(5ナノメートル) 3のサンプルボリュームで核磁気共振スペクトロスコーピーを用いた

T Staudacher¹, F Shi, S Pezzagna

¹3rd Physics Institute and Research Center SCoPE, University of Stuttgart, 70569 Stuttgart, Germany.

Science (New York, N.Y.)

|February 2, 2013

まとめ

研究者は,室温のナノスケールサンプルで核磁気共振 (NMR) スペクトロスコピーを達成しました. このブレークスルーは,単一の窒素空白欠陥センターを高度に敏感な磁場センサーとして利用しました.

科学分野:

物理物理学物理学とは
化学化学は化学です.
マテリアルサイエンス材料科学

背景:

核磁共振 (NMR) スペクトロスコピーは強力な分析技術です.
ナノスケールのサンプルにNMRを適用することは困難であり,通常,非常に低い温度と大きな実験的努力を要求します.
以前の方法では,非常に小さなサンプル量から信号を検出するための感度が欠けていました.

研究の目的:

環境条件下でナノスケールサンプルにNMRスペクトロスコピーを実行する可能性を実証する.
極めて少量の有機物質からNMR信号を検出するための新しい方法を開発する.

主な方法:

原子サイズの磁場センサーとしてダイヤモンドの単一の窒素空白 (NV) 欠陥センターを使用しました.
NVセンターをダイヤモンドの表面から約7ナノメートル下に埋め込みました.
分析のために,ダイヤモンドの表面に様々な液体や固体有機サンプルを配置しました.
サンプルの (5ナノメートル) ^3ヴォクセルから記録されたNMRスペクトル.

主要な成果:

環境温度での有機サンプルナノスケールボリュームからのNMR信号を成功裏に検出しました.
検出容量は,わずか10^4の核スピンを含んでいた.
この方法では,統計的に極化されたスピン10^2でしか感度を達成できませんでした.

結論:

環境条件下でのナノスケールNMRスペクトロスコピーの新しい能力を実証しました.
ダイヤモンドの窒素空白センターは,最小のスピンアンサンブルからのNMR信号を検出するための非常に敏感なセンサーとして機能します.
この技術は,ナノスケールでの材料の化学的および物理的な分析のための新しい道を開きます.

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