Catledge Shane A, Singh Sonal
Center for Nanoscale Materials and Biointegration (CNMB), University of Alabama at Birmingham, Department of Physics, Birmingham, Alabama 35294-1170, USA.
Adv Sci Lett. 2011 Feb 1;4(2):512-515. doi: 10.1166/asl.2011.1264.
Discrete nanodiamond particles of 500 nm and 6 nm average size were seeded onto silicon substrates and plasma treated using chemical vapor deposition to create silicon-vacancy color centers. The resulting narrow-band room temperature photoluminescence is intense, and readily observed even for weakly agglomerated sub-10 nm size diamond. This is in contrast to the well-studied nitrogen-vacancy center in diamond which has luminescence properties that are strongly dependant on particle size, with low probability for incorporation of centers in sub-10 nm crystals. We suggest the silicon-vacancy center to be a viable alternative to nitrogen-vacancy defects for use as a biomarker in the clinically-relevant sub-10 nm size regime, for which nitrogen defect-related luminescent activity and stability is reportedly poor.
将平均尺寸为500纳米和6纳米的离散纳米金刚石颗粒接种到硅衬底上，并使用化学气相沉积进行等离子体处理，以创建硅空位色心。由此产生的窄带室温光致发光很强，即使对于弱团聚的亚10纳米尺寸的金刚石也很容易观察到。这与金刚石中经过充分研究的氮空位中心形成对比，氮空位中心的发光特性强烈依赖于颗粒尺寸，在亚10纳米晶体中形成中心的概率较低。我们认为，对于临床相关的亚10纳米尺寸范围用作生物标志物而言，硅空位中心是氮空位缺陷的可行替代方案，据报道，氮缺陷相关的发光活性和稳定性较差。
