State Key Laboratory of Silicon Materials, Zhejiang University, Hangzhou, Zhejiang 310027, PR China.
Nanoscale. 2012 Oct 21;4(20):6664. doi: 10.1039/c2nr31398g.
A recent paper in this journal reported the synthesis of highly fluorescent crystalline carbon nanoparticles by microwave irradiation of sucrose with phosphoric acid. The emission wavelengths reported in this investigation are always twice the corresponding excitation wavelengths and the full widths at half maximum are extremely small (15-20 nm). We suggest that their results and discussions are questionable. Detailed analysis indicates that the fluorescence may not be real fluorescence, but the second order diffraction of excitation light.
最近，本刊上的一篇论文报道了通过微波辐照蔗糖与磷酸合成高荧光结晶碳纳米粒子的方法。本研究中报道的发射波长总是对应激发波长的两倍，半峰全宽极小（15-20nm）。我们认为他们的结果和讨论值得怀疑。详细分析表明，这种荧光可能不是真正的荧光，而是激发光的二级衍射。
