Abrupt Thermal Shock of (NH4)2Mo3S13 Leads to Ultrafast Synthesis of Porous Ensembles of MoS2 Nanocrystals for High Gain Photodetectors

Saiful M. Islam, Vinod K. Sangwan, Yuan Li, Joohoon Kang, Xiaomi Zhang, Yihui He, Jing Zhao, Akshay Murthy, Shulan Ma, Vinayak P. Dravid, Mark C Hersam, Mercouri G Kanatzidis

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Ultrafast synthesis of high-quality transition-metal dichalcogenide nanocrystals, such as molybdenum disulfide (MoS2), is technologically relevant for large-scale production of electronic and optoelectronic devices. Here, we report a rapid solid-state synthesis route for MoS2 using the chemically homogeneous molecular precursor, (NH4)2Mo3S13·H2O, resulting in nanoparticles with estimated size down to 25 nm only in 10 s at 1000 °C. Despite the extreme nonequilibrium conditions, the resulting porous MoS2 nanoparticles remain aggregated to preserve the form of the original rod shape bulk morphology of the molecular precursor. This ultrafast synthesis proceeds through the rapid decomposition of the precursor and rearrangement of Mo and S atoms coupled with simultaneous efficient release of massive gaseous species, to create nanoscale porosity in the resulting isomorphic pseudocrystals, which are composed of the MoS2 nanoparticles. Despite the very rapid escape of massive amounts of NH3, H2O, H2S, and S gases from the (NH4)2Mo3S13·H2O mm sized crystals, they retain their original shape as they convert to MoS2 rather than undergo explosive destruction from the rapid escape process of the gases. The obtained pseudocrystals are made of aggregated MoS2 nanocrystals exhibit a Brunauer-Emmett-Teller surface area of ∼35 m2/g with an adsorption average pore width of ∼160 Å. The nanoporous MoS2 crystals are solution processable by dispersing in ethanol and water and can be cast into large-area uniform composite films. Photodetectors fabricated from these films show more than 2 orders of magnitude higher conductivity (∼6.25 × 10-6 S/cm) and photoconductive gain (20 mA/W) than previous reports of MoS2 composite films. The optoelectronic properties of this nanoporous MoS2 imply that the shallow defects that originate from the ultrafast synthesis act as sensitizing centers that increase the photocurrent gain via two-level recombination kinetics.

Original languageEnglish
Pages (from-to)38193-38200
Number of pages8
JournalACS Applied Materials and Interfaces
Volume10
Issue number44
DOIs
Publication statusPublished - Nov 7 2018

Fingerprint

Thermal shock
Photodetectors
Nanocrystals
Composite films
Nanoparticles
Optoelectronic devices
Gases
Crystals
Photocurrents
Molybdenum
Transition metals
Ethanol
Porosity
Decomposition
Adsorption
Atoms
Defects
Kinetics
Water

Keywords

  • photodetector
  • porous MoS nanocrystal
  • solid-state synthesis
  • thin films

ASJC Scopus subject areas

  • Materials Science(all)

Cite this

Abrupt Thermal Shock of (NH4)2Mo3S13 Leads to Ultrafast Synthesis of Porous Ensembles of MoS2 Nanocrystals for High Gain Photodetectors. / Islam, Saiful M.; Sangwan, Vinod K.; Li, Yuan; Kang, Joohoon; Zhang, Xiaomi; He, Yihui; Zhao, Jing; Murthy, Akshay; Ma, Shulan; Dravid, Vinayak P.; Hersam, Mark C; Kanatzidis, Mercouri G.

In: ACS Applied Materials and Interfaces, Vol. 10, No. 44, 07.11.2018, p. 38193-38200.

