1. Growth of Tellurium-Based 2D Materials for Electronics and Optoelectronics

Tellurium (Te) is a newly emerging semiconductor with a truly one-dimensional crystal structure. It has shown great promising in fabrication of high-performance electronic and optoelectronic devices. We started working on this direction in 2018 and have done a series of promising works in this field. Our aim is to use methods like chemical vapor depositon (CVD) and thermal evaporation to achieve the control gorwth of high-quality 2D Te nanoflakes, SeTe alloyed nanoflakes, Te thin film, SeTe thin film or their 2D van der waals heterostructures for fabrication of high-performance electronic and optoelectronic devices, including trainsistsors, logic gates, circuits, memory devices and synaptic transistors, photodetectors and imaging sensor systems. We focus on the science and technology challenges lying in optimizing their device performance by materials engineering, device structure engineering and circuit design.

Publication in This Direction:

Nano-Micro Lett., 2022, 14, 109.

Adv. Funct. Mater., 2022, 32, 2111970.

Nat. Nanotechnol., 2020, 15, 53.

Adv. Mater., 2020, 32, 2001329. 

ACS Nano, 2018, 12, 7253. 

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2. Structural Engineering of Layered Nanomaterials for Biomedical Applications
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Layered nanomaterials, such as transition metal dichalcogenides (TMDs), layered metal oxides and layered double hydroxides (LDHs), have attracted considerable attention for various biomedical applications owning to their unique physiochemical properties. However, most of them suffer from the low activities/efficiencies when used for biomedical applications. Therefore, our aim is to develop high-performance nanoagents through structural engineering, including defect engineering, phase engineering, interlayer distancing, valance state engineering, etc., of layered nanomaterials, such as MoS2, MoO3, WO3 and LDHs, to realize excellent performance in a wide range of therapy strategies like photothermal therapy (PTT), photodynamic therapy (PDT), sonodynamic therapy (SDT), chemodynamic therapy (CDT) and catalytic therapy for cancer or antebrachial treatments. We focus on the science challenges lying in optimizing the performance of layered nanomaterials for biomedical applications by structural engineering.

Publication in This Direction:

Nat. Commun., 2022, Accepted.

Angew. Chem. Int. Ed., 2022, 61, e202115939.

Small, 2022, 18, 2200595.

J. Nanobiotechnology, 2022, 20, 136.

Small, 2021, 17, 2007486.

Chem. Eng. J., 2021, 419, 129458. 

Small, 2020, 16, 2004173.

Angew. Chem. Int. Ed., 2017, 56, 7842-7846.

J. Am. Chem. Soc., 2015, 137, 10430-10436.

3. 2D Material-Based Flexible Engergy and Sensing Devices and Their Integrated Wearable Systems

Ultrathin two-dimensional (2D) materials have shown great potential in fabrication of high-performance of flexible devices owing to their large lateral size and ultrathin thickness enabled excellent flexibility. However, most of 2D material-based flexible devices suffer from the low performance or unsatisfied mechanical properties. Therefore, our aim is to develop high-performance flexible energy storage devices (e.g., Zin-ion batteries and supercapacitors) and flexible sensing devices (e.g., gas sensing, humidity sensing, sweat sensing, etc.) based on various 2D materials, such as graphene, MXenes, TMDs (MoS2, WS2, etc.), metal oxides (e.g., MnO2). Moreover, the flexible energy storage devices can be further integrated with flexible sensing devices to construct flexible wearable self-powered systems. We focus on the science and technology challenges lying in optimizing the device and system performance by materials engineering and device structure engineering.

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Publication in This Direction:

Chem. Eng. J.2022438, 135588.

ACS Nano202115, 10597-10608.

Small, 2021, 17, 2006866.

Small Struct., 2021, 2, 2100067. 

J. Mater. Chem. A, 2021, 9, 18887-18905.

Adv. Mater.201628, 6167-6196.

4. Synthesis and Applications of Novel Functional 2D Materials and Composites
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Ultrathin two-dimensional (2D) materials represent an emerging class of nanomaterials that possess sheet-like structures with the lateral size larger than 100 nm, or up to few micrometers and even larger, but only single- or few-layer atomic thickness (typically less than 5 nm). The 2D feature is unique and indispensable to access unprecedented physical, electronic, and chemical properties due to electron confinement in two dimensions. However, the controlled synthesis of ultrathin 2D nanomaterials with desirable structural characteristics is still difficult to be realized by most of currently well-developed methods. We focused on the rational design and synthesis of novel 2D materials and 2D composites to achieve high performance in a number of applications such as electronics/optoelectronics, cancer therapy, electrocatalysis and energy storage.

Publication in This Direction:

Angew. Chem. Int. Ed., 2021, 60, 15556-15562.

Adv. Mater., 2021, 33, 2006661.

 Nat. Rev. Mater., 2018, 3, 17089.

Adv. Mater., 2018, 30, 1705509.

Chem. Rev., 2017, 117, 6225-6331.

Adv. Mater., 2017, 29, 1701392.

Small, 2016, 12, 1866-1874.

Adv. Mater., 2016, 28, 6167-6196.

Nat. Commun., 2015, 6, 7873.

J. Am. Chem. Soc., 2015, 137, 1565-1571.

J. Am. Chem. Soc., 2015, 137, 12162-12174.

Angew. Chem. Int. Ed., 2015, 54, 1841-1845.

Chem. Soc. Rev., 2015, 44, 2713-2731.

Chem. Soc. Rev., 2015, 44, 2615-2628.

Adv. Mater., 2014, 26, 1735-1739.

Energ. Environ. Sci., 2014, 7, 797-803. 

Adv. Mater., 2014, 26, 2185-2204.

Mater. Today, 2013, 16, 29-36.