Antioxidants Unlock Shelf-Stable Ti3C2T  (MXene) Nanosheet Dispersions

Zhao, Xiaofei; Vashisth, Aniruddh; Prehn, Evan; Sun, Wenjuan; Shah, Smit A.; Habib, Touseef; Chen, Yexiao; Tan, Zeyi; Lutkenhaus, Jodie L.; Radović, Miladin; Green, Micah J.

doi:10.1016/j.matt.2019.05.020

Cited by 539 publications

(415 citation statements)

References 38 publications

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“…The response remained at around −9.2% over a month period, indicating a good long-term stability of the Ti 3 C 2 T x /WSe 2 sensor. This suggests that our hybridization process might also be an effective strategy to overcome the oxidation of MXenes 37,45 . Fig.…”

Section: Chemical Composition Of Ti 3 C 2 T X /Wse 2 Nanohybrids Figmentioning

confidence: 94%

Nanohybrids of a MXene and transition metal dichalcogenide for selective detection of volatile organic compounds

et al. 2020

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Two-dimensional transition metal carbides/nitrides, known as MXenes, have been recently receiving attention for gas sensing. However, studies on hybridization of MXenes and 2D transition metal dichalcogenides as gas-sensing materials are relatively rare at this time. Herein, Ti 3 C 2 T x and WSe 2 are selected as model materials for hybridization and implemented toward detection of various volatile organic compounds. The Ti 3 C 2 T x /WSe 2 hybrid sensor exhibits low noise level, ultrafast response/recovery times, and good flexibility for various volatile organic compounds. The sensitivity of the hybrid sensor to ethanol is improved by over 12-fold in comparison with pristine Ti 3 C 2 T x. Moreover, the hybridization process provides an effective strategy against MXene oxidation by restricting the interaction of water molecules from the edges of Ti 3 C 2 T x. An enhancement mechanism for Ti 3 C 2 T x /WSe 2 heterostructured materials is proposed for highly sensitive and selective detection of oxygencontaining volatile organic compounds. The scientific findings of this work could guide future exploration of next-generation field-deployable sensors.

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Section: Chemical Composition Of Ti 3 C 2 T X /Wse 2 Nanohybrids Figmentioning

confidence: 94%

Nanohybrids of a MXene and transition metal dichalcogenide for selective detection of volatile organic compounds

et al. 2020

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“…This might also be attributed to the existence of intercalants (DMSO) between Ti 3 C 2 T x nanosheets and lack of a resulted densified structure as what was featured in pristine films. It is worth mentioning that addition of polyanionic salts or reductants also protects Ti 3 C 2 T x nanosheets from oxidation, but these protocols could not make a Ti 3 C 2 T x film with both high strength and conductivity. Besides, proton acid processing method can be applied to any concentration of Ti 3 C 2 T x dispersion for the fabrication of pristine Ti 3 C 2 T x assemblies.…”

Section: Materials Performance and Applications Of Original/pristine mentioning

confidence: 99%

Pristine Titanium Carbide MXene Films with Environmentally Stable Conductivity and Superior Mechanical Strength

Chen

Wen

et al. 2019

Adv Funct Materials

184

177

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2D titanium carbide (Ti 3 C 2 T x MXene) has potential application in flexible/ transparent conductors because of its metallic conductivity and solution processability. However, solution-processed Ti 3 C 2 T x films suffer from poor hydration stability and mechanical performance that stem from the presence of intercalants, which are unavoidably introduced during the preparation of Ti 3 C 2 T x suspension. A proton acid colloidal processing approach is developed to remove the extrinsic intercalants in Ti 3 C 2 T x film materials, producing pristine Ti 3 C 2 T x films with significantly enhanced conductivity, mechanical strength, and environmental stability. Typically, pristine Ti 3 C 2 T x films show more than twofold higher conductivity (10 400 S cm −1 vs 4620 S cm −1 ) and up to 11-and 32-times higher strength and strain energy at failure (112 MPa, 1,480 kJ m −3 , vs 10 MPa, 45 kJ m −3 ) than films prepared without proton acid processing. Simultaneously, the conductivity and mechanical integrity of pristine films are also largely retained during the long-term storage in H 2 O/O 2 environment. The improvement in mechanical performance and conductivity is originated from the intrinsic strong interaction between Ti 3 C 2 T x layers, and the absence of extrinsic intercalants makes pristine Ti 3 C 2 T x films stable in humidity by blocking the intercalation of H 2 O/O 2 . This method makes the material more competitive for real-world applications such as electromagnetic interference shielding.

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“…These results are noteworthy for two reasons:F irst is their practical importance.Second, they provide,for the first time,direct evidence for anion adsorption at the edges of aTi 3 C 2 T z flake.This work complements our prior work, where we concluded that the edges of Ti 3 C 2 T z sheets were positively charged. [23] Quite recently,Zhao et al [36] showed that oxidation can be mitigated by adding sodium ascorbate and related salts,t o Ti 3 C 2 T z colloids.F urther,b yu sing molecular dynamic simulations they demonstrated that the ascorbate anions absorb at the edges,t hough this was not confirmed experimentally.I n their work, the authors held their colloidal suspensions for 3weeks in closed containers as opposed to am onth in open containers herein.…”

Section: Angewandte Chemiementioning

confidence: 99%

Edge Capping of 2D‐MXene Sheets with Polyanionic Salts To Mitigate Oxidation in Aqueous Colloidal Suspensions

et al. 2019

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MXenes have shown promise in myriad applications,s uch as energy storage,c atalysis,E MI shielding,a mong many others.However,MXene oxidation in aqueous colloidal suspensions when stored in water at ambient conditions remains ac hallenge.I ti sn ow shown that by simply capping the edges of individual MXene flakes,T i 3 C 2 T z and V 2 CT z ,b y polyanions such as polyphosphates,p olysilicates or polyborates,itispossible to quite significantly reduce their propensity for oxidation even when held in aerated water for weeks.This breakthrough resulted from the realization that the edges of MXene sheets are positively charged. It is thus an example of selectively functionalizing the edges differently from the MXene sheet surfaces.

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Antioxidants Unlock Shelf-Stable Ti3C2T (MXene) Nanosheet Dispersions

Cited by 539 publications

References 38 publications

Nanohybrids of a MXene and transition metal dichalcogenide for selective detection of volatile organic compounds

Nanohybrids of a MXene and transition metal dichalcogenide for selective detection of volatile organic compounds

Pristine Titanium Carbide MXene Films with Environmentally Stable Conductivity and Superior Mechanical Strength

Edge Capping of 2D‐MXene Sheets with Polyanionic Salts To Mitigate Oxidation in Aqueous Colloidal Suspensions

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