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Modulation of the Electronic Properties of MXene (Ti3C2Tx) via Surface-Covalent Functionalization with Diazonium
ACS Nano ( IF 15.8 ) Pub Date : 2021-01-05 , DOI: 10.1021/acsnano.0c08664 Hongyue Jing 1 , Hyeonwoo Yeo 2 , Benzheng Lyu 1 , Junga Ryou 2 , Seunghyuk Choi 1 , Jin-Hong Park 1 , Byoung Hun Lee 3 , Yong-Hoon Kim 2 , Sungjoo Lee 1, 4
ACS Nano ( IF 15.8 ) Pub Date : 2021-01-05 , DOI: 10.1021/acsnano.0c08664 Hongyue Jing 1 , Hyeonwoo Yeo 2 , Benzheng Lyu 1 , Junga Ryou 2 , Seunghyuk Choi 1 , Jin-Hong Park 1 , Byoung Hun Lee 3 , Yong-Hoon Kim 2 , Sungjoo Lee 1, 4
Affiliation
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The physical and chemical properties of MXenes are strongly dependent on surface terminations; thus, the tailoring of surface functional groups in two-dimensional transition-metal carbides (MXenes) may extend the applicability of these compelling materials to a wider set of fields. In this work, we demonstrate the chemical modification of Ti3C2Tx MXene via diazonium covalent chemistry and the subsequent effects on the electrical properties of MXene. The 4-nitrophenyl group was grafted onto the surface of MXene through a solid–liquid reaction, which was confirmed by various characterization methods, including X-ray photoelectron spectroscopy, Fourier transform infrared spectroscopy, electron energy loss spectroscopy, atomic force microscopy, and transmission electron microscopy. The degree of modification of MXene is expediently tunable by adjusting the concentration of the diazonium salt solution. The work function of functionalized MXene is modifiable by regulating the quantity of grafted diazonium surface groups, with an adjustable range of around 0.6 eV. Further, in this study, the electrical properties of modified MXene are investigated through the fabrication of field-effect-transistor devices that utilize modified MXene as a channel material. It was demonstrated that with increasing concentration of 4-nitrophenyl groups grafted onto the surface the on/off current ratio of the modified MXene was improved to as much as 3.56, with a corresponding decrease in conductivity and mobility. The proposed approach of controlled modification of surface groups in Ti3C2Tx may imbue Ti3C2Tx with favorable electronic behaviors and demonstrate prospects for use in electronic field applications.
中文翻译：
通过重氮表面共价官能化对MXene（Ti 3 C 2 T x）的电子性质的调控
MXenes的物理和化学性质在很大程度上取决于表面终止；因此，二维过渡金属碳化物（MXenes）中表面官能团的定制可以将这些引人注目的材料的适用性扩展到更广泛的领域。在这项工作中，我们证明了Ti 3 C 2 T x MXene的化学修饰通过重氮共价化学及其对MXene电性能的影响。通过固液反应将4-硝基苯基基团接枝到MXene的表面，并通过各种表征方法得到了证实，包括X射线光电子能谱，傅立叶变换红外光谱，电子能量损失谱，原子力显微镜和透射电子显微镜。通过调节重氮盐溶液的浓度，可以方便地调节MXene的改性程度。可通过调节接枝重氮表面基团的数量来修饰官能化的MXene的功函数，其可调范围约为0.6 eV。此外，在这项研究中 通过制造利用修饰的MXene作为沟道材料的场效应晶体管器件，研究了修饰的MXene的电性能。结果表明，随着接枝到表面上的4-硝基苯基基团浓度的增加，改性MXene的开/关电流比提高到3.56，导电率和迁移率相应降低。钛表面基团受控修饰的拟议方法3 C 2 T x可以使Ti 3 C 2 T x具有良好的电子行为，并显示出在电子领域应用的前景。
更新日期：2021-01-26
中文翻译：
通过重氮表面共价官能化对MXene（Ti 3 C 2 T x）的电子性质的调控
MXenes的物理和化学性质在很大程度上取决于表面终止；因此，二维过渡金属碳化物（MXenes）中表面官能团的定制可以将这些引人注目的材料的适用性扩展到更广泛的领域。在这项工作中，我们证明了Ti 3 C 2 T x MXene的化学修饰通过重氮共价化学及其对MXene电性能的影响。通过固液反应将4-硝基苯基基团接枝到MXene的表面，并通过各种表征方法得到了证实，包括X射线光电子能谱，傅立叶变换红外光谱，电子能量损失谱，原子力显微镜和透射电子显微镜。通过调节重氮盐溶液的浓度，可以方便地调节MXene的改性程度。可通过调节接枝重氮表面基团的数量来修饰官能化的MXene的功函数，其可调范围约为0.6 eV。此外，在这项研究中 通过制造利用修饰的MXene作为沟道材料的场效应晶体管器件，研究了修饰的MXene的电性能。结果表明，随着接枝到表面上的4-硝基苯基基团浓度的增加，改性MXene的开/关电流比提高到3.56，导电率和迁移率相应降低。钛表面基团受控修饰的拟议方法3 C 2 T x可以使Ti 3 C 2 T x具有良好的电子行为，并显示出在电子领域应用的前景。
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