H3PW12O40-functionalized tip for scanning tunneling microscopy

Proceedings of the National Academy of Sciences of the United States of America
In K SongMark A. Barteau

Abstract

Recent reports of C(60)-functionalized metal tips [Kelly, K. F., Sarkar, D., Hale, G. D., Oldenburg, S. J. & Halas, N. J. (1996) Science 273, 1371-1373] and carbon nanotube tips [Dai, H., Hafner, J. H., Rinzler, A. G., Colbert, D. T. & Smalley, R. E. (1996) Nature (London) 384, 147-151] demonstrate the potential of controlling the chemical identity and geometric structure of tip atoms in scanning tunneling microscopy (STM). This work reports the performance of a heteropolyacid (HPA)-functionalized Pt/Ir tip, which was formulated by contacting a mechanically formed tip with a solution of H(3)PW(12)O(40) molecules. Attachment of an H(3)PW(12)O(40) molecule on the metal tip was confirmed by observing the characteristic negative differential resistance (NDR) behavior of H(3)PW(12)O(40) in tunneling spectroscopy. Atomic resolution images of bare graphite as well as of H(6)P(2)W(18)O(62) HPA monolayers on graphite were successfully obtained with a Pt/Ir-HPA tip. In the H(3)PW(12)O(40) molecule on a metal tip, it is likely that a terminal oxygen of WO (an oxygen species projecting outward from the pseudospherical H(3)PW(12)O(40) molecule) serves as an atomically sharp and stable tip. Additionally, superimposed superperiodic structures...Continue Reading

References

Aug 30, 2000·Proceedings of the National Academy of Sciences of the United States of America·K F KellyN J Halas

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Citations

Feb 21, 2019·Nature Communications·Xin LiuMichael D Guiver
Nov 7, 2018·Acta Crystallographica. Section C, Structural Chemistry·Bouchra El BakkaliSantiago Reinoso

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