Surface Modification of Small Platinum Nanoclusters with Alkylamine and Alkylthiol: An XPS Study on the Influence of Organic Ligands on the Pt 4f Binding Energies of Small Platinum Nanoclusters

• Published in: Journal of colloid and interface science Vol. 243; no. 2; pp. 326 - 330
• Main Authors: Fu, Xiaoyi, Wang, Yuan, Wu, Nianzu, Gui, Linlin, Tang, Youqi
• Format: Journal Article
• Language: English
• Published: San Diego, CA Elsevier Inc 15.11.2001; Elsevier
• Subjects: amine; Chemistry; Colloidal state and disperse state; Exact sciences and technology; General and physical chemistry; ligand effect; nanoclusters; Physical and chemical studies. Granulometry. Electrokinetic phenomena; thiol; XPS; thiol; ligand effect; XPS; nanoclusters; Pt; amine; Phase transfer reaction; Ligand effect; Tertiary phosphine; Alkylamine; Organic ligand; Alkanethiol; Nanostructure; Transition metal Complexes; Experimental study; X ray diffraction; Platinum complex; Polyvinylalcohol; Metal cluster; Particle size distribution; Pyrrolidone(vinyl) polymer; Binding energy; Preparation; Photoelectron spectrometry
• ISSN: 0021-9797; 1095-7103
• DOI: 10.1006/jcis.2001.7861

Platinum nanoclusters of average size 1.3 nm, modified with alkylamine, and alkylthiol, were prepared by a simple phase-transfer method using a small Pt nanocluster stabilized by glycol and OH− as a building block. Transmission electron microscopy, thermogravimetric analysis, 1H NMR, and X-ray photoelectron spectroscopy analyses were carried out on these metal nanoclusters. It was observed that the Pt 4f binding energies in the same-sized Pt nanoclusters modified with alkylamine, alkylthiol, PVP, PVA, or PPh3 increase by 0.5–0.8 eV relative to those of bulk Pt. The shifts in the binding energies are caused by a size effect of the small Pt core and a ligand effect from the modifiers. By deducing the small size effect, the ligand effect on the Pt 4f binding energies was studied.