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Negative-charge-functionalized carbon nanodot: a low-cost smart cold emitter

机译：负电荷官能化碳纳多特：低成本的智能冷发射器

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摘要

Cold emission properties of carbon nanodots (CNDs) evaluated using ANSYS Maxwell software are predicted to be size-dependent and then verified experimentally. In order to correlate the electron emission properties with the size of CNDs, the work function values were determined using ultraviolet photoelectron spectroscopy. This is the first report on theoretical calculations based on density functional theory and experimental results that confirm the work function dependency on the charge state of the functional group attached on the particle surface. The smallest CND (2.5 nm) has the highest percentage of negatively charged groups as well as the lowest work function (5.18 eV). The smallest dimension with the lowest work function assures that this sample is the best suited for field emission. It shows excellent field emission properties with a high current density of similar to 1.45 mA cm(-2) at 2 V mu m(-1) electric field, turn-on field as low as 0.04 V mu m(-1), very high field enhancement factor of 2.7 x 10(5) and high stability. Overall, the zero-dimensional CNDs showed superior field emission activity as compared to the higher dimensional carbon nanomaterials.
机译：使用ANSYS Maxwell软件评估的碳纳多特（CNDS）的冷排放性能预测是依赖于尺寸的，然后通过实验验证。为了将电子发射性能与CNDS的尺寸相关联，使用紫外光电子光谱法测定功函数值。这是基于密度泛函理论的理论计算的第一报告，实验结果证实了在颗粒表面上附着的官能团的电荷状态的功函数依赖性。最小的CND（2.5nm）具有最高百分比的带负电计的组，以及最低的工作功能（5.18eV）。最小工作功能的最小尺寸确保此样本最适合场发射。它显示出优异的场发射性能，具有高电流密度的高电流密度为1.45 mA cm（-2），在2 V mu m（-1）电场，开启场低至0.04 V mu m（-1），非常高场增强因子为2.7×10（5）和高稳定性。总的来说，与高尺寸碳纳米材料相比，零维CND显示出优异的场发射活性。

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