Masahiko Hara - Profile on Academia.edu (original) (raw)

Papers by Masahiko Hara

21aHA-2 Molecular Zippers

Meeting Abstracts of the Physical Society of Japan (Nihon Butsuri Gakkai koen gaiyoshu), 2011

Fixation of protein molecules for STM measurement

New deposition technique, ``guest-host anchoring method'', has been developed for scann... more New deposition technique, ``guest-host anchoring method'', has been developed for scanning tunneling microscopy (STM) visualization of biological macromolecules with clear discrimination against artifacts. The electroactive protein (cytochrome c3) molecules were embedded in the liquid crystal matrix, and imaged by STM as a function of applied voltage. Those STM images are encouraging for potential application of this new method to the STM imagings of a wide range of uncoated biological macromolecules.

Langmuir, 2010

The formation and surface structure of pentafluorobenzenethiol (PFBT) self-assembled monolayers (... more The formation and surface structure of pentafluorobenzenethiol (PFBT) self-assembled monolayers (SAMs) on Au(111) formed under various experimental conditions were examined by means of scanning tunneling microscopy (STM). Although it is well known that PFBT molecules on metal surfaces do not form ordered SAMs, we clearly revealed for the first time that the adsorption of PFBT on Au(111) at 75 °C for 2 h yields long-range, well-ordered selfassembled monolayers having a (2 Â 5 √ 13)R30°superlattice. Our results will provide new insight into controlling the structural order of PFBT SAMs, which will be very useful in precisely tailoring the interface properties of metal surfaces in electronic devices.

Intense Fluorescence from Light-Driven Self-Assembled Aggregates of Nonionic Azobenzene Derivative

Journal of The American Chemical Society, 2005

We describe here the highly fluorescent self-assembled spherical aggregates of an azobenzene mole... more We describe here the highly fluorescent self-assembled spherical aggregates of an azobenzene molecule without a specific ionic component in organic solution under UV light illumination. The first stage of trans-to-cis photoisomerization by UV light at 365 nm was followed by a significant enhancement, up to about 1000 times, of the emission from an azobenzene molecule (CN2Azo) with a long alkyl chain, which is due to the spontaneous formation of spherical organic aggregates. Fluorescence emission was further enhanced in the dark, and the quantum yield increased to about 0.3. We also report the significant size and structural changes of the aggregates, from nanometer-scale micelle-like aggregates to micrometer-scale vesicular aggregates, obtained only from the variation in the concentration of an azobenzene derivative. The light-driven azobenzene aggregates show the size and structure dependences of emission wavelength from violet-blue to green-yellow.

International Journal of …, 2009

Here we demonstrate a computing system employing an amoeba of a true slime mold Physarum known as... more Here we demonstrate a computing system employing an amoeba of a true slime mold Physarum known as a model organism for studying cellular information processing. The system works as a neurocomputer that exhibits high optimization capability in solving various problems including the traveling salesman problem. Additionally, we present a new technique that we call "autonomous meta-problem solving." In this approach, our system not only can solve a given problem but also can find new problems and then determine solutions by exploiting the amoeba's unique searching ability and spontaneous behavior.

Langmuir, 2013

Biologically inspired computing devices and architectures are expected to overcome the limitation... more Biologically inspired computing devices and architectures are expected to overcome the limitations of conventional technologies in terms of solving computationally demanding problems, adapting to complex environments, reducing energy consumption, and so on. We previously demonstrated that a primitive single-celled amoeba (a plasmodial slime mold), which exhibits complex spatiotemporal oscillatory dynamics and sophisticated computing capabilities, can be used to search for a solution to a very hard combinatorial optimization problem. We successfully extracted the essential spatiotemporal dynamics by which the amoeba solves the problem. This amoeba-inspired computing paradigm can be implemented by various physical systems that exhibit suitable spatiotemporal dynamics resembling the amoeba's problem-solving process. In this Article, we demonstrate that photoexcitation transfer phenomena in certain quantum nanostructures mediated by optical near-field interactions generate the amoebalike spatiotemporal dynamics and can be used to solve the satisfiability problem (SAT), which is the problem of judging whether a given logical proposition (a Boolean formula) is self-consistent. SAT is related to diverse application problems in artificial intelligence, information security, and bioinformatics and is a crucially important nondeterministic polynomial time (NP)-complete problem, which is believed to become intractable for conventional digital computers when the problem size increases. We show that our amoeba-inspired computing paradigm dramatically outperforms a conventional stochastic search method. These results indicate the potential for developing highly versatile nanoarchitectonic computers that realize powerful solution searching with low energy consumption.

