MXenes: focus on optical and electronic properties and corresponding applications

Wang, Yifan; Xu, Yanheng; Hu, Menglei; Han, Li; Zhu, Xi

doi:10.1515/nanoph-2019-0556

Cited by 116 publications

(69 citation statements)

References 152 publications

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“…), (ii) solid solution of at least two M elements where each M distributed randomly in M sites (e.g., (Ti,V) 2 C, (Ti,Nb) 2 C), (iii) ordered double-M element in which one transition metal fills near-surface M layers or is known as perimeter and another occupies the middle M layers (e.g., (Mo, Ti) 2 C, (Mo 2 Ti 2 C 3 , etc.)). [73][74][75] MXenes present two high symmetry routes; armchair and zigzag directions (from the MXenes topview, the x-axis is parallel to the zigzag direction, y-axis coincides with the armchair). MXenes are anisotropic if we are considering armchair and zigzag directions, and this anisotropy can be tailored through flake length modulations.…”

Section: Mxenes: Chemical Composition Structures and Propertiesmentioning

confidence: 99%

Prospects and Challenges of MXenes as Emerging Sensing Materials for Flexible and Wearable Breath‐Based Biomarker Diagnosis

Hermawan

Amrillah

Riapanitra

et al. 2021

Adv Healthcare Materials

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A fully integrated, flexible, and functional sensing device for exhaled breath analysis drastically transforms conventional medical diagnosis to non-invasive, low-cost, real-time, and personalized health care. 2D materials based on MXenes offer multiple advantages for accurately detecting various breath biomarkers compared to conventional semiconducting oxides. High surface sensitivity, large surface-to-weight ratio, room temperature detection, and easy-to-assemble structures are vital parameters for such sensing devices in which MXenes have demonstrated all these properties both experimentally and theoretically. So far, MXenes-based flexible sensor is successfully fabricated at a lab-scale and is predicted to be translated into clinical practice within the next few years. This review presents a potential application of MXenes as emerging materials for flexible and wearable sensor devices. The biomarkers from exhaled breath are described first, with emphasis on metabolic processes and diseases indicated by abnormal biomarkers. Then, biomarkers sensing performances provided by MXenes families and the enhancement strategies are discussed. The method of fabrications toward MXenes integration into various flexible substrates is summarized. Finally, the fundamental challenges and prospects, including portable integration with Internet-of-Thing (IoT) and Artificial Intelligence (AI), are addressed to realize marketization.

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Section: Mxenes: Chemical Composition Structures and Propertiesmentioning

confidence: 99%

Prospects and Challenges of MXenes as Emerging Sensing Materials for Flexible and Wearable Breath‐Based Biomarker Diagnosis

Hermawan

Amrillah

Riapanitra

et al. 2021

Adv Healthcare Materials

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show abstract

“…They can vary from metallic-like to semiconducting or insulating. 170 In general, the variation in MXene conductivity is suggested to be due to the modification of the (a) surface functional group, (b) delamination yield, (c) defect concentration, (d) lateral size and (e) d-spacing between MXene flakes. 163 Generally, when the defect concentration between the large MXenes flakes is low, high conductivity of MXenes can be achieved.…”

Section: Electrical Conductivitymentioning

confidence: 99%

A comprehensive review of MXenes as catalyst supports for the oxygen reduction reaction in fuel cells

et al. 2021

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The oxygen reduction reaction (ORR) that occurs in the cathode of fuel cells is a major issue in proton exchange membrane fuel cells (PEMFCs) due to their sluggish kinetics. Exploring suitable materials for use as cathode catalysts can be challenging because the materials should be chemically active yet must be stable in an extremely corrosive environment in fuel cells. Since the successful introduction of graphene, 2-dimensional (2D) materials have received extensive research interest regarding their use as support materials for cathode catalysts due to their large surface area for catalyst dispersion. Recently, research on 2D MXene-based catalyst supports has started to increase. Excellent electronic properties, electrical conductivity, hydrophilicity and chemical and thermal stability are the key properties of potential MXenes used as catalyst supports. Therefore, in this review, the properties and performance of 2D MXene-based catalyst supports in the ORR are comprehensively discussed. This finding provides the groundwork for the exploration of MXenes in electrocatalysis, especially in the ORR. Challenges and future research directions are also discussed in this review.

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“…To date, approximately 20 single-transition metal MXenes and 15 ordered double-transition metal MXenes have reportedly been experimentally synthesized and up to 100 different MXene compositions have been theoretically predicted to be stable [ 3 ]. The high elastic mechanical strength [ 4 ], electronic conductivity [ 5 , 6 ], chemical stability [ 7 , 8 , 9 ] and hydrophilicity [ 10 , 11 ] of MXenes have opened broad prospects for their applications in a variety of industrial and technological areas including energy storage [ 12 , 13 , 14 , 15 , 16 , 17 , 18 ], optoelectronics [ 19 , 20 ], spintronics [ 11 , 21 ], catalysis [ 22 ] and sensing [ 23 ]. Although there is significant research effort in the optical [ 24 , 25 ] and electronic [ 11 , 26 , 27 ] properties of MXenes, the magnetic properties of these materials for spintronic application are relatively unexplored [ 21 , 28 ].…”

Section: Introductionmentioning

confidence: 99%

Tuning the Magnetic Properties of Two-Dimensional MXenes by Chemical Etching

et al. 2021

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Two-dimensional materials based on transition metal carbides have been intensively studied due to their unique properties including metallic conductivity, hydrophilicity and structural diversity and have shown a great potential in several applications, for example, energy storage, sensing and optoelectronics. While MXenes based on magnetic transition elements show interesting magnetic properties, not much is known about the magnetic properties of titanium-based MXenes. Here, we measured the magnetic properties of Ti3C2Tx MXenes synthesized by different chemical etching conditions such as etching temperature and time. Our magnetic measurements were performed in a superconducting quantum interference device (SQUID) vibrating sample. These data suggest that there is a paramagnetic-antiferromagnetic (PM-AFM) phase transition and the transition temperature depends on the synthesis procedure of MXenes. Our observation indicates that the magnetic properties of these MXenes can be tuned by the extent of chemical etching, which can be beneficial for the design of MXenes-based spintronic devices.

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MXenes: focus on optical and electronic properties and corresponding applications

Cited by 116 publications

References 152 publications

Prospects and Challenges of MXenes as Emerging Sensing Materials for Flexible and Wearable Breath‐Based Biomarker Diagnosis

Prospects and Challenges of MXenes as Emerging Sensing Materials for Flexible and Wearable Breath‐Based Biomarker Diagnosis

A comprehensive review of MXenes as catalyst supports for the oxygen reduction reaction in fuel cells

Tuning the Magnetic Properties of Two-Dimensional MXenes by Chemical Etching

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