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Sensitive detection of surface- and size-dependent direct and indirect band gap transitions in ferritin

机译：敏感检测铁蛋白中与表面和大小有关的直接和间接带隙跃迁

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Ferritin is a protein nano-cage that encapsulates minerals inside an 8 nm cavity. Previous band gap measurements on the native mineral, ferrihydrite, have reported gaps as low as 1.0 eV and as high as 2.5–3.5 eV. To resolve this discrepancy we have used optical absorption spectroscopy, a well-established technique for measuring both direct and indirect band gaps. Our studies included controls on the protein nano-cage, ferritin with the native ferrihydrite mineral, and ferritin with reconstituted ferrihydrite cores of different sizes. We report measurements of an indirect band gap for native ferritin of 2:140±0:015 eV (579.7 nm), with a direct transition appearing at 3:053±0:005 eV (406.1 nm). We also see evidence of a defect-related state having a binding energy of 0:220±0:010 eV. Reconstituted ferrihydrite minerals of different sizes were also studied and showed band gap energies which increased with decreasing size due to quantum confinement effects. Molecules that interact with the surface of the mineral core also demonstrated a small influence following trends in ligand field theory, altering the native mineral’s band gap up to 0.035 eV.
机译：铁蛋白是一种蛋白质纳米笼，可将矿物质包裹在8 nm的腔体内。先前对天然矿物三水铁矿的带隙测量结果表明，其缝隙低至1.0 eV，高至2.5-3.5 eV。为了解决这种差异，我们使用了光吸收光谱法，这是一种既可以测量直接带隙又可以测量间接带隙的成熟技术。我们的研究包括蛋白质纳米笼的对照，铁蛋白与天然亚铁酸盐矿物的结合以及铁蛋白与不同尺寸的重构铁水合物核心的结合。我们报告了天然铁蛋白的间接带隙测量为2：140±0：015 eV（579.7 nm），其中直接跃迁出现在3：053±0：005 eV（406.1 nm）。我们还看到了缺陷相关状态的证据，其结合能为0：220±0：010 eV。还研究了不同尺寸的再生铁矿水合物矿物，并显示出带隙能量随着量子限制效应的增加而随着尺寸的减小而增加。随着配体场论的发展，与矿物核心表面相互作用的分子也表现出很小的影响，从而将天然矿物的带隙改变到0.035 eV。

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