International journal of molecular sciences, Jan 25, 2018

The interaction strength of progressively longer oligomers of glycine, (Gly), di-Gly, tri-Gly, an... more The interaction strength of progressively longer oligomers of glycine, (Gly), di-Gly, tri-Gly, and penta-Gly, with a natural pyrite surface was directly measured using the force mode of an atomic force microscope (AFM). In recent years, selective activation of abiotically formed amino acids on mineral surfaces, especially that of pyrite, has been proposed as an important step in many origins of life scenarios. To investigate such notions, we used AFM-based force measurements to probe possible non-covalent interactions between pyrite and amino acids, starting from the simplest amino acid, Gly. Although Gly itself interacted with the pyrite surface only weakly, progressively larger unbinding forces and binding frequencies were obtained using oligomers from di-Gly to penta-Gly. In addition to an expected increase of the configurational entropy and size-dependent van der Waals force, the increasing number of polar peptide bonds, among others, may be responsible for this observation. The...

Bulletin of the Korean Chemical Society

Self-assembled monolayers (SAMs) were formed by adsorption of thioacetyl-terminated tolanethioace... more Self-assembled monolayers (SAMs) were formed by adsorption of thioacetyl-terminated tolanethioacetate (TTA) on Au(111) in a 0.5-mM ethanol solution after one day immersion at room temperature. Molecular-scale STM imaging revealed that the TTA SAMs were composed of two mixed phases; an ordered phase with small domains describing a ( × 2 )R30° structure and a disordered phase. Interestingly, after annealing the precovered TTA SAMs on Au(111) at 90 °C for 1 h, the small ordered domains grew unidirectionally, resulting in the formation of unique rod-like domains, which were assigned a ( × 2 )R7° structure. These results will be very useful in understanding the formation and thermal behavior of TTA SAMs on gold surfaces.

Bulletin of the Korean Chemical Society

Surface potential and growth processes of hexadecanethiol (HDT) self-assembled monolayers (SAMs) ... more Surface potential and growth processes of hexadecanethiol (HDT) self-assembled monolayers (SAMs) on Au(111) surfaces were examined by Kelvin probe method and scanning tunneling microscopy. It was found that surface potential strongly depends on surface structure of HDT SAMs. The surface potential shift for the striped phase of HDT SAMs chemisorbed on Au(111) surface was +0.45 eV, which was nearly the same as that of the flat-lying hexadecane layer physisorbed on Au(111) surface. This result indicates that the interfacial dipole layer induced by adsorption of alkyl chains is a main contributor to the surface potential change. In the densely-packed HDT monolayer, further change of the surface potential was observed, suggesting that the dipole moment of the alkanethiol molecules is an origin of the surface potential change. These results indicate that the work function of a metal electrode can be modified by controlling the molecular orientation of an adsorbed molecule.

Bulletin of the Korean Chemical Society

The surface structures, adsorption conditions, and thermal desorption behaviors of cyclopentaneth... more The surface structures, adsorption conditions, and thermal desorption behaviors of cyclopentanethiol (CPT) self-assembled monolayers (SAMs) on Au(111) were investigated by scanning tunneling microscopy (STM), X-ray photoelectron spectroscopy (XPS), and thermal desorption spectroscopy (TDS). STM imaging revealed that although the adsorption of CPT on Au(111) at room temperature generates disordered SAMs, CPT molecules at 50 °C formed well-ordered SAMs with a (2√3 × √5)R41 o packing structure. XPS measurements showed that CPT SAMs at room temperature were formed via chemical reactions between the sulfur atoms and gold surfaces. TDS measurements showed two dominant TD peaks for the decomposed fragments (C 5 H 9 + , m/e = 69) generated via C-S bond cleavage and the parent molecular species (C 5 H 9 SH + , m/e = 102) derived from a recombination of the chemisorbed thiolates and hydrogen atoms near 440 K. Interestingly, dimerization of sulfur atoms in n-alkanethiol SAMs usually occurs during thermal desorption and the same reaction did not happen for CPT SAMs, which may be due to the steric hindrance of cyclic rings of the CPT molecules. In this study, we demonstrated that the alicyclic ring of organic thiols strongly affected the surface structure and thermal desorption behavior of SAMs, thus providing a good method for controlling chemical and physical properties of organic thiol SAMs.

