Imperial College London

Prof Milo Shaffer

Faculty of Natural SciencesDepartment of Chemistry

Professor of Materials Chemistry



+44 (0)20 7594 5825m.shaffer Website




Mr John Murrell +44 (0)20 7594 2845




M221Royal College of ScienceSouth Kensington Campus






BibTex format

author = {Pike, SD and White, ER and Regoutz, A and Sammy, N and Payne, DJ and Williams, CK and Shaffer, MSP},
doi = {10.1021/acsnano.6b07694},
journal = {ACS Nano},
pages = {2714--2723},
title = {Reversible Redox Cycling of Well-Defined, Ultrasmall Cu/Cu2O Nanoparticles},
url = {},
volume = {11},
year = {2017}

RIS format (EndNote, RefMan)

AB - Exceptionally small and well-defined copper (Cu) and cuprite (Cu2O) nanoparticles (NPs) are synthesized by the reaction of mesitylcopper(I) with either H2 or air, respectively. In the presence of substoichiometric quantities of ligands, namely, stearic or di(octyl)phosphinic acid (0.1–0.2 equiv vs Cu), ultrasmall nanoparticles are prepared with diameters as low as ∼2 nm, soluble in a range of solvents. The solutions of Cu NPs undergo quantitative oxidation, on exposure to air, to form Cu2O NPs. The Cu2O NPs can be reduced back to Cu(0) NPs using accessible temperatures and low pressures of hydrogen (135 °C, 3 bar H2). This striking reversible redox cycling of the discrete, solubilized Cu/Cu(I) colloids was successfully repeated over 10 cycles, representing 19 separate reactions. The ligands influence the evolution of both composition and size of the nanoparticles, during synthesis and redox cycling, as explored in detail using vacuum-transfer aberration-corrected transmission electron microscopy, X-ray photoelectron spectroscopy, and visible spectroscopy.
AU - Pike,SD
AU - White,ER
AU - Regoutz,A
AU - Sammy,N
AU - Payne,DJ
AU - Williams,CK
AU - Shaffer,MSP
DO - 10.1021/acsnano.6b07694
EP - 2723
PY - 2017///
SN - 1936-0851
SP - 2714
TI - Reversible Redox Cycling of Well-Defined, Ultrasmall Cu/Cu2O Nanoparticles
T2 - ACS Nano
UR -
UR -
UR -
VL - 11
ER -