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Acoustomicrofluidic Synthesis of Pristine Ultrathin Ti3C2Tz MXene Nanosheets and Quantum Dots
RMIT Univ, Australia.
RMIT Univ, Australia.
RMIT Univ, Australia.
RMIT Univ, Australia.
Vise andre og tillknytning
2021 (engelsk)Inngår i: ACS Nano, ISSN 1936-0851, E-ISSN 1936-086X, Vol. 15, nr 7, s. 12099-12108Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

The conversion of layered transition metal carbides and/or nitrides (MXenes) into zero-dimensional structures with thicknesses and lateral dimensions of a few nanometers allows these recently discovered materials with exceptional electronic properties to exploit the additional benefits of quantum confinement, edge effects, and large surface area. Conventional methods for the conversion of MXene nanosheets and quantum dots, however, involve extreme conditions such as high temperatures and/or harsh chemicals that, among other disadvantages, lead to significant degradation of the material as a consequence of their oxidation. Herein, we show that the large surface acceleration.on the order of 10 million gs.produced by high-frequency (10 MHz) nanometer-order electromechanical vibrations on a chipscale piezoelectric substrate is capable of efficiently nebulizing, and consequently dimensionally reducing, a suspension of multilayer Ti3C2Tz (MXene) into predominantly monolayer nanosheets and quantum dots while, importantly, preserving the material from any appreciable oxidation. As an example application, we show that the high-purity MXene quantum dots produced using this room-temperature chemical-free synthesis method exhibit superior performance as electrode materials for electrochemical sensing of hydrogen peroxide compared to the highly oxidized samples obtained through conventional hydrothermal synthesis. The ability to detect concentrations as low as 5 nM is a 10-fold improvement to the best reported performance of Ti3C2Tz MXene electrochemical sensors to date.

sted, utgiver, år, opplag, sider
AMER CHEMICAL SOC , 2021. Vol. 15, nr 7, s. 12099-12108
Emneord [en]
Ti3C2Tz MXene; quantum dots; nanosheets; acoustic waves; H2O2 sensing
HSV kategori
Identifikatorer
URN: urn:nbn:se:liu:diva-178438DOI: 10.1021/acsnano.1c03428ISI: 000679406500098PubMedID: 34184875OAI: oai:DiVA.org:liu-178438DiVA, id: diva2:1587334
Merknad

Funding Agencies|Australian Research CouncilAustralian Research Council [DP180102110]; SSF Synergy Program [EM16-0004]; Knut and Alice Wallenberg (KAW) FoundationKnut & Alice Wallenberg Foundation [KAW2015.0043]; ARC DECRA FellowshipAustralian Research Council [DE200100279]; RMIT University

Tilgjengelig fra: 2021-08-24 Laget: 2021-08-24 Sist oppdatert: 2022-06-29

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