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首页> 外文期刊>Journal of Physics, D. Applied Physics: A Europhysics Journal >Effects of annealing atmosphere on ZnO~- ions-implanted silica glass: Synthesis of Zn and ZnO nanoparticles
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Effects of annealing atmosphere on ZnO~- ions-implanted silica glass: Synthesis of Zn and ZnO nanoparticles

机译：退火气氛对注入ZnO〜-离子的石英玻璃的影响：Zn和ZnO纳米粒子的合成

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The effects of annealing atmosphere (argon or oxygen) on Zn nanoparticles (NPs), embedded in silica glass, synthesized by implanting 50 keV ZnO ~- ions to a fluence of 7 × 10~(16) cm~(-2) have been studied. Optical absorption (OA) measurements carried out on the as-implanted samples have been found to result in a surface plasmon resonance (SPR) band centred at ～255 nm due to the presence of Zn NPs in the silica glass. An increase in SPR peak intensity with a corresponding reduction of its full width at half maximum have been seen in the OA spectrum taken from the as-implanted sample following annealing in Ar ambient at 700 °C for 2h, indicating a growth in the size of Zn NPs. However, annealing the as-implanted sample in O2 gas at 700 °C for 2 h has been found to result in a steep absorption edge at ～364 nm in the OA spectrum which indicates the formation of ZnO NPs. These ZnO NPs show quantum confinement effects due to their small sizes. No observable photoluminescence (PL) emission has been seen from Zn NPs, whereas an excitonic band at ～368 nm and three deep-level PL emission bands at ～453 nm, ～521 nm and ～650nm, respectively, have been seen from ZnO NPs. It was argued that the deep-level PLs were due to the singly ionized oxygen vacancies located at ZnO NPs' surfaces. These observations suggest that ZnO NPs were formed due to oxidation of Zn NPs via interaction with the indiffusing O_2 molecules during annealing in O_2 ambient, but not with the interaction of the implanted oxygen in silica glass.
机译：退火气氛（氩气或氧气）对嵌入到石英玻璃中的Zn纳米颗粒（NPs）的影响是通过注入50 keV ZnO〜-离子至通量为7×10〜（16）cm〜（-2）合成的。研究。由于在石英玻璃中存在Zn NPs，已发现对植入样品进行的光吸收（OA）测量会导致以〜255 nm为中心的表面等离振子共振（SPR）带。在700°C的Ar环境中退火2h后，从植入后的样品中获得的OA光谱中发现SPR峰强度增加，且其半峰全宽相应减小。锌纳米颗粒。然而，已经发现在氧气中在700°C下退火2 h后，在OA光谱中〜364 nm处出现陡峭的吸收边，这表明形成了ZnO NPs。这些ZnO NP由于尺寸小，表现出量子限制效应。 Zn NPs未见可观察到的光致发光（PL）发射，而ZnO NPs分别见于〜368 nm的激子能带和〜453 nm，〜521 nm和〜650nm的三个深能级PL发射带。 。有人认为，深层PL是由于位于ZnO NPs表面的单个离子化氧空位所致。这些观察结果表明，ZnO NPs的形成是由于Zn NPs的氧化，是通过在O_2环境中退火期间与扩散的O_2分子相互作用而形成的，而不是由于石英玻璃中注入的氧的相互作用而形成的。

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