TY - JOUR
T1 - The synthesis and electrical transport properties of carbon/Cr2GaC MAX phase composite microwires
AU - Siebert, Jan P.
AU - Hajra, Debarati
AU - Tongay, Sefaattin
AU - Birkel, Christina S.
N1 - Funding Information:
The authors acknowledge the use of facilities within the Eyring Materials Center at Arizona State University. S. T. acknowledges support from DOE-SC0020653, Applied Materials Inc., NSF CMMI 1825594, NSF CMMI 1933214, NSF CMMI 2129412 and NSF DMR 2111812.
Publisher Copyright:
© The Royal Society of Chemistry.
PY - 2022/1/21
Y1 - 2022/1/21
N2 - 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.
AB - 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.
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U2 - 10.1039/d1nr06780j
DO - 10.1039/d1nr06780j
M3 - Article
C2 - 34940774
AN - SCOPUS:85123592308
SN - 2040-3364
VL - 14
SP - 744
EP - 751
JO - Nanoscale
JF - Nanoscale
IS - 3
ER -