DataVXACS Applied Nano MaterialsPaper
journal article·2022-11-25Open access

MXene Nanosheet/Organics Superlattice for Flexible Thermoelectrics

Zhiwen Wang, Mengran Chen, Zhining Cao, Jia Liang, Zhenguo Liu, Yuxue Xuan, Lin Pan, Kafil M. Razeeb, Yifeng Wang, Chunlei Wan, Peng-an Zong

ACS Applied Nano Materials· Volume 5· Issue 11
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Source abstract

Abstract

Two-dimensional (2D) materials with outstanding electronic transport properties are rigid against bending because of strong in-plane covalent bonding and intrinsically flexible because of the lack of out-of-plane constraint and thus are considered to be promising for flexible thermoelectrics (TEs). As a typical 2D material, MXene, however, exhibited a restricted TE performance because the termination groups and guest molecules in MXene nanosheets introduced by acid etching and reassembly deteriorate intra/interflake conduction. This work realized increases in both the carrier concentration and intra/interflake mobility by the construction of a MXene nanosheet/organic superlattice (SL) and composition engineering, attributed to electron injection, intercoupling strengthening, and defect reduction at the nanosheet edges. An electrical conductivity increased by 5 times, to 2.7 × 105 S m–1, led to power factors of up to ∼33 μW m–1 K–2, which is above the state-of-the-art for similar materials, almost by a factor of 10. A TE module comprising four SL film legs could yield 58.6 nW power at a temperature gradient of 50 K. Additionally, both the annealed film and the corresponding module exhibited excellent reproducibility and stability. Our results provide a strategy to tailor the TE performance of 2D-material films through SL construction and composition engineering.
Source: openalex_inverted_index · Quality: baseline

Research context

Nanomaterials

OpenAlex topics: MXene and MAX Phase Materials · 2D Materials and Applications · Advanced Thermoelectric Materials and Devices

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

College of Materials Science and Engineering, Nanjing Tech University, Nanjing210009, China

State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing100084, China

Key Laboratory of Flexible Electronics of Zhejiang Province, Ningbo Institute of Northwestern Polytechnical University, Ningbo315103, China

Micro-Nano Systems Centre, Tyndall National Institute, University College Cork, Dyke Parade, Lee Maltings, CorkT12 R5CP, Ireland

Funding

H2020 LEIT Information and Communication Technologies · Science Foundation Ireland · European Regional Development Fund · Natural Science Foundation of Jiangsu Province · National Natural Science Foundation of China · Priority Academic Program Development of Jiangsu Higher Education Institutions · Key Research and Development Projects of Shaanxi Province · State Key Laboratory of High-Performance Ceramics and Superfine Microstructure, Shanghai Institute Of Ceramics · Natural Science Fund for Colleges and Universities in Jiangsu Province · Opening Project of State Key Laboratory of New Ceramic and Fine Processing Tsinghua University

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