Turning single bubble sonoluminescence from blue in pure water to green by adding trace amount of carbon nanodots

作者全名："Song, Dan; Xu, Wen; Luo, Man; You, Kaijun; Tang, Ju; Wen, Hua; Cheng, Xingjia; Luo, Xiaobing; Wang, Zhibiao"

作者地址："[Song, Dan; Luo, Man; You, Kaijun; Luo, Xiaobing; Wang, Zhibiao] Chongqing Med Univ, Coll Biomed Engn, Key Lab Ultrasound Med & Engn, Chongqing 400010, Peoples R China; [Song, Dan; Xu, Wen; Wen, Hua; Cheng, Xingjia] Chinese Acad Sci, Inst Solid State Phys, Key Lab Mat Phys, HFIPS, Hefei 230031, Peoples R China; [Song, Dan; Wen, Hua; Cheng, Xingjia] Univ Sci & Technol China, Hefei 230026, Peoples R China; [Xu, Wen; Tang, Ju] Yunnan Univ, Sch Phys & Astron, Kunming 650000, Yunnan, Peoples R China; [Xu, Wen] Micro Opt Instruments Inc, Shenzhen 518118, Peoples R China"

通信作者："Wang, ZB (corresponding author), Chongqing Med Univ, Coll Biomed Engn, Key Lab Ultrasound Med & Engn, Chongqing 400010, Peoples R China.; Xu, W (corresponding author), Chinese Acad Sci, Inst Solid State Phys, Key Lab Mat Phys, HFIPS, Hefei 230031, Peoples R China."

来源：ULTRASONICS SONOCHEMISTRY

ESI学科分类：CHEMISTRY

WOS号：WOS:000703600200005

JCR分区：Q1

影响因子：8.4

年份：2021

卷号：78

期号：　

开始页：　

结束页：　

文献类型：Article

关键词：Carbon nanodots; Sonoluminescence; Free radical; Blackbody radiation; Characteristic emission

摘要："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 center dot) 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 center dot 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."

基金机构："National Natural Science foundation of ChinaNational Natural Science Foundation of China (NSFC) [81127901, U206720039, U193010069]; Shenzhen Science and Technology Program [KQTD20190929173954826]"

基金资助正文："This work was supported by the National Natural Science foundation of China (81127901, U206720039, U193010069) and by Shenzhen Science and Technology Program (KQTD20190929173954826) ."