Three dimensionally-ordered 2D MoS2 vertical layers integrated on flexible substrates with stretch-tunable functionality and improved sensing capability

Yeonwoong Jung; Md Ashraful Islam; Jung Han Kim; Tae Jun Ko; Chanwoo Noh; Shraddha Nehate; Md Golam Kaium; Minjee Ko; David Fox; Lei Zhai; Chang Hee Cho; Kalpathy B. Sundaram; Tae Sung Bae; Younjoon Jung; Hee Suk Chung

doi:10.1039/c8nr05362f

Three dimensionally-ordered 2D MoS₂ vertical layers integrated on flexible substrates with stretch-tunable functionality and improved sensing capability

Yeonwoong Jung, Md Ashraful Islam, Jung Han Kim, Tae Jun Ko, Chanwoo Noh, Shraddha Nehate, Md Golam Kaium, Minjee Ko, David Fox, Lei Zhai, Chang Hee Cho, Kalpathy B. Sundaram, Tae Sung Bae, Younjoon Jung, Hee Suk Chung

Department of Physics and Chemistry

Research output: Contribution to journal › Article › peer-review

31 Scopus citations

Abstract

The intrinsically anisotropic crystallinity of two-dimensional (2D) transition metal dichalcogenide (2D TMD) layers enables a variety of intriguing material properties which strongly depend on the physical orientation of constituent 2D layers. For instance, 2D TMDs with vertically-aligned layers exhibit numerous dangling bonds on their 2D layer edge sites predominantly exposed on the surface, projecting significantly improved physical and/or chemical adsorption capability compared to their horizontally-oriented 2D layer counterparts. Such property advantages can be further promoted as far as the material can be integrated onto unconventional substrates of tailored geometry/functionality, offering vast opportunities for a wide range of applications which demand enhanced surface area/reactivity and mechanical flexibility. Herein, we report a new form of 2D TMDs, i.e., three-dimensionally ordered 2D molybdenum disulfide (2D MoS₂) with vertically-aligned layers integrated on elastomeric substrates and explore their tunable multi-functionalities and technological promise. We grew large-scale (>2 cm²) vertically-aligned 2D MoS₂ layers using a three-dimensionally patterned silicon dioxide (SiO₂) template and directly transferred/integrated them onto flexible polydimethylsiloxane (PDMS) substrates by taking advantage of the distinguishable water-wettability of 2D MoS₂vs. SiO₂. The excellent structural integrity of the integrated vertical 2D MoS₂ layers was confirmed by extensive spectroscopy/microscopy characterization. In addition, the stretch-driven unique tunability of their optical and surface properties was also examined. Moreover, we applied this material for flexible humidity sensing and identified significantly improved (>10 times) sensitivity over conventionally-designed horizontal 2D MoS₂ layers, further confirming their high potential for unconventional flexible technologies.

Original language	English
Pages (from-to)	17525-17533
Number of pages	9
Journal	Nanoscale
Volume	10
Issue number	37
DOIs	https://doi.org/10.1039/c8nr05362f
State	Published - 7 Oct 2018

Bibliographical note

Publisher Copyright:
© 2018 The Royal Society of Chemistry.

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10.1039/c8nr05362f

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Jung, Y., Islam, M. A., Kim, J. H., Ko, T. J., Noh, C., Nehate, S., Kaium, M. G., Ko, M., Fox, D., Zhai, L., Cho, C. H., Sundaram, K. B., Bae, T. S., Jung, Y., & Chung, H. S. (2018). Three dimensionally-ordered 2D MoS₂ vertical layers integrated on flexible substrates with stretch-tunable functionality and improved sensing capability. Nanoscale, 10(37), 17525-17533. https://doi.org/10.1039/c8nr05362f

@article{07f14df4659943f6a6781bc1ec3dc4ca,

title = "Three dimensionally-ordered 2D MoS2 vertical layers integrated on flexible substrates with stretch-tunable functionality and improved sensing capability",

abstract = "The intrinsically anisotropic crystallinity of two-dimensional (2D) transition metal dichalcogenide (2D TMD) layers enables a variety of intriguing material properties which strongly depend on the physical orientation of constituent 2D layers. For instance, 2D TMDs with vertically-aligned layers exhibit numerous dangling bonds on their 2D layer edge sites predominantly exposed on the surface, projecting significantly improved physical and/or chemical adsorption capability compared to their horizontally-oriented 2D layer counterparts. Such property advantages can be further promoted as far as the material can be integrated onto unconventional substrates of tailored geometry/functionality, offering vast opportunities for a wide range of applications which demand enhanced surface area/reactivity and mechanical flexibility. Herein, we report a new form of 2D TMDs, i.e., three-dimensionally ordered 2D molybdenum disulfide (2D MoS2) with vertically-aligned layers integrated on elastomeric substrates and explore their tunable multi-functionalities and technological promise. We grew large-scale (>2 cm2) vertically-aligned 2D MoS2 layers using a three-dimensionally patterned silicon dioxide (SiO2) template and directly transferred/integrated them onto flexible polydimethylsiloxane (PDMS) substrates by taking advantage of the distinguishable water-wettability of 2D MoS2vs. SiO2. The excellent structural integrity of the integrated vertical 2D MoS2 layers was confirmed by extensive spectroscopy/microscopy characterization. In addition, the stretch-driven unique tunability of their optical and surface properties was also examined. Moreover, we applied this material for flexible humidity sensing and identified significantly improved (>10 times) sensitivity over conventionally-designed horizontal 2D MoS2 layers, further confirming their high potential for unconventional flexible technologies.",

