Rethinking Coal: Thin Films of Solution Processed Natural Carbon Nanoparticles for Electronic Devices.
Rethinking Coal: Thin Films of Solution Processed Natural Carbon Nanoparticles for Electronic Devices.
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DOI：
10.1021/acs.nanolett.5b04735
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发表时间：
2016-04
期刊：
影响因子：
10.8
通讯作者：
Brent D. Keller;N. Ferralis;J. Grossman
中科院分区：
文献类型：
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作者：
Brent D. Keller;N. Ferralis;J. Grossman
无序碳材料，无定形的和具有长程有序的，已经用于各种应用，从导电添加剂和接触材料到晶体管和光致发光器件。在这里，我们展示了一个灵活的解决方案为基础的方法，制备薄膜与可调的电性能从悬浮液球磨煤离心。所制备的膜保留了起始煤的富碳化学性质，其电导率范围超过几个数量级，并且所得膜的热处理进一步调节电导率超过7个数量级。光学吸收测量表明光学带隙可调，范围为0至1.8 eV。通过低温电导率测量和拉曼光谱，我们表明，可变范围跳跃控制的电性能在制备和热处理的薄膜和退火增加的sp（2）的内容，本地化长度，和无序。所测量的跳跃能证明了类似于无定形碳材料和还原氧化石墨烯的电子性质。最后，利用煤基薄膜制造了焦耳加热装置，并实现了高达285 °C的温度和出色的稳定性。
Disordered carbon materials, both amorphous and with long-range order, have been used in a variety of applications, from conductive additives and contact materials to transistors and photovoltaics. Here we show a flexible solution-based method of preparing thin films with tunable electrical properties from suspensions of ball-milled coals following centrifugation. The as-prepared films retain the rich carbon chemistry of the starting coals with conductivities ranging over orders of magnitude, and thermal treatment of the resulting films further tunes the electrical conductivity in excess of 7 orders of magnitude. Optical absorption measurements demonstrate tunable optical gaps from 0 to 1.8 eV. Through low-temperature conductivity measurements and Raman spectroscopy, we demonstrate that variable range hopping controls the electrical properties in as-prepared and thermally treated films and that annealing increases the sp(2) content, localization length, and disorder. The measured hopping energies demonstrate electronic properties similar to amorphous carbon materials and reduced graphene oxide. Finally, Joule heating devices were fabricated from coal-based films, and temperatures as high as 285 °C with excellent stability were achieved.