Research output: Contribution to journalArticle

Islam, Saiful M. ; Sangwan, Vinod K. ; Li, Yuan ; Kang, Joohoon ; Zhang, Xiaomi ; He, Yihui ; Zhao, Jing ; Murthy, Akshay ; Ma, Shulan ; Dravid, Vinayak P. ; Hersam, Mark C ; Kanatzidis, Mercouri G. / Abrupt Thermal Shock of (NH4)2Mo3S13 Leads to Ultrafast Synthesis of Porous Ensembles of MoS2 Nanocrystals for High Gain Photodetectors. In: ACS Applied Materials and Interfaces. 2018 ; Vol. 10, No. 44. pp. 38193-38200.
@article{2a1e715c2b8141e58831ee94cc2f44d9,
title = "Abrupt Thermal Shock of (NH4)2Mo3S13 Leads to Ultrafast Synthesis of Porous Ensembles of MoS2 Nanocrystals for High Gain Photodetectors",
abstract = "Ultrafast synthesis of high-quality transition-metal dichalcogenide nanocrystals, such as molybdenum disulfide (MoS2), is technologically relevant for large-scale production of electronic and optoelectronic devices. Here, we report a rapid solid-state synthesis route for MoS2 using the chemically homogeneous molecular precursor, (NH4)2Mo3S13·H2O, resulting in nanoparticles with estimated size down to 25 nm only in 10 s at 1000 °C. Despite the extreme nonequilibrium conditions, the resulting porous MoS2 nanoparticles remain aggregated to preserve the form of the original rod shape bulk morphology of the molecular precursor. This ultrafast synthesis proceeds through the rapid decomposition of the precursor and rearrangement of Mo and S atoms coupled with simultaneous efficient release of massive gaseous species, to create nanoscale porosity in the resulting isomorphic pseudocrystals, which are composed of the MoS2 nanoparticles. Despite the very rapid escape of massive amounts of NH3, H2O, H2S, and S gases from the (NH4)2Mo3S13·H2O mm sized crystals, they retain their original shape as they convert to MoS2 rather than undergo explosive destruction from the rapid escape process of the gases. The obtained pseudocrystals are made of aggregated MoS2 nanocrystals exhibit a Brunauer-Emmett-Teller surface area of ∼35 m2/g with an adsorption average pore width of ∼160 {\AA}. The nanoporous MoS2 crystals are solution processable by dispersing in ethanol and water and can be cast into large-area uniform composite films. Photodetectors fabricated from these films show more than 2 orders of magnitude higher conductivity (∼6.25 × 10-6 S/cm) and photoconductive gain (20 mA/W) than previous reports of MoS2 composite films. The optoelectronic properties of this nanoporous MoS2 imply that the shallow defects that originate from the ultrafast synthesis act as sensitizing centers that increase the photocurrent gain via two-level recombination kinetics.",
keywords = "photodetector, porous MoS nanocrystal, solid-state synthesis, thin films",
author = "Islam, {Saiful M.} and Sangwan, {Vinod K.} and Yuan Li and Joohoon Kang and Xiaomi Zhang and Yihui He and Jing Zhao and Akshay Murthy and Shulan Ma and Dravid, {Vinayak P.} and Hersam, {Mark C} and Kanatzidis, {Mercouri G}",
year = "2018",
month = "11",
day = "7",
doi = "10.1021/acsami.8b12406",
language = "English",
volume = "10",
pages = "38193--38200",
journal = "ACS applied materials & interfaces",
issn = "1944-8244",
publisher = "American Chemical Society",
number = "44",

}

TY - JOUR

T1 - Abrupt Thermal Shock of (NH4)2Mo3S13 Leads to Ultrafast Synthesis of Porous Ensembles of MoS2 Nanocrystals for High Gain Photodetectors

AU - Islam, Saiful M.

AU - Sangwan, Vinod K.

AU - Li, Yuan

AU - Kang, Joohoon

AU - Zhang, Xiaomi

AU - He, Yihui

AU - Zhao, Jing

AU - Murthy, Akshay

AU - Ma, Shulan

AU - Dravid, Vinayak P.

