An STM Study of Chemically Deposited Silver Nanoclusters on Mixed Self-Assembled Monolayers

Abstract

15 % denaturing polyacrylamide gel. The ApA hydrolysis by the 2:1 Zn II ± TPBA complex was followed by reverse-phase HPLC. The 2',3'-cyclic monophosphate of adenosine as the intermediate was rapidly hydrolyzed to the 2'-and 3'-monophosphates; thus, not much intermediate accumulated.

Preparation of High Quality Electrical Insulator Self-Assembled Monolayers on Gold. Experimental Investigation of the Conduction Mechanism through Organic Thin Films

“…A relatively simple method for the generation of a junction 〈gold-SAM-metal〉 is to use an STM tip as the counter electrode of an alkanethiol SAM on gold. , This conductivity system was applied to mixed layers from alkanethiols and long-chain conjugated π-systems (e.g., oligophenylethinyl derivatives). From STM imaging an electron transfer from the gold surface to the STM tip via the conjugated π-systems was proposed. 6a,b,h,7e …”

“…Besides the direct application of the STM tip as counter electrode also 〈gold-SAM-metal cluster-STM tip〉 junctions were intensively investigated with respect to the electrical properties of SAMs . So, for example, nanometer-sized gold clusters have been deposited from a cluster beam onto thiol terminated SAMs. 7a,b The deposition of metal clusters on SAMs can, however, also be performed by chemical reduction of metal salts 7c or by electrodeposition .…”

Functionalized Self-Assembled Alkanethiol Monolayers on Au(111) Electrodes: 2. Silver Electrodeposition

“…Metal was deposited onto functionalized alkanethiol SAMs from the vapor phase, − but in many cases the metal−endgroup interaction is weak and considerable amounts of the deposit penetrate the organic thin film, leading to short circuits. , Electroless metal deposition from solution was more successful. Strong chemical interactions between an acceptor endgroup and the metal salt can lead to deposition onto the SAM, but the salt has to be chemically reduced in a second step. − Deposition driven by an externally applied electrode potential, commonly referred to as electrodeposition, seems to be the most appropriate technique, because the amount of the deposit and the kinetics of the deposition (and dissolution) process can be largely controlled.…”

“…Strong chemical interactions between an acceptor endgroup and the metal salt can lead to deposition onto the SAM, but the salt has to be chemically reduced in a second step. [35][36][37][38] Deposition driven by an externally applied electrode potential, commonly referred to as electrodeposition, seems to be the most appropriate technique, because the amount of the deposit and the kinetics of the deposition (and dissolution) process can be largely controlled. Several reports on electrodeposition onto alkanthiol SAMs have been published, [39][40][41][42][43] and in some cases in situ probe microscopy has been employed to follow the deposition process.…”

Synthesis and metal coordination of thioether containing cyclo- and poly(organophosphazenes)

“…Polymers that form very stable coordination complexes with metal ions are not useful as ion exchangers or extraction materials because the metals cannot easily be removed from the polymer substrate. However, stable macromolecular coordination compounds have been used as polymeric substrates for heterogeneous and homogeneous catalysis,8–13 and as nucleation sites for inorganic crystals and metal nanoclusters,13–15 and strong coordination could be important in adhesion.…”