Bulletin of the Korean Chemical Society

Laser Scanning-Assisted Tip-Enhanced Optical Microscopy for Robust Optical Nanospectroscopy

Applied spectroscopy, Jul 1, 2016

Laser-scanning-assisted tip-enhanced optical microscopy was developed for robust optical nanospec... more Laser-scanning-assisted tip-enhanced optical microscopy was developed for robust optical nanospectroscopy. The laser-scanning system was utilized to automatically set and keep the center of a tight laser-focusing spot in the proximity of a metallic tip with around 10 nm precision. This enabled us to efficiently and stably induce plasmon-coupled field enhancement at the apex of the metallic probe tip. The laser-scanning technique was also applied to tracking and compensating the thermal drift of the metallic tip in the spot. This technique is usable for long-term tip-enhanced optical spectroscopy without any optical degradation.

Immobilization of molecular tubes on self-assembled monolayers of beta-cyclodextrin and dodecanethiol inclusion complexes

Appl Phys Lett, 2004

Hybridization of Polynucleotides Using Self-Assembled Monolayer Containing Pyrenyl Groups

Molecular Crystals and Liquid Crystals Science and Technology Section a Molecular Crystals and Liquid Crystals, 2002

To realize an efficient hybridization of polynucleotides, self-assembled monolayer (SAM) containi... more To realize an efficient hybridization of polynucleotides, self-assembled monolayer (SAM) containing pyrene groups was prepared on a gold substrate because pyrene molecules have an affinity for nucleic acid bases through van der Waals interaction. The SAM was prepared from 11-(1-pyrene)-1-undeacathiol and 11-mercapto-1-undecanol mixed solution. The mixed SAM gave an efficient hybridization of polyadenylic acid and polyuridylic acid observed by surface plasmon resonance.

Japanese Journal of Applied Physics, Jul 1, 2005

Atomic force microscopy (AFM) was employed to probe the interaction between recombinant ferritin ... more Atomic force microscopy (AFM) was employed to probe the interaction between recombinant ferritin molecules immobilized on an AFM tip and surface-modified silicon substrates. Force-distance curve profiles demonstrated for the first time the controllability of long-ranged ferritin-substrate interactions and the amount of ferritin molecules adsorbed on a substrate by modifying the amino acid sequence in the N-terminal domains. In addition, we proposed that the decoration of substrate surface with self-assembled monolayers (SAMs) also helped in controlling the ferritin-substrate interaction and the resulting adsorption amount. Our important finding is that the amount of ferritin adsorbed cannot be predicted simply from the zeta potentials of a ferritin molecule and substrate, and that the flexibility of the surface polar groups on a Si substrate is an important factor that governs the amount of the adsorption. Based on the analysis of force-distance profiles, we discuss what kind of force dominates the long-ranged and short-ranged interactions between ferritin and silicon substrates. These provide insights and lead to a deeper understanding of the factors to govern the adsorption of ferritins onto solid substrates.

Nanorheology measurement on a single polymer chain

Applied Physics Letters, Jul 21, 2002

The mechanical properties of a single chain of a synthesized polystyrene were measured by atomic ... more The mechanical properties of a single chain of a synthesized polystyrene were measured by atomic force microscopy (AFM). In the conventional force-distance curve measurement, the stress-strain behavior of a chain was obtained. We also measured the dynamic sinusoidal ...

ChemInform Abstract: Selective Aerobic Oxidation of Methanol in the Coexistence of Amines by Nanoporous Gold Catalysts: Highly Efficient Synthesis of Formamides

Cheminform, Jan 28, 2014

Scanning Tunneling Microscopy Investigations on Heteroepitaxially Grown Overlayers of Cu-Phthalocyanine on Au(111) Surfaces

Origin of Current Enhancement through a Ferrocenylundecanethiol Island Embedded in Alkanethiol SAMs by Using Electrochemical Potential Control

The Journal of Physical Chemistry C, May 9, 2007

Electroactive ferrocenylundecanethiol islands embedded in an n-decanethiol SAM matrix were studie... more Electroactive ferrocenylundecanethiol islands embedded in an n-decanethiol SAM matrix were studied under potential control using in situ scanning tunneling microscopy (STM). Contrary to previous reports, the positive charges on ferrocene moieties are not a ...

