Free silver nanoparticles doped by potassium : work-function change in experiment and theory |
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Author: | Mikkelä, Mikko-Heikki1; Jänkälä, Kari2; Huttula, Marko2; |
Organizations: |
1MAX-IV Laboratory, Lund University, P.O. Box 118, 22100 Lund, Sweden 2Nano and Molecular Systems Research Unit, University of Oulu, 90014 Oulu, Finlan 3Department of Physics and Astronomy, Uppsala University, 75120 Uppsala, Sweden |
Format: | article |
Version: | published version |
Access: | open |
Online Access: | PDF Full Text (PDF, 6.5 MB) |
Persistent link: | http://urn.fi/urn:nbn:fi-fe2021062339710 |
Language: | English |
Published: |
American Institute of Physics,
2021
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Publish Date: | 2022-06-18 |
Description: |
AbstractThe 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. see all
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Series: |
Journal of chemical physics |
ISSN: | 0021-9606 |
ISSN-E: | 1089-7690 |
ISSN-L: | 0021-9606 |
Volume: | 154 |
Article number: | 234708 |
DOI: | 10.1063/5.0052101 |
OADOI: | https://oadoi.org/10.1063/5.0052101 |
Type of Publication: |
A1 Journal article – refereed |
Field of Science: |
114 Physical sciences 116 Chemical sciences |
Subjects: | |
Dataset Reference: |
The data that support the findings of this study are available from the corresponding author upon reasonable request. |
Copyright information: |
© 2021 Author(s). Published under an exclusive license by AIP Publishing. |