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Xia Jiang

Bio: Xia Jiang is an academic researcher from Hangzhou Dianzi University. The author has contributed to research in topics: Bilayer & Molybdenum disulfide. The author has an hindex of 1, co-authored 4 publications receiving 5 citations.

Papers
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Journal ArticleDOI
Fei Chen1, Xia Jiang1, Jiaqi Shao1, Bin Lu1, Li Fu1, Shichao Zhao1, Weitao Su1 
TL;DR: In this paper, the authors presented a feasible space-confined chemical vapor deposition method to grow 2D MoS2 flakes with tunable dimensionality by tailoring the experimental parameters, such as growth temperature, the amount of S powder, and the distance between Mo foil and growth substrate/S powder.
Abstract: Two-dimensional MoS2 is demonstrated to be a prospective material for next-generation ultrathin nanoelectronics and optoelectronics. However, it remains an enormous challenge to fabricate high-yield, large-sized, and high-quality monolayered MoS2 crystals. Here, we present a feasible space-confined chemical vapor deposition method to grow 2D MoS2 flakes with tunable dimensionality. By tailoring the experimental parameters, such as growth temperature, the amount of S powder, and the distance between Mo foil and growth substrate/S powder, diverse MoS2 flakes with adjustable edge size can be obtained, and their corresponding thickness and crystalline quality have been evaluated by OM, AFM, Raman and PL techniques. Furthermore, the reason for the evolution of lateral dimension under tuned S amount and adjusted distance between Mo foil and S powder/growth substrate is revealed by the concentration variation of Mo : S. Our study presents an effective pathway to realize the controllable fabrication of 2D TMDC structures with tunable dimensionality via simply adjusting growth conditions.

10 citations

Journal ArticleDOI
TL;DR: In this paper, a review of the controllable growth of 2D transition metal dichalcogenide (TMDC) vertical HSs is presented, which highlights recent advances in controllability of the 2D TMDC vertical HS via utilizing four main strategies during the CVD procedure.
Abstract: Two-dimensional (2D) vertical heterostructures (HSs) constructed via vertically stacking two or more 2D transition-metal dichalcogenide (TMDC) materials have been intensively studied over the past several years. However, it is still a great challenge to realize the controllable fabrication of 2D TMDC vertical HSs via the “bottom-up” growth strategy, which is regarded as a crucial step toward further performance study and device applications. So far, chemical vapor deposition (CVD) has been reported to be a feasible approach to achieve high controllability in the growth of various 2D materials, which has promoted the in-depth study of the CVD growth of 2D TMDC vertical HSs. In this review, we first introduce the fundamental properties as well as the diverse preparation strategies of various 2D TMDC-based vertical HSs. Major attention is paid to the controllable CVD growth of multitudinous 2D TMDC vertical HSs. This review highlights recent advances in the controllable growth of 2D TMDC vertical HSs via utilizing four main strategies during the CVD procedure, including the synthesis step, effect of growth temperature, precursor design, and substrate engineering. Finally, we discuss the major challenges and prospects in this rapidly advancing field of research.

6 citations

Journal ArticleDOI
Fei Chen1, Xia Jiang1, Jiaqi Shao1, Li Fu1, Shichao Zhao1, Weitao Su1 
TL;DR: In this paper, the morphology, structure, and fundamental features of as-produced domains are systematically characterized via utilizing optical microscopy, atomic force microscopy and Raman/PL system, elucidating bilayer feature of various MoS2 flakes.

2 citations


Cited by
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Journal ArticleDOI
TL;DR: In this article, a review highlights recent advancements on 2D layered materials, including graphene, transitional metal dichalcogenides (TMDs), layered double hydroxides (LDHs), MXene, and graphitic carbon nitride (g-C3N4), as cost-effective and highly efficient electrocatalysts for hydrogen production.
Abstract: The production of hydrogen via the water splitting process is one of the most promising technologies for future clean energy requirements, and one of the best related challenges is the choice of the most highly efficient and cost effective electrocatalyst. Conventional electrocatalysts based on precious metals are rare and very-expensive for large-scale production of hydrogen, demanding the exploration for low-cost earth abundant alternatives. In this context, extensive works from both theoretical and experimental investigations have shown that two-dimensional (2D) layered materials have gained considerable attention as highly effective electrocatalytic materials for electrical-driven hydrogen production because of their unique layered structure and exciting electrical properties. This review highlights recent advancements on 2D layered materials, including graphene, transitional metal dichalcogenides (TMDs), layered double hydroxides (LDHs), MXene, and graphitic carbon nitride (g-C3N4) as cost-effective and highly efficient electrocatalysts for hydrogen production. In addition, some fundamental aspects of the hydrogen evolution reaction (HER) process and a wide ranging overview on several strategies to design and synthesize 2D layered material as HER electrocatalysts for commercial applications are introduced. Finally, the conclusion and futuristic prospects and challenges of the advancement of 2D layered materials as non-precious HER electrocatalysts are briefly discussed.

