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Chromium Carbide Nanosheets Prepared by Selective Etching of Aluminum from Cr2AlC for Hydrazine Detection
ACS Applied Nano Materials ( IF 5.3 ) Pub Date : 2020-10-30 , DOI: 10.1021/acsanm.0c02230 Bhuvaneswari Soundiraraju 1, 2 , Rajeev Raghavan 1 , Benny Kattikkanal George 1
ACS Applied Nano Materials ( IF 5.3 ) Pub Date : 2020-10-30 , DOI: 10.1021/acsanm.0c02230 Bhuvaneswari Soundiraraju 1, 2 , Rajeev Raghavan 1 , Benny Kattikkanal George 1
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We report on the chemical exfoliation of bulk Cr2AlC to two-dimensional (2D) chromium carbide (Cr2C) nanosheets and its characterization and application for hydrazine sensing. MXenes are a swiftly expanding family of ultrathin 2D nanomaterials with tailorable surface chemistry. MXenes with mixed surface terminations such as oxygen, hydroxyl, and fluorine are mainly synthesized from MAX phase precursors via selective etching of “A” element using fluoride-based etchants. However, etching of Al from Cr2AlC remains challenging due to the similar reactivity of Cr and Al toward the fluoride-based etchants. Herein, a combination of ferric chloride and tartaric acid was employed as an etchant for the first time to exfoliate Cr2AlC. The difference in redox potential and metal-complex-forming ability of the etchant combination were exploited for selective removal of Al from Cr2AlC. Application of the synthesized Cr2C nanosheets with oxygen and hydroxyl surface termination is demonstrated for hydrazine sensing. The proof of concept for utilizing MXene as a receptor in a microresonator is investigated for the first time by coating the cantilever with Cr2CTx nanosheets to detect hydrazine in the ppm level.
中文翻译：
从Cr 2 AlC中选择性蚀刻铝制备肼的碳化铬纳米片。
我们报告了将大量的Cr 2 AlC剥落成二维（2D）碳化铬（Cr 2 C）纳米片的化学剥落及其在肼传感中的表征和应用。MXenes是具有可定制表面化学特性的超薄2D纳米材料的快速扩展系列。具有混合的表面末端（如氧，羟基和氟）的MXene主要是由MAX相前驱物通过使用氟化物基蚀刻剂选择性蚀刻“ A”元素而合成的。然而，由于Cr和Al对基于氟化物的蚀刻剂具有相似的反应性，因此从Cr 2 AlC蚀刻Al仍然具有挑战性。在此，氯化铁和酒石酸的组合首次用作蚀刻剂以剥离Cr 2。铝 利用腐蚀剂组合的氧化还原电势和金属络合物形成能力的差异来从Cr 2 AlC中选择性去除Al 。已证明具有氧和羟基表面终止作用的合成Cr 2 C纳米片在肼感测中的应用。通过在悬臂上涂覆Cr 2 CT x纳米片以检测ppm级的肼，首次研究了在微谐振器中利用MXene作为受体的概念证明。
更新日期：2020-11-25
中文翻译：
从Cr 2 AlC中选择性蚀刻铝制备肼的碳化铬纳米片。
我们报告了将大量的Cr 2 AlC剥落成二维（2D）碳化铬（Cr 2 C）纳米片的化学剥落及其在肼传感中的表征和应用。MXenes是具有可定制表面化学特性的超薄2D纳米材料的快速扩展系列。具有混合的表面末端（如氧，羟基和氟）的MXene主要是由MAX相前驱物通过使用氟化物基蚀刻剂选择性蚀刻“ A”元素而合成的。然而，由于Cr和Al对基于氟化物的蚀刻剂具有相似的反应性，因此从Cr 2 AlC蚀刻Al仍然具有挑战性。在此，氯化铁和酒石酸的组合首次用作蚀刻剂以剥离Cr 2。铝 利用腐蚀剂组合的氧化还原电势和金属络合物形成能力的差异来从Cr 2 AlC中选择性去除Al 。已证明具有氧和羟基表面终止作用的合成Cr 2 C纳米片在肼感测中的应用。通过在悬臂上涂覆Cr 2 CT x纳米片以检测ppm级的肼，首次研究了在微谐振器中利用MXene作为受体的概念证明。
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