Perikala Manasa, Bhardwaj Asha
Department of Instrumentation and Applied Physics, Indian Institute of Science, Bangalore 560012, India.
ACS Omega. 2019 Dec 4;4(25):21223-21229. doi: 10.1021/acsomega.9b02686. eCollection 2019 Dec 17.
In this article, synthesis of white-light-emitting, highly stable carbon dots (CDs) using a colloidal synthesis technique is reported. It has been observed that the use of a non-coordinating solvent plays a vital role in the successful fabrication of highly stable CDs. Dilution-independent emissive behavior in CDs is achieved. Excitation-energy-dependent emissive behavior is observed in CDs. However, by surface passivating the CD core by using hexadecylamine (HDA), excitation wavelength dependence of emission is successfully minimized. Surface-functionalized CDs (SFCDs) show blue to green light tunable emission with the change in synthesis conditions. HDA also plays an important role in achieving dilution-independent emission in SFCDs. Furthermore, the carbon dots synthesized are highly inert, and their emission spectra are unaffected on exposure to an open atmosphere for as long as 9 days. A new class of highly crystalline carbon dots called "carbon onion rings" is reported.
本文报道了采用胶体合成技术合成发光稳定的白光碳点（CDs）。据观察，使用非配位溶剂在成功制备高稳定性碳点中起着至关重要的作用。实现了碳点中与稀释无关的发光行为。在碳点中观察到了与激发能量相关的发光行为。然而，通过使用十六胺（HDA）对碳点核心进行表面钝化，成功地将发射的激发波长依赖性降至最低。表面功能化碳点（SFCDs）随着合成条件的变化呈现出从蓝光到绿光的可调发射。HDA在实现SFCDs中与稀释无关的发射方面也起着重要作用。此外，合成的碳点具有高度惰性，其发射光谱在暴露于开放大气长达9天的情况下不受影响。报道了一类新型的高度结晶的碳点，称为“碳洋葱环”。
