Self‐Assembly of Semiconducting Photoluminescent Peptide Nanowires in the Vapor Phase

Lee, Joon Seok; Yoon, Ilsun; Kim, Jangbae; Ihee, Hyotcherl; Kim, Bongsoo; Park, Chan Beum

doi:10.1002/anie.201003446

Cited by 97 publications

(81 citation statements)

References 36 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Figure 1C and 1D shows highmagnification images of the samples that highlight their novel morphological features. In contrast to previous studies that reported that the solid-vapor approach led to rodlike structures, 16,24,25 we observed flat micrometric tapes. This finding is a very unique aspect of our system because the flat surface of tapes can facilitate the buildup of analytes onto electrodes.…”

Section: Resultscontrasting

confidence: 99%

“…These solvents exhibit very distinct chemical properties and are known to form different crystallographic symmetries in the resulting assemblies. 15,16,25 To determine these characteristics in our thiol-modified electrodes, we performed a thorough analysis using SEM. In Figure 1, scanning electron micrographs from samples obtained either under water vapor or under aniline vapor are shown.…”

Section: Resultsmentioning

confidence: 99%

“…29 Moreover, as aforementioned, in other contexts, where structures have been grown directly onto the substrate, aniline vapor has led to rodlike structures (e.g., nanowires). 16,24,25 To characterize our structures at the crystallographic level, we performed powder diffraction experiments. Figures 2 and 3 show high-resolution XRD patterns of both water-and anilineincubated samples.…”

Section: Resultsmentioning

confidence: 99%

“…15 Lee et al have suggested that, in the absence of water to stabilize the linear form, carboxyl and amine groups at the dipeptide backbone fuse together (3,6-bis(phenylmethyl)-2,5-piperazinedione), forming cyclo-FF. 16 This structure is compact, with no internal empty space.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

A Nonenzymatic Biosensor Based on Gold Electrodes Modified with Peptide Self-Assemblies for Detecting Ammonia and Urea Oxidation

et al. 2014

View full text Add to dashboard Cite

We have developed a nonenzymatic biosensor for the detection of ammonia and urea oxidation based on the deposition of peptide microstructures onto thiolated gold electrodes. FF-MNSs/MCP/Au assemblies were obtained by modifying gold substrates with 4-mercaptopyridine (MCP), followed by coating with l,l-diphenylalanine micro/nanostructures (FF-MNSs) grown in the solid-vapor phase. Benzene rings and amide groups with peptide micro/nanostructures interact with synthetic NH4(+) receptors through cation-π and hydrogen bonding. AuOH clusters on the Au surface provided the catalytic sites. The application of a predetermined concentration of analytes at the peptide interfaces activated the catalytic sites. We observed a relationship between the stability of films and the crystal structure of peptides, and we organized the FF-MNSs into an orthorhombic symmetry that was the most suitable assembly for creation of our biosensors. At 0.1 mol L(-1) NaOH, these FF-MNSs/MCP/Au electrodes have electrocatalytic properties regarding ammonia and urea oxidation that are comparable to those of enzyme-based architectures. Under optimal conditions, the electrocatalytic response is proportional to the ammonia and urea concentration in the range 0.1-1.0 mmol L(-1). The sensitivity was calculated as 2.83 and 81.3 μA mmol L(-1) cm(-2) for ammonia and urea, respectively, at +0.40 V (vs SCE). Our detection method is easy to follow, does not require a mediator or enzyme, and has strong potential for detecting urea via nonenzymatic routes.

show abstract

Section: Resultscontrasting

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A Nonenzymatic Biosensor Based on Gold Electrodes Modified with Peptide Self-Assemblies for Detecting Ammonia and Urea Oxidation

et al. 2014

View full text Add to dashboard Cite

show abstract

“…[19][20][21] However, when FF is self-assembled under anhydrous conditions, they are frequently described in terms of orthorhombic groups. 5,6,8 Similarly, hydrated FF nanotubes exhibit a hexagonal to orthorhombic phase transition when incubated at temperatures above 140 °C. This phenomenon has been ascribed to the release of water and the change in peptide backbones from a linear conformation to a cyclic one, followed by the reorganization of the crystalline structure in the orthorhombic symmetry group P22121.…”

Section: Introductionmentioning

confidence: 99%

Multifunctional biosensors based on peptide–polyelectrolyte conjugates

Kogikoski

Sousa

Liberato

et al. 2016

Phys. Chem. Chem. Phys.

View full text Add to dashboard Cite

A novel enzymatic platform for the sensing of H2O2 and glucose that uses L,L-diphenylalanine micro/nanostructures (FF-MNSs) as an enzyme support is shown. This platform is obtained by the self-assembly of poly(allylamine hydrochloride) (PAH), FF-MNSs, and microperoxidase-11 (MP11) anchored onto the peptide matrix, in two different crystal structures of FF-MNSs: hexagonal (P61) and orthorhombic (P22121). The electroactive area of the electrodes increases in the presence of FF-MNSs. We also demonstrate via theoretical calculations that the valence band energy of the orthorhombic structure allows it to be doped, similarly to p-type semiconductors, where PAH acts as a doping agent for the orthorhombic peptide structure, decreasing the band-gap by around 1 eV, which results in a smaller charge transfer resistance. These results are consistent with electrochemical impedance spectroscopy measurements, which further elucidate the role of the band structure of the orthorhombic FF-MNSs in the conductivity and electron transfer rates of the hybrid material. An effective communication between the electrode and the active site of a glucose oxidase enzyme through MP11-protein complexes occurs, paving the way for FF-MNSs in the orthorhombic phase for the future development of bioelectronics sensing devices.

show abstract