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Luminescence switching in polymerically confined carbon nanoparticles triggered by UV-light
Nanoscale ( IF 5.8 ) Pub Date : 2021-09-01 , DOI: 10.1039/d1nr02786g Indrajit Srivastava 1, 2 , Parikshit Moitra 3 , Dinabandhu Sar 1, 2 , Kevin Wang 1, 2 , Maha Alafeef 1, 2, 3, 4, 5 , John Scott 6 , Dipanjan Pan 1, 2, 3, 4, 6
Nanoscale ( IF 5.8 ) Pub Date : 2021-09-01 , DOI: 10.1039/d1nr02786g Indrajit Srivastava 1, 2 , Parikshit Moitra 3 , Dinabandhu Sar 1, 2 , Kevin Wang 1, 2 , Maha Alafeef 1, 2, 3, 4, 5 , John Scott 6 , Dipanjan Pan 1, 2, 3, 4, 6
Affiliation
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Photo-caged carbon nanoparticles (CNPs) that are non-luminescent under typical microscopic illumination but can be activated by UV light have been synthesized in this work. Negatively charged “bare” CNPs with high luminescence can lose their photoluminescence (PL) when they are chemically crosslinked to a monomer and subsequently polymerized to form an intra-particulate “caged” network at the nanoscale surface. These caged particles could regain their PL emission upon UV irradiation for a sustained period (∼24 h) resulting in the photolytic cleavage of the polymer network, thus, freeing the nanoscale surface of CNPs, ultimately resulting in six-fold emission enhancement. This reversible “on–off–on” PL switching process was verified by spectroscopic techniques. We successfully demonstrated in this work that CNPs can be switched reversibly between fluorescent and non-fluorescent states by irradiation with light. These results further substantiate that the origin of PL in CNPs is a surface phenomenon and highly dependent on their nanoscale coverage.
中文翻译：
由紫外光触发的聚合限制的碳纳米粒子中的发光转换
在这项工作中已经合成了在典型的微观照明下不发光但可以被紫外线激活的光笼碳纳米粒子 (CNPs)。当带负电荷的“裸”CNP 与单体化学交联并随后聚合以在纳米级表面形成颗粒内“笼状”网络时，它们会失去光致发光 (PL)。这些笼状颗粒可以在紫外线照射持续一段时间（~24 小时）后重新获得其 PL 发射，导致聚合物网络的光解裂解，从而释放 CNP 的纳米级表面，最终导致六倍的发射增强。这种可逆的“开-关-开”PL 切换过程已通过光谱技术得到验证。我们在这项工作中成功证明了 CNP 可以通过光照射在荧光和非荧光状态之间可逆地切换。这些结果进一步证实了 CNP 中 PL 的起源是一种表面现象，并且高度依赖于它们的纳米级覆盖。
更新日期：2021-09-24
中文翻译：
由紫外光触发的聚合限制的碳纳米粒子中的发光转换
在这项工作中已经合成了在典型的微观照明下不发光但可以被紫外线激活的光笼碳纳米粒子 (CNPs)。当带负电荷的“裸”CNP 与单体化学交联并随后聚合以在纳米级表面形成颗粒内“笼状”网络时，它们会失去光致发光 (PL)。这些笼状颗粒可以在紫外线照射持续一段时间（~24 小时）后重新获得其 PL 发射，导致聚合物网络的光解裂解，从而释放 CNP 的纳米级表面，最终导致六倍的发射增强。这种可逆的“开-关-开”PL 切换过程已通过光谱技术得到验证。我们在这项工作中成功证明了 CNP 可以通过光照射在荧光和非荧光状态之间可逆地切换。这些结果进一步证实了 CNP 中 PL 的起源是一种表面现象，并且高度依赖于它们的纳米级覆盖。
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