Publications by Year: 2011

Danieli T, Colleran J, Mandler D. Deposition of Au and Ag nanoparticles on PEDOT. Phys. Chem. Chem. Phys.Physical Chemistry Chemical Physics. 2011;13 (45) :20345 - 20353.Abstract
The deposition of Au and Ag, locally and from bulk soln., on poly(3,4-ethylenedioxythiophene) (PEDOT) was studied. Specifically, PEDOT was electrochem. polymd. onto a glassy carbon (GC) electrode and used for bulk deposition of Au and Ag from their resp. ions dissolved in the soln. as well as for the local deposition of these metals using scanning electrochem. microscopy (SECM). These two sets of expts. were utilized to investigate the difference between Au and Ag electrochem. deposition on PEDOT. In particular, SECM expts., which were conducted by the controlled anodic dissoln. of Au and Ag microelectrodes close to GC/PEDOT, probed the effect of different PEDOT oxidn. states on local deposition. The current-time transients recorded during the deposition, combined with SEM and energy-dispersive x-ray anal. provided insight into the redn. processes. AuCl4- and Ag+ ions were electrochem. reduced at a potential equal to and more neg. than the ions redox potentials (0.4 and 0.2 V, resp.) and more pos. than -0.7 V, where the PEDOT starts transforming into the reduced, i.e. insulating, state. We found that the electroredn. of Ag+ ions was diffusion-controlled and the PEDOT film served as a simple conductor. The redn. of AuCl4- ions was enhanced on GC/PEDOT as compared with bare GC, indicating that PEDOT catalyzes the redn. of AuCl4- to Au. [on SciFinder(R)]
Guslitzer-Okner R, Mandler D. Electrochemical coating of medical implants. Mod. Aspects Electrochem.Modern Aspects of Electrochemistry. 2011;52 (Applications of Electrochemistry and Nanotechnology in Biology and Medicine I) :291 - 342.Abstract
A review on the various studies of electroplating of medical devices, such as implants, including the different methods of electrochem. deposition and the various substrates electrochem. coated. [on SciFinder(R)]
Ginzburg-Turgeman R, Guion J-B, Mandler D. Improving the adhesion of polymethacrylate thin films onto indium tin oxide electrodes using a silane-based "Molecular Adhesive". J. Solid State Electrochem.Journal of Solid State Electrochemistry. 2011;15 (11-12) :2401 - 2407.Abstract
Indium tin oxide (ITO) is the most commonly used transparent conducting substance. It has been used in numerous applications such as light-emitting diodes. In most applications and studies, the ITO surface is further coated with addnl. layers. The interface between the ITO and the coating is of utmost importance since it affects the phys. and chem. properties of the final device. Improving the adhesion between ITO and a coating layer can be achieved by applying a "mol. adhesive" as an inter-phasing mol. layer. In this study, we used 3-(trimethoxysilyl)propyl methacrylate as a "mol. adhesive" for better connection between ITO and a polymethacrylate layer. The samples were studied by electrochem., contact angle goniometry, at. force microscopy, and nano scratch microscopy. These studies clearly show that a simple silanization process formed a thin mol. adhesive layer, which did not influence the phys. and chem. properties of the final coated electrode and at the same time increased significantly the adhesion between the ITO and the polymethacrylate coating. [on SciFinder(R)]
Hitrik M, Gutkin V, Lev O, Mandler D. Preparation and Characterization of Mono- and Multilayer Films of Polymerizable 1,2-Polybutadiene Using the Langmuir-Blodgett Technique. LangmuirLangmuir. 2011;27 (19) :11889 - 11898.Abstract
The essence of this study is to apply the Langmuir-Blodgett (LB) technique for assembling asym. membranes. Accordingly, Langmuir films of a (further) polymerizable polymer, 1,2-polybutadiene (1,2-pbd), were studied and transferred onto different solid supports, such as Au, In Sn oxide (ITO), and Si. The layers were characterized both at the air/H2O interface as well as on different substrates using numerous methods including cyclic voltammetry, impedance spectroscopy, spectroscopic ellipsometry, at. force microscopy, XPS, and reflection-absorption FTIR spectroscopy. The Langmuir films were stable at the air-H2O interface as long as they were not exposed to UV irradn. The LB films formed disorganized layers, which gradually blocked the permeation of different species with increasing the no. of deposited layers. The thickness was ∼4-7 Å per layer. Irradiating the Langmuir films caused their crosslinking at the air-H2O interface. Also, the authors took advantage of the reactivity of the double bond of the LB films on the solid supports and graft polymd. acrylic acid on top of the 1,2-pbd layers. This approach is the basis of the formation of an asym. membrane that requires different porosity on both of its sides. [on SciFinder(R)]
Kraus-Ophir S, Jerman I, Orel B, Mandler D. Symmetrical thiol functionalized polyhedral oligomeric silsesquioxanes as building blocks for LB films. Soft MatterSoft Matter. 2011;7 (19) :8862 - 8869.Abstract
The Langmuir-Blodgett (LB) method was used for depositing cubic polyhedral oligomeric silsesquioxanes (T8POSS) onto Au, indium tin oxide (ITO) and mica supports. Three different T8POSS were examd.; two were amphiphilic and aggregated upon transfer to a solid support, while the highly sym. POSS (termed MP8) gave stable and reproducible Langmuir films as studied by surface pressure and transfer ratio measurements. This was attributed to the eight identical alkanethiol groups located on each of the eight corners of the cubic like skeleton. The LB films were studied by RA-FTIR, XPS, contact angle and cyclic voltammetry. These techniques revealed the formation of a permeable, yet, stable layer. The sym. MP8 was utilized as a bridging building block between the support and Au nanoparticles (Au-NPs). This assembly was examd. by means of AFM, SEM and anodic oxidn. of the nanoparticles. An av. d. of 1.45 × 109 nanoparticles cm-2 was obtained for the deposited Au-NPs on the MP8 layer. Furthermore, anodic stripping voltammetry was used for studying the extn. of Hg2+ by the MP8 LB film. [on SciFinder(R)]