21aHA-2 Molecular Zippers

Meeting Abstracts of the Physical Society of Japan (Nihon Butsuri Gakkai koen gaiyoshu), 2011

Fixation of protein molecules for STM measurement

New deposition technique, ``guest-host anchoring method'', has been developed for scann... more New deposition technique, ``guest-host anchoring method'', has been developed for scanning tunneling microscopy (STM) visualization of biological macromolecules with clear discrimination against artifacts. The electroactive protein (cytochrome c3) molecules were embedded in the liquid crystal matrix, and imaged by STM as a function of applied voltage. Those STM images are encouraging for potential application of this new method to the STM imagings of a wide range of uncoated biological macromolecules.

Langmuir, 2010

The formation and surface structure of pentafluorobenzenethiol (PFBT) self-assembled monolayers (... more The formation and surface structure of pentafluorobenzenethiol (PFBT) self-assembled monolayers (SAMs) on Au(111) formed under various experimental conditions were examined by means of scanning tunneling microscopy (STM). Although it is well known that PFBT molecules on metal surfaces do not form ordered SAMs, we clearly revealed for the first time that the adsorption of PFBT on Au(111) at 75 °C for 2 h yields long-range, well-ordered selfassembled monolayers having a (2 Â 5 √ 13)R30°superlattice. Our results will provide new insight into controlling the structural order of PFBT SAMs, which will be very useful in precisely tailoring the interface properties of metal surfaces in electronic devices.

Intense Fluorescence from Light-Driven Self-Assembled Aggregates of Nonionic Azobenzene Derivative

Journal of The American Chemical Society, 2005

We describe here the highly fluorescent self-assembled spherical aggregates of an azobenzene mole... more We describe here the highly fluorescent self-assembled spherical aggregates of an azobenzene molecule without a specific ionic component in organic solution under UV light illumination. The first stage of trans-to-cis photoisomerization by UV light at 365 nm was followed by a significant enhancement, up to about 1000 times, of the emission from an azobenzene molecule (CN2Azo) with a long alkyl chain, which is due to the spontaneous formation of spherical organic aggregates. Fluorescence emission was further enhanced in the dark, and the quantum yield increased to about 0.3. We also report the significant size and structural changes of the aggregates, from nanometer-scale micelle-like aggregates to micrometer-scale vesicular aggregates, obtained only from the variation in the concentration of an azobenzene derivative. The light-driven azobenzene aggregates show the size and structure dependences of emission wavelength from violet-blue to green-yellow.

International Journal of …, 2009

Here we demonstrate a computing system employing an amoeba of a true slime mold Physarum known as... more Here we demonstrate a computing system employing an amoeba of a true slime mold Physarum known as a model organism for studying cellular information processing. The system works as a neurocomputer that exhibits high optimization capability in solving various problems including the traveling salesman problem. Additionally, we present a new technique that we call "autonomous meta-problem solving." In this approach, our system not only can solve a given problem but also can find new problems and then determine solutions by exploiting the amoeba's unique searching ability and spontaneous behavior.

Langmuir, 2013

Biologically inspired computing devices and architectures are expected to overcome the limitation... more Biologically inspired computing devices and architectures are expected to overcome the limitations of conventional technologies in terms of solving computationally demanding problems, adapting to complex environments, reducing energy consumption, and so on. We previously demonstrated that a primitive single-celled amoeba (a plasmodial slime mold), which exhibits complex spatiotemporal oscillatory dynamics and sophisticated computing capabilities, can be used to search for a solution to a very hard combinatorial optimization problem. We successfully extracted the essential spatiotemporal dynamics by which the amoeba solves the problem. This amoeba-inspired computing paradigm can be implemented by various physical systems that exhibit suitable spatiotemporal dynamics resembling the amoeba's problem-solving process. In this Article, we demonstrate that photoexcitation transfer phenomena in certain quantum nanostructures mediated by optical near-field interactions generate the amoebalike spatiotemporal dynamics and can be used to solve the satisfiability problem (SAT), which is the problem of judging whether a given logical proposition (a Boolean formula) is self-consistent. SAT is related to diverse application problems in artificial intelligence, information security, and bioinformatics and is a crucially important nondeterministic polynomial time (NP)-complete problem, which is believed to become intractable for conventional digital computers when the problem size increases. We show that our amoeba-inspired computing paradigm dramatically outperforms a conventional stochastic search method. These results indicate the potential for developing highly versatile nanoarchitectonic computers that realize powerful solution searching with low energy consumption.

