Final published version
Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
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TY - JOUR
T1 - Quantised double layer charging of monolayer-protected clusters in a room temperature ionic liquid
AU - Mertens, S.F.L.
AU - Blech, K.
AU - Sologubenko, A.S.
AU - Mayer, J.
AU - Simon, U.
AU - Wandlowski, T.
PY - 2009
Y1 - 2009
N2 - We report, for the first time, symmetric (versus cluster potential of zero charge) charging of narrowly dispersed monolayer-protected Au 145 cluster films in a room temperature ionic liquid. Near-reversible voltammetric features are found, indicating up to nine electrochemically accessible charge states with assigned values between -4 and +5. The zero charge state has a stability range of 276 mV, very similar as found in solution-phase voltammetry. All other charge states are more narrowly spaced, indicating a sudden increase in cluster capacitance. We ascribe this effect to an abrupt change in local dielectric constant on insertion of one or more counter ions, following departure from zero charge, with a possible contribution of coupled electron-ion transfer. Our findings open perspectives of potential technological importance involving nanocrystal-based device-like behaviour. © 2009 Elsevier Ltd. All rights reserved.
AB - We report, for the first time, symmetric (versus cluster potential of zero charge) charging of narrowly dispersed monolayer-protected Au 145 cluster films in a room temperature ionic liquid. Near-reversible voltammetric features are found, indicating up to nine electrochemically accessible charge states with assigned values between -4 and +5. The zero charge state has a stability range of 276 mV, very similar as found in solution-phase voltammetry. All other charge states are more narrowly spaced, indicating a sudden increase in cluster capacitance. We ascribe this effect to an abrupt change in local dielectric constant on insertion of one or more counter ions, following departure from zero charge, with a possible contribution of coupled electron-ion transfer. Our findings open perspectives of potential technological importance involving nanocrystal-based device-like behaviour. © 2009 Elsevier Ltd. All rights reserved.
KW - Drop-cast films
KW - Gold clusters
KW - Ionic liquids
KW - Nanoparticles
KW - Quantised charging
KW - A-stability
KW - Abrupt change
KW - Charge state
KW - Cluster films
KW - Counterion
KW - Double layer charging
KW - Electron ions
KW - Local dielectric constant
KW - Monolayer protected clusters
KW - Potential of zero charge
KW - Room temperature ionic liquids
KW - Voltammetric
KW - Zero charge
KW - Drops
KW - Gold compounds
KW - Ionization of liquids
KW - Ions
KW - Monolayers
U2 - 10.1016/j.electacta.2009.02.051
DO - 10.1016/j.electacta.2009.02.051
M3 - Journal article
VL - 54
SP - 5006
EP - 5010
JO - Electrochimica Acta
JF - Electrochimica Acta
SN - 0013-4686
IS - 22
ER -