Turning single bubble sonoluminescence from blue in pure water to green by adding trace amount of carbon nanodots.
Turning single bubble sonoluminescence from blue in pure water to green by adding trace amount of carbon nanodots.
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通过添加微量碳纳米点将单气泡声致发光从纯水中的蓝色变为绿色
DOI：
10.1016/j.ultsonch.2021.105727
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发表时间：
2021-10
影响因子：
8.4
通讯作者：
Wang Z
中科院分区：
文献类型：
--
作者：
Song D;Xu W;Luo M;You K;Tang J;Wen H;Cheng X;Luo X;Wang Z
碳纳米点（CND）可以作为自由基捕获剂来调节声致发光（SL）中的OH•。水中微量的CND会导致SL的颜色由蓝色变为绿色。在 SL 光谱中，可以识别类黑体辐射和特征发射。这项研究为理解SL的微观机制提供了宏观现象。声致发光（SL）是一种有趣的物理效应，可以将声能转化为光脉冲。迄今为止，SL的微观机制尚未完全清楚。众所周知，羟基自由基对水的 SL 起着重要作用。在这项工作中，我们利用碳纳米点（CND）作为自由基捕获剂来调节SL效应中的羟基自由基（OH·）。通过研究含有微量CND的CND水溶液（CNDAS）中的单气泡SL（SBSL），我们发现SBSL的颜色从水中的蓝色急剧转变为CNDAS中的绿色。从发射光谱中可以识别出两种不同的 SL 机制。一种来自类黑体辐射，另一种来自具有已识别峰值的特征发射。 CND 存在时 H2O2 产量的下降表明 OH• 与 CND 相互作用对 SL 产生调节作用。通过比较超声处理前后的CND，发现SL过程中产生的羟基自由基可以参与CND上附着的化学基团的链式氧化，形成大量的羧基。类黑体辐射的黑体温度从水中的 15,600 K 降低到 CNDAS 中的 11,300 K。此外，CNDAS 的 SL 中引入了羟基自由基的发射和两个与羧基相关的新发光中心。这些重要而有趣的发现表明，通过在水中添加微量CND，可以显着调节SBSL的效应，这可以为深入了解SL效应的微观机制提供宏观现象。
Carbon nanodots (CNDs) can serve as free radical captors to modulate OH• in sonoluminescence (SL). Trace amount of CNDs in water can lead the color of SL alters from blue to green. In SL spectra, blackbody-like radiation and characteristic emission can be identified. This study provides a macroscopic phenomenon for understanding the microscopic mechanism of SL. Sonoluminescence (SL) is an interesting physical effect which can convert acoustic energy into light pulses. Up to now, the microscopic mechanism of the SL has not yet been fully clear. It is known that hydroxyl radicals play the important role for SL from water. In this work, we take advantage of carbon nano-dots (CNDs) as free radical captors to modulate the hydroxyl radicals (OH•) in SL effect. Through studying the single bubble SL (SBSL) from CND aqueous solution (CNDAS) with trace amount of CNDs, we find that the color of SBSL is tuned dramatically from blue in water to green in CNDAS. Two different SL mechanisms can be identified from emission spectrum. One comes from blackbody-like radiation and another is attributed from the characteristic emission with identified peaks. The decrease in the yield of H2O2 in the presence of CNDs suggests the modulation effect on SL via OH• interacting with CNDs. By comparison of the CNDs before and after sonication, it is found that hydroxyl radicals generated during SL can take part in the chain-like oxidation of the chemical groups attached to the CNDs to form larger amount of carboxyl groups. The blackbody temperature of blackbody-like radiation decreases from 15,600 K in water to 11,300 K in CNDAS. Moreover, the emission from hydroxyl radicals and two new luminescent centers related to carboxyl groups are introduced in SL from CNDAS. These important and interesting findings indicate that by adding trace amount of CNDs in water, the effect of SBSL can be significantly modulated, which can provide a macroscopic phenomenon for gaining an insight into the microscopic mechanism of the SL effect.
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