The synthesis and electrical transport properties of carbon/Cr 2 GaC MAX phase composite microwires
The synthesis and electrical transport properties of carbon/Cr 2 GaC MAX phase composite microwires
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碳/Cr 2 GaC MAX相复合微丝的合成及其电传输性能
DOI：
10.1039/d1nr06780j
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发表时间：
2022
期刊：
影响因子：
6.7
通讯作者：
Birkel, Christina S.
中科院分区：
文献类型：
--
作者：
Siebert, Jan P.;Hajra, Debarati;Tongay, Sefaattin;Birkel, Christina S.
虽然MAX相提供了陶瓷和金属特性的异国情调的组合，使它们成为一类独特的材料，但它们的应用几乎仍然是假设的。为了克服这个缺点，引入了一种基于溶胶-凝胶的路线，该路线允许在数十微米的范围内获得微丝。通过XRD、SEM、EDS和AFM的彻底结构表征证明了碳质Cr2 GaC线的成功合成，并且先进的低温电子输运测量揭示了由无定形碳主导的电阻率行为。所获得的微丝的电子行为的可调谐性通过卤化物合成后处理来显示，从而允许有目的地设计微丝的导电性。拉曼研究揭示了插层卤化物的聚阴离子性质，并从随时间变化的电导率测量得出卤化物浓度缓慢降低的结论。基于这些发现，该过程被认为是一个可行的候选制造化学电阻卤素气体传感器。
While MAX phases offer an exotic combination of ceramic and metallic properties, rendering them a unique class of materials, their applications remain virtually hypothetical. To overcome this shortcoming, a sol–gel based route is introduced that allows access to microwires in the range of tens of micrometers. Thorough structural characterization through XRD, SEM, EDS, and AFM demonstrates a successful synthesis of carbonaceous Cr2GaC wires, and advanced low temperature electronic transport measurements revealed resistivity behavior dominated by amorphous carbon. The tunability of electronic behavior of the obtained microwires is shown by a halide post-synthesis treatment, allowing purposeful engineering of the microwires’ electrical conductivity. Raman studies revealed the polyanionic nature of the intercalated halides and a slow decrease in halide concentration was concluded from time-dependent conductivity measurements. Based on these findings, the process is considered a viable candidate for fabricating chemiresistive halogen gas sensors.