15 citations

Journal ArticleDOI
01 Aug 2022-ACS Nano
TL;DR: In this article , selective Nb doping at the WS2 layer in a WS2-MoS2 lateral heterostructure via a chemical vapor deposition (CVD) method using a solution-phase precursor containing W, Mo, and Nb atoms is proposed.
Abstract: In this study, selective Nb doping (P-type) at the WS2 layer in a WS2-MoS2 lateral heterostructure via a chemical vapor deposition (CVD) method using a solution-phase precursor containing W, Mo, and Nb atoms is proposed. The different chemical activity reactivity (MoO3 > WO3 > Nb2O5) enable the separation of the growth temperature of intrinsic MoS2 to 700 °C (first grown inner layer) and Nb-doped WS2 to 800 °C (second grown outer layer). By controlling the Nb/(W+Nb) molar ratio in the solution precursor, the hole carrier density in the p-type WS2 layer is selectively controlled from approximately 1.87 × 107/cm2 at 1.5 at.% Nb to approximately 1.16 × 1013/cm2 at 8.1 at.% Nb, while the electron carrier density in n-type MoS2 shows negligible change with variation of the Nb molar ratio. As a result, the electrical behavior of the WS2-MoS2 heterostructure transforms from the N-N junction (0 at.% Nb) to the P-N junction (4.5 at.% Nb) and the P-N tunnel junction (8.1 at.% Nb). The band-to-band tunneling at the P-N tunnel junction (8.1 at.% Nb) is eliminated by applying negative gate bias, resulting in a maximum rectification ratio (105) and a minimum channel resistance (108 Ω). With this optimized photodiode (8.1 at.% Nb at Vg = -30 V), an Iphoto/Idark ratio of 6000 and a detectivity of 1.1 × 1014 Jones are achieved, which are approximately 20 and 3 times higher, respectively, than the previously reported highest values for CVD-grown transition-metal dichalcogenide P-N junctions.

10 citations

Journal ArticleDOI
TL;DR: In this paper, the authors reported the synthesis of monolayer MoS2 flakes at atmospheric pressure using a home-built CVD setup, where a wide range of shapes are grown from triangular shapes to many point stars via in-between shapes such as four and six-point stars, using the weight ratio variation of MoO3 and S precursors at different growth temperatures.
Abstract: Monolayer MoS2 has received special consideration owing to its intriguing properties and its potential to revolutionize modern technologies. Atmospheric pressure chemical vapor deposition (APCVD) is the traditional method to grow uniform and high-quality MoS2 flakes in a controlled manner. Little is known, however, about their synthesis mechanism and shape evolution. Herein, we report the synthesis of monolayer MoS2 flakes at atmospheric pressure using a home-built CVD setup. A wide range of shapes are grown from triangular shapes to many point stars, via in-between shapes such as four and six-point stars, using the weight ratio variation of MoO3 and S precursors at different growth temperatures. Further, the properties of the as-grown MoS2 flakes are probed by optical microscopy, scanning electron microscopy (SEM), energy dispersive X-ray analysis (EDX), Raman spectroscopy, photoluminescence (PL), atomic force microscopy (AFM), and X-ray photoelectron spectroscopy (XPS), confirming that they are regular and good in quality. Moreover, the synthesis pathway and different shape formations are explained on the basis of the fluid model and the growing rate of Mo, S zigzag edges. Thus, this work provides a better insight into the synthesis mechanism of monolayer MoS2 and represents a significant step towards realizing potential future applications.

8 citations

Journal ArticleDOI
TL;DR: In this paper, a review of the controllable growth of 2D transition metal dichalcogenide (TMDC) vertical HSs is presented, which highlights recent advances in controllability of the 2D TMDC vertical HS via utilizing four main strategies during the CVD procedure.
Abstract: Two-dimensional (2D) vertical heterostructures (HSs) constructed via vertically stacking two or more 2D transition-metal dichalcogenide (TMDC) materials have been intensively studied over the past several years. However, it is still a great challenge to realize the controllable fabrication of 2D TMDC vertical HSs via the “bottom-up” growth strategy, which is regarded as a crucial step toward further performance study and device applications. So far, chemical vapor deposition (CVD) has been reported to be a feasible approach to achieve high controllability in the growth of various 2D materials, which has promoted the in-depth study of the CVD growth of 2D TMDC vertical HSs. In this review, we first introduce the fundamental properties as well as the diverse preparation strategies of various 2D TMDC-based vertical HSs. Major attention is paid to the controllable CVD growth of multitudinous 2D TMDC vertical HSs. This review highlights recent advances in the controllable growth of 2D TMDC vertical HSs via utilizing four main strategies during the CVD procedure, including the synthesis step, effect of growth temperature, precursor design, and substrate engineering. Finally, we discuss the major challenges and prospects in this rapidly advancing field of research.

6 citations