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Abstract
In the present work, a combination of imaging, spectroscopic and computational methods shows that 1-dodecanethiol undergoes S-deprotonation to form 1-dodecanethiolate on the surface of palladium nanoparticles, which then self-assembles into a structure that shows a high degree of order. The alkyl chain is largely in the all-trans conformation, which occurs despite the small size of the nanoparticle, (mean diameter = 3.9 nm). Inelastic neutron scattering spectroscopy is readily able to characterise organic surface layers on nanoparticles; the nature of the material is irrelevant: whether the nanoparticle core is an oxide, a metal or a semiconductor makes no difference. Comparison to DFT calculations allows insights into the nature and conformation of the adsorbed layer.
Highlights
Nanoparticle size materials have attracted remarkable academic and industrial interest due to the high surface area to volume ratio.[1,2] The main challenges of the academic and industrial researchers in the area of nanoparticles are the controllable syntheses of metal nanoparticles with a desired shape, size and structure.[3]
In this paper we present our results using a combination of techniques including inelastic neutron scattering (INS) spectroscopy
A combination of imaging, spectroscopic and computational methods shows that 1-dodecanethiol undergoes S-deprotonation to form 1-dodecanethiolate on the surface of the nanoparticle, that self-assembles into a structure that shows a high degree of order
Summary
Nanoparticle size materials have attracted remarkable academic and industrial interest due to the high surface area to volume ratio.[1,2] The main challenges of the academic and industrial researchers in the area of nanoparticles are the controllable syntheses of metal nanoparticles with a desired shape, size and structure.[3]. Adsorption of the 1-dodecanethiol, Fig. 3a, on the Pd nanoparticles, Fig. 3b, results in a 20 cmÀ1 blueshift, which is more clearly seen in the derivative-like difference spectrum, Fig. 3c.
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