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Adsorption Kinetics of WS2 Quantum Dots onto a Polycrystalline Gold Surface.

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Title: Adsorption Kinetics of WS2 Quantum Dots onto a Polycrystalline Gold Surface.
Authors: Valappil, Manila Ozhukil1,2, Alwarappan, Subbiah1,2, Pillai, Vijayamohanan K.1,2, Roopesh, Mekkat3
Source: Langmuir. 5/15/2018, Vol. 34 Issue 19, p5474-5380. 7p.
Subjects: Adsorption kinetics, Tungsten compounds, Quantum dots, Langmuir isotherms, Thermodynamics
Abstract: In this work, we report the adsorption kinetics of electrochemically synthesized WS2 quantum dots (QDs) (ca. 3 nm) onto a polycrystalline gold electrode. The Langmuir adsorption isotherm approach was employed to explore the temperature and adsorbate concentration dependence of the experimentally calculated equilibrium constant of adsorption (Keq) and the free energy for adsorption (ΔGads). Subsequently, we extract other thermodynamic parameters, such as adsorption rate constant (Kads), desorption rate constant (Kd), the enthalpy of adsorption (ΔHads), and the entropy of adsorption (ΔSads). Our findings indicate that ΔGads is temperature-dependent and ca. -7.64 ± 0.6 kJ/mol, ΔHads = -43.72 ± 1.7 kJ/mol, and ΔSads = -0.126 ± 0.017 kJ/(mol K). These investigations on the contribution of the enthalpic and entropic forces to the total free energy of this system underscore the role of entropic forces on the stability of the WS2 QDs monolayer and provide new thermodynamic insights into other transition-metal dichalcogenide quantum dot (TMDQD) monolayers as well. [ABSTRACT FROM AUTHOR]
Copyright of Langmuir is the property of American Chemical Society and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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DbLabel: Engineering Source
An: 129640337
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  Data: Adsorption Kinetics of WS<subscript>2</subscript> Quantum Dots onto a Polycrystalline Gold Surface.
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  Data: <searchLink fieldCode="JN" term="%22Langmuir%22">Langmuir</searchLink>. 5/15/2018, Vol. 34 Issue 19, p5474-5380. 7p.
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  Data: <searchLink fieldCode="DE" term="%22Adsorption+kinetics%22">Adsorption kinetics</searchLink><br /><searchLink fieldCode="DE" term="%22Tungsten+compounds%22">Tungsten compounds</searchLink><br /><searchLink fieldCode="DE" term="%22Quantum+dots%22">Quantum dots</searchLink><br /><searchLink fieldCode="DE" term="%22Langmuir+isotherms%22">Langmuir isotherms</searchLink><br /><searchLink fieldCode="DE" term="%22Thermodynamics%22">Thermodynamics</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: In this work, we report the adsorption kinetics of electrochemically synthesized WS2 quantum dots (QDs) (ca. 3 nm) onto a polycrystalline gold electrode. The Langmuir adsorption isotherm approach was employed to explore the temperature and adsorbate concentration dependence of the experimentally calculated equilibrium constant of adsorption (Keq) and the free energy for adsorption (ΔGads). Subsequently, we extract other thermodynamic parameters, such as adsorption rate constant (Kads), desorption rate constant (Kd), the enthalpy of adsorption (ΔHads), and the entropy of adsorption (ΔSads). Our findings indicate that ΔGads is temperature-dependent and ca. -7.64 ± 0.6 kJ/mol, ΔHads = -43.72 ± 1.7 kJ/mol, and ΔSads = -0.126 ± 0.017 kJ/(mol K). These investigations on the contribution of the enthalpic and entropic forces to the total free energy of this system underscore the role of entropic forces on the stability of the WS2 QDs monolayer and provide new thermodynamic insights into other transition-metal dichalcogenide quantum dot (TMDQD) monolayers as well. [ABSTRACT FROM AUTHOR]
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  Data: <i>Copyright of Langmuir is the property of American Chemical Society and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
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      – Type: doi
        Value: 10.1021/acs.langmuir.7b03321
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      – Code: eng
        Text: English
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        PageCount: 7
        StartPage: 5474
    Subjects:
      – SubjectFull: Adsorption kinetics
        Type: general
      – SubjectFull: Tungsten compounds
        Type: general
      – SubjectFull: Quantum dots
        Type: general
      – SubjectFull: Langmuir isotherms
        Type: general
      – SubjectFull: Thermodynamics
        Type: general
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      – TitleFull: Adsorption Kinetics of WS2 Quantum Dots onto a Polycrystalline Gold Surface.
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            NameFull: Valappil, Manila Ozhukil
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            NameFull: Alwarappan, Subbiah
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            NameFull: Pillai, Vijayamohanan K.
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            NameFull: Roopesh, Mekkat
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            – D: 15
              M: 05
              Text: 5/15/2018
              Type: published
              Y: 2018
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              Value: 34
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              Value: 19
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