International journal of molecular sciences, Jan 25, 2018

The interaction strength of progressively longer oligomers of glycine, (Gly), di-Gly, tri-Gly, an... more The interaction strength of progressively longer oligomers of glycine, (Gly), di-Gly, tri-Gly, and penta-Gly, with a natural pyrite surface was directly measured using the force mode of an atomic force microscope (AFM). In recent years, selective activation of abiotically formed amino acids on mineral surfaces, especially that of pyrite, has been proposed as an important step in many origins of life scenarios. To investigate such notions, we used AFM-based force measurements to probe possible non-covalent interactions between pyrite and amino acids, starting from the simplest amino acid, Gly. Although Gly itself interacted with the pyrite surface only weakly, progressively larger unbinding forces and binding frequencies were obtained using oligomers from di-Gly to penta-Gly. In addition to an expected increase of the configurational entropy and size-dependent van der Waals force, the increasing number of polar peptide bonds, among others, may be responsible for this observation. The...

Bulletin of the Korean Chemical Society

Self-assembled monolayers (SAMs) were formed by adsorption of thioacetyl-terminated tolanethioace... more Self-assembled monolayers (SAMs) were formed by adsorption of thioacetyl-terminated tolanethioacetate (TTA) on Au(111) in a 0.5-mM ethanol solution after one day immersion at room temperature. Molecular-scale STM imaging revealed that the TTA SAMs were composed of two mixed phases; an ordered phase with small domains describing a ( × 2 )R30° structure and a disordered phase. Interestingly, after annealing the precovered TTA SAMs on Au(111) at 90 °C for 1 h, the small ordered domains grew unidirectionally, resulting in the formation of unique rod-like domains, which were assigned a ( × 2 )R7° structure. These results will be very useful in understanding the formation and thermal behavior of TTA SAMs on gold surfaces.

Bulletin of the Korean Chemical Society

Surface potential and growth processes of hexadecanethiol (HDT) self-assembled monolayers (SAMs) ... more Surface potential and growth processes of hexadecanethiol (HDT) self-assembled monolayers (SAMs) on Au(111) surfaces were examined by Kelvin probe method and scanning tunneling microscopy. It was found that surface potential strongly depends on surface structure of HDT SAMs. The surface potential shift for the striped phase of HDT SAMs chemisorbed on Au(111) surface was +0.45 eV, which was nearly the same as that of the flat-lying hexadecane layer physisorbed on Au(111) surface. This result indicates that the interfacial dipole layer induced by adsorption of alkyl chains is a main contributor to the surface potential change. In the densely-packed HDT monolayer, further change of the surface potential was observed, suggesting that the dipole moment of the alkanethiol molecules is an origin of the surface potential change. These results indicate that the work function of a metal electrode can be modified by controlling the molecular orientation of an adsorbed molecule.

Bulletin of the Korean Chemical Society

The surface structures, adsorption conditions, and thermal desorption behaviors of cyclopentaneth... more The surface structures, adsorption conditions, and thermal desorption behaviors of cyclopentanethiol (CPT) self-assembled monolayers (SAMs) on Au(111) were investigated by scanning tunneling microscopy (STM), X-ray photoelectron spectroscopy (XPS), and thermal desorption spectroscopy (TDS). STM imaging revealed that although the adsorption of CPT on Au(111) at room temperature generates disordered SAMs, CPT molecules at 50 °C formed well-ordered SAMs with a (2√3 × √5)R41 o packing structure. XPS measurements showed that CPT SAMs at room temperature were formed via chemical reactions between the sulfur atoms and gold surfaces. TDS measurements showed two dominant TD peaks for the decomposed fragments (C 5 H 9 + , m/e = 69) generated via C-S bond cleavage and the parent molecular species (C 5 H 9 SH + , m/e = 102) derived from a recombination of the chemisorbed thiolates and hydrogen atoms near 440 K. Interestingly, dimerization of sulfur atoms in n-alkanethiol SAMs usually occurs during thermal desorption and the same reaction did not happen for CPT SAMs, which may be due to the steric hindrance of cyclic rings of the CPT molecules. In this study, we demonstrated that the alicyclic ring of organic thiols strongly affected the surface structure and thermal desorption behavior of SAMs, thus providing a good method for controlling chemical and physical properties of organic thiol SAMs.

