Electrostatic investigation into the bonding of poly(phenylene) thiols to gold

McNally, Helen; Janes, David B.; Kasibhatla, B.; Kubiak, Clifford P.

doi:10.1006/spmi.2002.1027

Cited by 26 publications

(19 citation statements)

References 18 publications

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“…Due to this reason, a negative change in the surface potential distribution between the uncovered and the SAM-covered gold was observed. [72] For aromatic molecules, the delocalization of the electron cloud is higher than in alkanethiols, and thus the decrease in surface potential, proportional to the molecule length, saturates and reaches a fixed value already when three aromatic rings are attached to gold. The surface potential difference between two different SAMs can be calculated with a good approximation from the molecular dipoles of different molecules (Fig.…”

Section: Kpfm On Organic Monolayers Supramolecular Systems and Biolmentioning

confidence: 99%

Electronic Characterization of Organic Thin Films by Kelvin Probe Force Microscopy

2006

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This review highlights the potential of Kelvin probe force microscopy (KPFM) beyond imaging to simultaneously study structural and electronic properties of functional surfaces and interfaces. This is of paramount importance since it is well established that a solid surface possesses different properties than the bulk material. The versatility of the technique allows one to carry out investigations in a non‐invasive way for different environmental conditions and sample types with resolutions of a few nanometers and some millivolts. KPFM can be used to acquire a wide knowledge of the overall electronic and electrical behavior of a sample surface. Moreover, by KPFM it is possible to study complex electronic phenomena in supramolecular engineered systems and devices. The combination of such a methodology with external stimuli, e.g., light irradiation, opens new doors to the exploration of processes occurring in nature or in artificial complex architectures. Therefore, KPFM is an extremely powerful technique that permits the unraveling of electronic (dynamic) properties of materials, enabling the optimization of the design and performance of new devices based on organic‐semiconductor nanoarchitectures.

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Section: Kpfm On Organic Monolayers Supramolecular Systems and Biolmentioning

confidence: 99%

Electronic Characterization of Organic Thin Films by Kelvin Probe Force Microscopy

2006

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“…However, the number of molecules involved in conduction is uncertain, but apparently quite consistent. The resistance listed in Table 3 117,121,122,131,146,148 A dithiol molecule adsorbed conventionally on a Au surface has pendent SH groups which can react with Au nanoparticles. The particle/molecule/substrate assembly is a nearly symmetric molecular junction which may be interrogated with an STM or CP-AFM probe.…”

Section: Scanning Probe Microscopy (Spm)mentioning

confidence: 99%

Molecular Electronic Junctions

2004

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A review with 228 references on experimental investigation of conductor/molecule/metal molecular electronic junctions is presented. Devices based on covalent and LangmuirBlodgett bonding of single molecules or molecular monolayers to conducting substrates are reviewed, as characterized by scanning probe microscopy and microelectronic techniques. Phenomena observed to date include molecular rectification, conductance switching, and nonlinear current/voltage behavior. Prospects and problems for the application of molecular junctions to the more general area of molecular electronics are discussed.

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“…Usually, the anchoring of gold nanoparticles on the solid substrates is carried out by using an intermediate layer of organic molecules grafted on the solid surface, whose terminal functional groups are selected for their electrostatic or chemical interactions with the nanoparticles [11][12][13][14][15][16]. These platforms should also be stable over time and the interaction of the nanoparticles with the surface should be strong enough to ensure that the nanoparticles remains attached to the surface during further functionalization and upon utilization.…”

Section: Introductionmentioning

confidence: 99%

Optimizing the immobilization of gold nanoparticles on functionalized silicon surfaces: amine- vs thiol-terminated silane

et al. 2013

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Immobilization of gold nanoparticles on planar surfaces is of great interest to many scientific communities; chemists, physicists, biologists, and the various communities working at the interfaces between these disciplines. Controlling the immobilization step, especially nanoparticles dispersion and coverage, is an important issue for all of these communities. We studied the parameters that can influence this interaction, starting with the nature of the terminal chemical function. Thus, we have carefully grafted silanes terminated by either amine or thiol groups starting from aminopropyltriethoxysilane (APTES) or mercaptopropyltriethoxysilane. We also changed the chain length for thiol-terminated layers through covalent grafting of mercaptoundecanoic acid (MUA) on APTESmodified layers, and the protocol of nanoparticles deposition to evaluate whether other factors must be taken into consideration to rationalize this interaction. The formed layers were characterized by X-ray photoelectron spectroscopy and gold nanoparticles deposition was monitored by scanning electron microscopy and surface-enhanced Raman scattering. We observed significant differences in terms of nanoparticles dispersion and density depending on the nature of the chemical layer on silicon. The use of ultrasounds during the deposition process was very efficient to limit aggregates formation. The optimal deposition procedures were obtained through the use of APTES and APTES/MUA functionalization. They were compared in terms of coverage, dispersion, and densities of isolated nanoparticles. The APTES/MUA surfaces clearly showed better results that may arise from both the longer chain and the dilution of thiol end groups.

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Electrostatic investigation into the bonding of poly(phenylene) thiols to gold

Cited by 26 publications

References 18 publications

Electronic Characterization of Organic Thin Films by Kelvin Probe Force Microscopy

Electronic Characterization of Organic Thin Films by Kelvin Probe Force Microscopy

Molecular Electronic Junctions

Optimizing the immobilization of gold nanoparticles on functionalized silicon surfaces: amine- vs thiol-terminated silane

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