In−Plane Resistivity of Ultrathin Gold Films:  A High Sensitivity, Molecularly Differentiated Probe of Mercaptan Chemisorption at the Liquid−Metal Interface

Effect of the Interfacial Chemical Environment on In-Plane Electronic Conduction of Indium Tin Oxide: Role of Surface Charge, Dipole Magnitude, and Carrier Injection

“…44,45 In this report, changes in in-plane conductance of thin ITO films (d ∼ 15-30 nm) are measured as a function of changing the chemical environment at the interface. The experimental approach is similar to previous work by Zhang et al 46,47 which demonstrated that molecular adsorption at the metal-liquid interface produces changes in the in-plane conductance properties of thin Au films, which can be used to follow surface phenomena at levels as low as Γ ∼ 10 -5 monolayer. Although the experimental approach is similar, the mechanism by which conductance changes are communicated from interfacial phenomena is completely different at the ITO-solution interface than at the Au-solution interface.…”

“…The portion of this cycle starting at O 3 exposure and ending with thiol exposure is shown in Figure 8b. A large decrease in resistance is observed upon DDT assembly; however, the time to reach a saturation signal is much longer on ITO than for the corresponding experiments on Au, 47 and of course, saturation coverage can be reached with micromolar concentrations from EtOH solution.…”

Preparation and characterization of DNA films using oleylamine modified Au surfaces

“…As reported previously, the adsorption of n-alkanethiols on Au has been described to occur in two different steps [34,35]: a first and fast Langmuir type adsorption [36] which is usually followed by much slower film reorganization processes at high coverage [34,35,[37][38][39][40] that have been associated to nonspecific adsorption, conformational differences or configurational changes, the presence of two or more populations of binding sites, or steric hindrance and diffusion either in the surface or through the molecular layer [30]. Additionally, the transition from the low coverage striped phases to the standing up configurations has been pointed as the significant kinetic bottleneck of such mechanism [35].…”

Gold nanoparticle wire and integrated wire array for electronic detection of chemical and biological molecules

“…Because of the high surface to volume ratio, the resistance increase of our gold nanoparticle wire is about ten times larger than what obtained on thiol modified gold thin film. 30 Furthermore, this increase is about 3 times larger than what discovered on the porous gold nanowire made by an in situ etching with the same ODT concentration. 31 As shown in Fig.…”