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Mikkelä MH, Jänkälä K, Huttula M, Björneholm O, Tchaplyguine M. Free silver nanoparticles doped by potassium: Work-function change in experiment and theory. J Chem Phys 2021; 154:234708. [PMID: 34241256 DOI: 10.1063/5.0052101] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The composition-dependent change in the work-function (WF) of binary silver-potassium nanoparticles has been studied experimentally by synchrotron-based x-ray photoelectron spectroscopy (PES) and theoretically using a microscopic jellium model of metals. The Ag-K particles with different K fractions were produced by letting a beam of preformed Ag particles pass through a volume with K vapor. The PES on a beam of individual non-supported Ag-K nanoparticles created in this way allowed a direct absolute measurement of their WF, avoiding several usual shortcomings of the method. Experimentally, the WF has been found to be very sensitive to K concentration: Already at low exposure, it decreased down to ≈2 eV-below the value of pure K. In the jellium modeling, considered for Ag-K nanoparticles, two principally different adsorption patterns were tested: without and with K diffusion. The experimental and calculation results together suggest that only efficient surface alloying of two metals, whose immiscibility was long-term textbook knowledge, could lead to the observed WF values.
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Affiliation(s)
| | - Kari Jänkälä
- Nano and Molecular Systems Research Unit, University of Oulu, 90014 Oulu, Finland
| | - Marko Huttula
- Nano and Molecular Systems Research Unit, University of Oulu, 90014 Oulu, Finland
| | - Olle Björneholm
- Department of Physics and Astronomy, Uppsala University, 75120 Uppsala, Sweden
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Saha S, Jana M, Samanta P, Murmu NC, Kuila T. Efficient Access of Voltammetric Charge in Hybrid Supercapacitor Configured with Potassium Incorporated Nanographitic Structure Derived from Cotton (Gossypium arboreum) as Negative and Ni(OH)2/rGO Composite as Positive Electrode. Ind Eng Chem Res 2016. [DOI: 10.1021/acs.iecr.6b02294] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Sanjit Saha
- Surface Engineering & Tribology Division and ‡Academy of Scientific and Innovative Research (AcSIR), CSIR-Central Mechanical Engineering Research Institute, Durgapur 713209, India
| | - Milan Jana
- Surface Engineering & Tribology Division and ‡Academy of Scientific and Innovative Research (AcSIR), CSIR-Central Mechanical Engineering Research Institute, Durgapur 713209, India
| | - Pranab Samanta
- Surface Engineering & Tribology Division and ‡Academy of Scientific and Innovative Research (AcSIR), CSIR-Central Mechanical Engineering Research Institute, Durgapur 713209, India
| | - Naresh C. Murmu
- Surface Engineering & Tribology Division and ‡Academy of Scientific and Innovative Research (AcSIR), CSIR-Central Mechanical Engineering Research Institute, Durgapur 713209, India
| | - Tapas Kuila
- Surface Engineering & Tribology Division and ‡Academy of Scientific and Innovative Research (AcSIR), CSIR-Central Mechanical Engineering Research Institute, Durgapur 713209, India
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Lee BJ, Gebhardt C, Schröder H, Kompa K, Dürr M. Observation of ionic desorption channels in cluster-induced desorption of alkali halides – Influence of surface electronic properties and surface configuration. Chem Phys Lett 2013. [DOI: 10.1016/j.cplett.2012.11.031] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Neugebauer J, Scheffler M. Mechanisms of island formation of alkali-metal adsorbates on Al(111). PHYSICAL REVIEW LETTERS 1993; 71:577-580. [PMID: 10055311 DOI: 10.1103/physrevlett.71.577] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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Rudolf P, Astaldi C, Bianco A, Modesti S. Ca chemisorption on Cu(100) in the submonolayer regime: Metastable and stable adsorption phases. PHYSICAL REVIEW. B, CONDENSED MATTER 1993; 47:4123-4126. [PMID: 10006548 DOI: 10.1103/physrevb.47.4123] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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