类普鲁士蓝纳米晶的长程电子输运
Long-Range Electron Transport in Prussian Blue Analog Nanocrystals
摘要：
我们报告电子输运测量通过纳米尺度的设备组成的1至3普鲁士蓝类似物（PBA）纳米晶体连接在两个电极之间。我们比较了两种类型的立方纳米晶体，CsCoFe（15 nm）和CsNiCr（6 nm），沉积在高度取向的热解石墨和导电AFM接触。测得的电流与PBA纳米器件的长度（最多45 nm）呈指数依赖关系，CsCoFe和CsNiCr纳米晶体的衰减因子\b{eta}分别在0.11 - 0.18 nm-1和0.25 - 0.34 nm-1范围内。从理论分析的电流-电压曲线的纳米尺度的设备由一个单一的纳米粒子，我们推断，电子输运介导的局部d带在0.5 eV左右的电极费米能量在两种情况下。通过与先前报道的从头计算结果的比较，我们初步确定所涉及的轨道为填充Fe（II）-t2 g d带（HOMO）的CsCoFe和半填充Ni（II）-eg d带（SOMO）的CsNiCr。对于多纳米颗粒纳米级器件（电极之间的2个和3个纳米晶体）测量的电导值与相邻PBA之间的非共振状态中的多步相干隧穿一致，简单模型给出了由静电相互作用介导的相邻PBA纳米晶体之间的强耦合（约0.1 - 0.25 eV）。
英文摘要：
We report electron transport measurements through nano-scale devices consisting of 1 to 3 Prussian blue analog (PBA) nanocrystals connected between two electrodes. We compare two types of cubic nanocrystals, CsCoFe (15 nm) and CsNiCr (6 nm), deposited on highly oriented pyrolytic graphite and contacted by conducting-AFM. The measured currents show an exponential dependence with the length of the PBA nano-device (up to 45 nm), with low decay factors \b{eta}, in the range 0.11 - 0.18 nm-1 and 0.25 - 0.34 nm-1 for the CsCoFe and the CsNiCr nanocrystals, respectively. From the theoretical analysis of the current-voltage curve for the nano-scale device made of a single nanoparticle, we deduce that the electron transport is mediated by the localized d bands at around 0.5 eV from the electrode Fermi energy in the two cases. By comparison with previously reported ab-initio calculations, we tentatively identify the involved orbitals as the filled Fe(II)-t2g d band (HOMO) for CsCoFe and the half-filled Ni(II)-eg d band (SOMO) for CsNiCr. Conductance values measured for multi-nanoparticle nano-scale devices (2 and 3 nanocrystals between the electrodes) are consistent with a multi-step coherent tunneling in the off-resonance regime between adjacent PBAs, a simple model gives a strong coupling (around 0.1 - 0.25 eV) between the adjacent PBA nanocrystals, mediated by electrostatic interactions.
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