The performance of negative electron affinity photocathodes

Allen, G A

doi:10.1088/0022-3727/4/2/317

Cited by 25 publications

(3 citation statements)

References 8 publications

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“…Molecular scale simulations provide a straightforward approach for us to understand the fiber structures and self-assembly process. [17] In this work, molecular dynamics simulations using coarse-grained Martini force field [18] in Gromacs [19] were performed to study the self-assembly details of Palm-CR3 under different conditions. It was found that Palm-CR3 self-assembles into cylindrical supramolecularf ibers in water with ad iameter around 8.0 nm, whereas the fiber diameterdecreases to around 7.0 nm in ahigh ionic strength environment( Figure 2b and Ta ble S1).…”

Section: Morphologiesa Nd Internal Cohesion Of Pa Assembly Modulated mentioning

confidence: 99%

Functional Control of Peptide Amphiphile Assemblies via Modulation of Internal Cohesion and Surface Chemistry Switch

Cui

et al. 2018

Chemistry A European J

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Understanding the impacts of the internal cohesion and surface chemistry of supramolecular systems on the collective behaviors in the contacts between the systems and biomolecules can greatly expand the functional diversity and adaptivity of supramolecular nanostructures. Here we show how the tuned molecular interactions modulate the morphologies and internal cohesion of peptide amphiphile (PA) self-assemblies and their resultant functions. Circular dichroism spectroscopy, fluorescence probing, atomic force and electron microscopy, along with molecular dynamics simulations, revealed that the PA self-assembly formed compact long fibers when surface charge repulsion was screened, but formed loose short fibers or micelle-like assemblies when hydrogen bonding was disrupted or hydrophobic core was enhanced. More importantly, depending on the strength of the phospholipid affinity for the cationic segment of the PA, the same internal cohesion of PA nanostructures can lead to either cell death or cell survival, providing unique insights into the design of supramolecular materials.

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Section: Morphologiesa Nd Internal Cohesion Of Pa Assembly Modulated mentioning

confidence: 99%

Functional Control of Peptide Amphiphile Assemblies via Modulation of Internal Cohesion and Surface Chemistry Switch

Cui

et al. 2018

Chemistry A European J

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“…We show below that this interpretation may be made explicit by considering the first-order solution of the Boltzmann transport equation underlying equation (1). The result obtained is used to discuss briefly two problems of current interest; firstly, the magnitude of the recombination velocity at the substrate interface SZ which is an important parameter limiting the performance of transmission photocathodes (Antypas et a1 1970, Allen 1971, Allenson et a1 1972, and secondly, the relationship between the quantum-mechanical transmission probability T for escape of an electron from the surface into vacuum and the empirical 'surface escape probability'…”

Section: (A'n/ax') -( N / ~) = -G(x)mentioning

confidence: 99%

“…A low recombination velocity S2 at the semiconductor-substrate interface is required for the best performance of transmission photocathodes (Antypas et a1 1970, Allen 1971.…”

Section: Interface Recombination In the Transmission Photocathodementioning

confidence: 99%

Interpretation of the surface boundary conditions in the diffusion model for NEA photoemission

Clark¹

1976

J. Phys. D: Appl. Phys.

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By examination of the underlying Boltzmann equation, the recombination velocity parameter S in the boundary conditions for diffusion of photoexcited electrons is expressed in terms of the quantum-mechanical reflectance of the interface and transport parameters for the interfacial region. The recombination velocity at the photoemittersubstrate interface in a transmission photocathode is expressed in terms of material parameters. Recent experimental data are analysed and factors favouring low recombination velocities are discussed. It is shown that in general, the ratio of the empirical surface escape probability P to the theoretical surface transmittance T may vary above or below unity. Physically, PIT> 1 arises because an electron reflected back from the surface into the bulk has a significant probability of re-entering the bandbending region for another attempt at emission. Calculations of PIT for NEA GaAs and Si show a significant increase above unity for small bandbending distances, particularly when rapid intervalley scattering processes are inoperative. Comparison of reported experimental data on NEA GaAs:Cs-0 with recent apriori calculations of T shows that correction for surface recombination effects removes a serious discrepancy between experiment and calculation for emission from the (1 10) face.

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Photoemissive detectors

Zwicker¹

1980

Topics in Applied Physics

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The performance of negative electron affinity photocathodes

Cited by 25 publications

References 8 publications

Functional Control of Peptide Amphiphile Assemblies via Modulation of Internal Cohesion and Surface Chemistry Switch

Functional Control of Peptide Amphiphile Assemblies via Modulation of Internal Cohesion and Surface Chemistry Switch

Interpretation of the surface boundary conditions in the diffusion model for NEA photoemission

Photoemissive detectors

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