Nitrogen-induced shift of photoluminescence from green to blue emission for xylose-derived carbon dots
Nitrogen-induced shift of photoluminescence from green to blue emission for xylose-derived carbon dots
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DOI：
10.1088/2632-959x/aba771
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发表时间：
2020-07
期刊：
影响因子：
3
通讯作者：
Shanshan Wang;Dong-Sheng Yang;Fuqian Yang
中科院分区：
文献类型：
--
作者：
Shanshan Wang;Dong-Sheng Yang;Fuqian Yang
碳点的发现为纳米材料在生物传感和生物成像中的应用开辟了一条新的途径。在这项工作中，我们开发了一种简单的方法来从木糖中制备碳纳米颗粒，并通过三种不同的过程相结合来调节木糖衍生的碳纳米颗粒的光致发光(PL)特性：水热碳化(HTC)、850℃热处理和在NH4OH溶液中的激光烧蚀(LA)。在365 nm的紫外光激发下，HTC合成的碳点(CDS)表现出绿光发射，热处理导致了发光特性的完全丧失，而经过LA处理的碳纳米颗粒与HTC合成的CDS相比，在相同的紫外光激发下恢复了蓝移的发光特性。HTC-CDS和LA-CDS的发光特性分别依赖于含C表面官能团的π-π*跃迁和含N表面官能团的π-π*和n-π*跃迁，这是导致高温气相合成和LA处理的CDS的发光特性不同的原因。这项工作中展示的方法为在碳纳米颗粒表面引入和调节表面官能团提供了一种可行的方法。
The discovery of carbon dots opens a new avenue to the applications of nanomaterials in biosensing and bioimaging. In this work, we develop simple methods to prepare carbon nanoparticles from xylose and to tune the photoluminescence (PL) characteristics of the xylose-derived carbon nanoparticles via the combination of three different processes: hydrothermal carbonization (HTC), annealing at 850 °C and laser ablation (LA) in a NH4OH solution. The HTC-synthesized carbon dots (CDs) exhibit green emission under the 365 nm UV excitation, the annealing of the HTC-synthesized CDs leads to complete loss of the PL characteristics, and the LA processing of the annealed carbon nanoparticles recovers the PL characteristics with blue shift in comparison to the HTC-synthesized CDs under the same UV excitation. the PL characteristics of the HTC-CDs and the LA-CDs are dependent on the π-π* transition of C-containing surface-functional groups and π-π* and n-π* transitions of N-containing surface-functional groups, respectively, which are responsible for the difference in the PL characteristics between the HTC-synthesized CDs and the LA-processed CDs. The approaches demonstrated in this work provide a viable method to introduce and tune surface-functional groups on the surface of carbon nanoparticles.