AU - Hersam, Mark C

AU - Kanatzidis, Mercouri G

PY - 2018/11/7

Y1 - 2018/11/7

N2 - Ultrafast synthesis of high-quality transition-metal dichalcogenide nanocrystals, such as molybdenum disulfide (MoS2), is technologically relevant for large-scale production of electronic and optoelectronic devices. Here, we report a rapid solid-state synthesis route for MoS2 using the chemically homogeneous molecular precursor, (NH4)2Mo3S13·H2O, resulting in nanoparticles with estimated size down to 25 nm only in 10 s at 1000 °C. Despite the extreme nonequilibrium conditions, the resulting porous MoS2 nanoparticles remain aggregated to preserve the form of the original rod shape bulk morphology of the molecular precursor. This ultrafast synthesis proceeds through the rapid decomposition of the precursor and rearrangement of Mo and S atoms coupled with simultaneous efficient release of massive gaseous species, to create nanoscale porosity in the resulting isomorphic pseudocrystals, which are composed of the MoS2 nanoparticles. Despite the very rapid escape of massive amounts of NH3, H2O, H2S, and S gases from the (NH4)2Mo3S13·H2O mm sized crystals, they retain their original shape as they convert to MoS2 rather than undergo explosive destruction from the rapid escape process of the gases. The obtained pseudocrystals are made of aggregated MoS2 nanocrystals exhibit a Brunauer-Emmett-Teller surface area of ∼35 m2/g with an adsorption average pore width of ∼160 Å. The nanoporous MoS2 crystals are solution processable by dispersing in ethanol and water and can be cast into large-area uniform composite films. Photodetectors fabricated from these films show more than 2 orders of magnitude higher conductivity (∼6.25 × 10-6 S/cm) and photoconductive gain (20 mA/W) than previous reports of MoS2 composite films. The optoelectronic properties of this nanoporous MoS2 imply that the shallow defects that originate from the ultrafast synthesis act as sensitizing centers that increase the photocurrent gain via two-level recombination kinetics.

AB - Ultrafast synthesis of high-quality transition-metal dichalcogenide nanocrystals, such as molybdenum disulfide (MoS2), is technologically relevant for large-scale production of electronic and optoelectronic devices. Here, we report a rapid solid-state synthesis route for MoS2 using the chemically homogeneous molecular precursor, (NH4)2Mo3S13·H2O, resulting in nanoparticles with estimated size down to 25 nm only in 10 s at 1000 °C. Despite the extreme nonequilibrium conditions, the resulting porous MoS2 nanoparticles remain aggregated to preserve the form of the original rod shape bulk morphology of the molecular precursor. This ultrafast synthesis proceeds through the rapid decomposition of the precursor and rearrangement of Mo and S atoms coupled with simultaneous efficient release of massive gaseous species, to create nanoscale porosity in the resulting isomorphic pseudocrystals, which are composed of the MoS2 nanoparticles. Despite the very rapid escape of massive amounts of NH3, H2O, H2S, and S gases from the (NH4)2Mo3S13·H2O mm sized crystals, they retain their original shape as they convert to MoS2 rather than undergo explosive destruction from the rapid escape process of the gases. The obtained pseudocrystals are made of aggregated MoS2 nanocrystals exhibit a Brunauer-Emmett-Teller surface area of ∼35 m2/g with an adsorption average pore width of ∼160 Å. The nanoporous MoS2 crystals are solution processable by dispersing in ethanol and water and can be cast into large-area uniform composite films. Photodetectors fabricated from these films show more than 2 orders of magnitude higher conductivity (∼6.25 × 10-6 S/cm) and photoconductive gain (20 mA/W) than previous reports of MoS2 composite films. The optoelectronic properties of this nanoporous MoS2 imply that the shallow defects that originate from the ultrafast synthesis act as sensitizing centers that increase the photocurrent gain via two-level recombination kinetics.

KW - photodetector

KW - porous MoS nanocrystal

KW - solid-state synthesis

KW - thin films

UR - http://www.scopus.com/inward/record.url?scp=85056210738&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85056210738&partnerID=8YFLogxK

U2 - 10.1021/acsami.8b12406

DO - 10.1021/acsami.8b12406

M3 - Article

C2 - 30299078

AN - SCOPUS:85056210738

VL - 10

SP - 38193

EP - 38200

JO - ACS applied materials & interfaces

JF - ACS applied materials & interfaces

SN - 1944-8244

IS - 44

ER -