponding to reaction time of 3 and 12h, respectively. Optical properties of the ZnO NPs have been investigated by UV–visible spectroscopy and photoluminescence (PL) spectroscopy at room temperature. Blue shift in band gap is observed due to nano size. PL spectra exhibit a UV emission peak at ∼396nm (∼3.11eV), and broad visible emission peaks including violet emission at ∼418nm (∼2.96eV), blue emission at ∼441nm (∼2.79eV), blue–green emission ∼481nm (∼2.56eV) and green emission ∼522nm (∼2.37eV). Photoconductivity properties have been investigated with several parameters such as voltage dependence of photocurrent and darkcurrent, time-resolved rise and decay of photocurrent and spectral response of photocurrent. Longer reaction time of 12h manifests in improved photosensitivity as compared to that for sample with reaction time of 3h.
Highlights
► ZnO NPs are synthesized by thermal decomposition method with zinc acetate as a precursor. ► High reaction-time results in a significant reduction in PL intensity. ► In photoconductivity properties, high reaction time manifests in improved photosensitivity. ► Spectral analysis shows better photoresponse in UV region.
11 августа, после продолжительной болезни ушел из жизни выдающийся ученый современности, крупный организатор науки и образования в России, бессменный декан - основатель Факультета Наук о Материалах МГУ, организатор крупнейшей материаловедческой школы Российской Федерации, автор замечательных научных трудов и просто великолепный человек, заведующий кафедрой неорганической химии химического факультета МГУ академик Юрий Дмитриевич Третьяков.
Информационное сообщение
о формировании на 2013 год тематики и объемов финансирования работ и проектов в рамках мероприятий федеральной целевой программы «Исследования и разработки по приоритетным направлениям развития научно-технологического комплекса России на 2007—2013 годы»
09.08.2012
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