Bulletin of the Korean Chemical Society

Laser Scanning-Assisted Tip-Enhanced Optical Microscopy for Robust Optical Nanospectroscopy

Applied spectroscopy, Jul 1, 2016

Laser-scanning-assisted tip-enhanced optical microscopy was developed for robust optical nanospec... more Laser-scanning-assisted tip-enhanced optical microscopy was developed for robust optical nanospectroscopy. The laser-scanning system was utilized to automatically set and keep the center of a tight laser-focusing spot in the proximity of a metallic tip with around 10 nm precision. This enabled us to efficiently and stably induce plasmon-coupled field enhancement at the apex of the metallic probe tip. The laser-scanning technique was also applied to tracking and compensating the thermal drift of the metallic tip in the spot. This technique is usable for long-term tip-enhanced optical spectroscopy without any optical degradation.

Immobilization of molecular tubes on self-assembled monolayers of beta-cyclodextrin and dodecanethiol inclusion complexes

Appl Phys Lett, 2004

Hybridization of Polynucleotides Using Self-Assembled Monolayer Containing Pyrenyl Groups

Molecular Crystals and Liquid Crystals Science and Technology Section a Molecular Crystals and Liquid Crystals, 2002

To realize an efficient hybridization of polynucleotides, self-assembled monolayer (SAM) containi... more To realize an efficient hybridization of polynucleotides, self-assembled monolayer (SAM) containing pyrene groups was prepared on a gold substrate because pyrene molecules have an affinity for nucleic acid bases through van der Waals interaction. The SAM was prepared from 11-(1-pyrene)-1-undeacathiol and 11-mercapto-1-undecanol mixed solution. The mixed SAM gave an efficient hybridization of polyadenylic acid and polyuridylic acid observed by surface plasmon resonance.

Japanese Journal of Applied Physics, Jul 1, 2005

Atomic force microscopy (AFM) was employed to probe the interaction between recombinant ferritin ... more Atomic force microscopy (AFM) was employed to probe the interaction between recombinant ferritin molecules immobilized on an AFM tip and surface-modified silicon substrates. Force-distance curve profiles demonstrated for the first time the controllability of long-ranged ferritin-substrate interactions and the amount of ferritin molecules adsorbed on a substrate by modifying the amino acid sequence in the N-terminal domains. In addition, we proposed that the decoration of substrate surface with self-assembled monolayers (SAMs) also helped in controlling the ferritin-substrate interaction and the resulting adsorption amount. Our important finding is that the amount of ferritin adsorbed cannot be predicted simply from the zeta potentials of a ferritin molecule and substrate, and that the flexibility of the surface polar groups on a Si substrate is an important factor that governs the amount of the adsorption. Based on the analysis of force-distance profiles, we discuss what kind of force dominates the long-ranged and short-ranged interactions between ferritin and silicon substrates. These provide insights and lead to a deeper understanding of the factors to govern the adsorption of ferritins onto solid substrates.

Nanorheology measurement on a single polymer chain

Applied Physics Letters, Jul 21, 2002

The mechanical properties of a single chain of a synthesized polystyrene were measured by atomic ... more The mechanical properties of a single chain of a synthesized polystyrene were measured by atomic force microscopy (AFM). In the conventional force-distance curve measurement, the stress-strain behavior of a chain was obtained. We also measured the dynamic sinusoidal ...

ChemInform Abstract: Selective Aerobic Oxidation of Methanol in the Coexistence of Amines by Nanoporous Gold Catalysts: Highly Efficient Synthesis of Formamides

Cheminform, Jan 28, 2014

Scanning Tunneling Microscopy Investigations on Heteroepitaxially Grown Overlayers of Cu-Phthalocyanine on Au(111) Surfaces

Origin of Current Enhancement through a Ferrocenylundecanethiol Island Embedded in Alkanethiol SAMs by Using Electrochemical Potential Control

The Journal of Physical Chemistry C, May 9, 2007

Electroactive ferrocenylundecanethiol islands embedded in an n-decanethiol SAM matrix were studie... more Electroactive ferrocenylundecanethiol islands embedded in an n-decanethiol SAM matrix were studied under potential control using in situ scanning tunneling microscopy (STM). Contrary to previous reports, the positive charges on ferrocene moieties are not a ...