author = "Yeonwoong Jung and Islam, {Md Ashraful} and Kim, {Jung Han} and Ko, {Tae Jun} and Chanwoo Noh and Shraddha Nehate and Kaium, {Md Golam} and Minjee Ko and David Fox and Lei Zhai and Cho, {Chang Hee} and Sundaram, {Kalpathy B.} and Bae, {Tae Sung} and Younjoon Jung and Chung, {Hee Suk}",

note = "Publisher Copyright: {\textcopyright} 2018 The Royal Society of Chemistry.",

year = "2018",

month = oct,

day = "7",

doi = "10.1039/c8nr05362f",

language = "English",

volume = "10",

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Jung, Y, Islam, MA, Kim, JH, Ko, TJ, Noh, C, Nehate, S, Kaium, MG, Ko, M, Fox, D, Zhai, L, Cho, CH, Sundaram, KB, Bae, TS, Jung, Y & Chung, HS 2018, 'Three dimensionally-ordered 2D MoS₂ vertical layers integrated on flexible substrates with stretch-tunable functionality and improved sensing capability', Nanoscale, vol. 10, no. 37, pp. 17525-17533. https://doi.org/10.1039/c8nr05362f

TY - JOUR

T1 - Three dimensionally-ordered 2D MoS2 vertical layers integrated on flexible substrates with stretch-tunable functionality and improved sensing capability

AU - Jung, Yeonwoong

AU - Islam, Md Ashraful

AU - Kim, Jung Han

AU - Ko, Tae Jun

AU - Noh, Chanwoo

AU - Nehate, Shraddha

AU - Kaium, Md Golam

AU - Ko, Minjee

AU - Fox, David

AU - Zhai, Lei

AU - Cho, Chang Hee

AU - Sundaram, Kalpathy B.

AU - Bae, Tae Sung

AU - Jung, Younjoon

AU - Chung, Hee Suk

PY - 2018/10/7

Y1 - 2018/10/7

N2 - The intrinsically anisotropic crystallinity of two-dimensional (2D) transition metal dichalcogenide (2D TMD) layers enables a variety of intriguing material properties which strongly depend on the physical orientation of constituent 2D layers. For instance, 2D TMDs with vertically-aligned layers exhibit numerous dangling bonds on their 2D layer edge sites predominantly exposed on the surface, projecting significantly improved physical and/or chemical adsorption capability compared to their horizontally-oriented 2D layer counterparts. Such property advantages can be further promoted as far as the material can be integrated onto unconventional substrates of tailored geometry/functionality, offering vast opportunities for a wide range of applications which demand enhanced surface area/reactivity and mechanical flexibility. Herein, we report a new form of 2D TMDs, i.e., three-dimensionally ordered 2D molybdenum disulfide (2D MoS2) with vertically-aligned layers integrated on elastomeric substrates and explore their tunable multi-functionalities and technological promise. We grew large-scale (>2 cm2) vertically-aligned 2D MoS2 layers using a three-dimensionally patterned silicon dioxide (SiO2) template and directly transferred/integrated them onto flexible polydimethylsiloxane (PDMS) substrates by taking advantage of the distinguishable water-wettability of 2D MoS2vs. SiO2. The excellent structural integrity of the integrated vertical 2D MoS2 layers was confirmed by extensive spectroscopy/microscopy characterization. In addition, the stretch-driven unique tunability of their optical and surface properties was also examined. Moreover, we applied this material for flexible humidity sensing and identified significantly improved (>10 times) sensitivity over conventionally-designed horizontal 2D MoS2 layers, further confirming their high potential for unconventional flexible technologies.

AB - The intrinsically anisotropic crystallinity of two-dimensional (2D) transition metal dichalcogenide (2D TMD) layers enables a variety of intriguing material properties which strongly depend on the physical orientation of constituent 2D layers. For instance, 2D TMDs with vertically-aligned layers exhibit numerous dangling bonds on their 2D layer edge sites predominantly exposed on the surface, projecting significantly improved physical and/or chemical adsorption capability compared to their horizontally-oriented 2D layer counterparts. Such property advantages can be further promoted as far as the material can be integrated onto unconventional substrates of tailored geometry/functionality, offering vast opportunities for a wide range of applications which demand enhanced surface area/reactivity and mechanical flexibility. Herein, we report a new form of 2D TMDs, i.e., three-dimensionally ordered 2D molybdenum disulfide (2D MoS2) with vertically-aligned layers integrated on elastomeric substrates and explore their tunable multi-functionalities and technological promise. We grew large-scale (>2 cm2) vertically-aligned 2D MoS2 layers using a three-dimensionally patterned silicon dioxide (SiO2) template and directly transferred/integrated them onto flexible polydimethylsiloxane (PDMS) substrates by taking advantage of the distinguishable water-wettability of 2D MoS2vs. SiO2. The excellent structural integrity of the integrated vertical 2D MoS2 layers was confirmed by extensive spectroscopy/microscopy characterization. In addition, the stretch-driven unique tunability of their optical and surface properties was also examined. Moreover, we applied this material for flexible humidity sensing and identified significantly improved (>10 times) sensitivity over conventionally-designed horizontal 2D MoS2 layers, further confirming their high potential for unconventional flexible technologies.

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U2 - 10.1039/c8nr05362f

DO - 10.1039/c8nr05362f

M3 - Article

C2 - 30211427

AN - SCOPUS:85054265257

SN - 2040-3364

VL - 10

SP - 17525

EP - 17533

JO - Nanoscale

JF - Nanoscale

IS - 37

ER -

Three dimensionally-ordered 2D MoS₂ vertical layers integrated on flexible substrates with stretch-tunable functionality and improved sensing capability

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