Mikkelä, M.-H., Jänkälä, K., Huttula, M., Björneholm, O., & Tchaplyguine, M. (2021). Free silver nanoparticles doped by potassium: Work-function change in experiment and theory. The Journal of Chemical Physics, 154(23), 234708. https://doi.org/10.1063/5.0052101
Free silver nanoparticles doped by potassium : work-function change in experiment and theory
|Author:||Mikkelä, Mikko-Heikki1; Jänkälä, Kari2; Huttula, Marko2;|
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
|Online Access:||PDF Full Text (PDF, 6.5 MB)|
|Persistent link:|| http://urn.fi/urn:nbn:fi-fe2021062339710
American Institute of Physics,
|Publish Date:|| 2022-06-18
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.
Journal of chemical physics
|Type of Publication:||
A1 Journal article – refereed
|Field of Science:||
114 Physical sciences
116 Chemical sciences
The data that support the findings of this study are available from the corresponding author upon reasonable request.
© 2021 Author(s). Published under an exclusive license by AIP Publishing.