论文标题
胺官能化钻石表面的单氮 - 胶囊-NMR
Single Nitrogen-Vacancy-NMR of Amine-Functionalized Diamond Surfaces
论文作者
论文摘要
钻石中的核磁共振（NMR）成像，在纳米级为敏感和局部化学表征提供了令人兴奋的途径。使用合适的化学表面终止，在近地面NV中心遭受的相干时间和稳定性中，已经取得了显着的进展。但是，还需要对吸附的分子密度，方向和结合构型进行强大控制的方法。我们展示了用于混合氮和氧终止的钻石表面制备，同时改善了<10 nm深度发射器的NV中心相干时间，并通过胺反应性交叉链接实现了直接和可回收的化学功能化。使用这种方法，我们探测嵌入纳米氏波导中的单个NV中心，以执行$^{19} \ mathrm {f} $ nmr感测的共价绑定三氟甲基标签。 50-100分子体制。这项工作意味着在单分子水平上朝着核自旋定位和结构审查迈出的重要一步。
Nuclear magnetic resonance (NMR) imaging with shallow nitrogen-vacancy (NV) centers in diamond offers an exciting route toward sensitive and localized chemical characterization at the nanoscale. Remarkable progress has been made to combat the degradation in coherence time and stability suffered by near-surface NV centers using suitable chemical surface termination. However, approaches that also enable robust control over adsorbed molecule density, orientation, and binding configuration are needed. We demonstrate a diamond surface preparation for mixed nitrogen- and oxygen-termination that simultaneously improves NV center coherence times for emitters <10-nm-deep and enables direct and recyclable chemical functionalization via amine-reactive crosslinking. Using this approach, we probe single NV centers embedded in nanopillar waveguides to perform $^{19}\mathrm{F}$ NMR sensing of covalently bound trifluoromethyl tags in the ca. 50-100 molecule regime. This work signifies an important step toward nuclear spin localization and structure interrogation at the single-molecule level.
