We report the use of atomically thin layers graphene as a protective coating that inhibits corrosion underlying metals. Here, we employ electrochemical methods to study inhibition copper and nickel by either growing on these metals, or mechanically transferring multilayer onto them. Cyclic voltammetry measurements reveal effectively suppresses metal oxidation oxygen reduction. Electrochemical impedance spectroscopy suggest while itself is not damaged, under it corroded at cracks in film....

Self-assembled monolayers (SAMs) formed by the adsorption of n-alkanethiols [CH3(CH2)n-1SH; n = 8, 12, 16, 18, 20, 22, and 29] onto copper provide a flexible method for producing coatings that can protect underlying metal against corrosion. The ability to tailor thickness at angstrom-level choice adsorbate allows examination effect variations in film on performance SAM as barrier layer. A combination infrared (IR) spectroscopy electrochemical impedance (EIS) was used correlate structure with...

The kinetics and mechanism for the solution-phase adsorption of n-alkanethiols onto gold to form self-assembled monolayers (SAMs) have been monitored in situ using atomic force microscopy (AFM). Time-dependent AFM images reveal detailed structural information about adsorbed layer during its growth. In 2-butanol, CH3(CH2)17SH molecules initially adsorb on with molecular axis their hydrocarbon chains oriented parallel surface. As surface coverage increases near saturation, a two-dimensional...

Plants and some types of bacteria demonstrate an elegant means to capitalize on the superabundance solar energy that reaches our planet with their conversion process called photosynthesis. Seeking harness Nature's optimization this process, we have devised a biomimetic photonic system makes use photoactive protein complex Photosystem I, immobilized surface nanoporous gold leaf (NPGL) electrodes, drive photoinduced electric current through electrochemical cell. The intent study is further...

Abstract The long‐term success of photosynthetic organisms has resulted in their global superabundance, which is sustained by widespread, continual mass‐production the integral proteins that photocatalyze chemical processes natural photosynthesis. Here, a fast, general method to assemble multilayer films composed one such photocatalytic protein complex, Photosystem I (PSI), onto variety substrates reported. resulting films, akin stacked thylakoid structures leaves, consist matrix permeable...

We investigate near-field energy transfer between chemically synthesized quantum dots (QDs) and two-dimensional semiconductors. fabricate devices in which electrostatically gated semiconducting monolayer molybdenum disulfide (MoS2) is placed atop a homogenous self-assembled layer of core-shell CdSSe QDs. demonstrate efficient non-radiative F\"orster resonant (FRET) from QDs into MoS2 prove that modest gate-induced variation the excitonic absorption lead to large (~500%) changes FRET rate....

Tuning the Fermi energy of silicon through doping leads to alignment bands with redox active sites photosystem I. Integrating I films p-doped results in highest reported photocurrent enhancement for a biohybrid electrode based on Detailed facts importance specialist readers are published as ”Supporting Information”. Such documents peer-reviewed, but not copy-edited or typeset. They made available submitted by authors. Please note: The publisher is responsible content functionality any...

Pore wetting is an important failure mechanism unique to membrane distillation (MD). The existing approach of detection based on distillate conductivity works only when a has failed in the presence fully wicked-through pores. In this study, we develop novel and simple method, measurement cross-membrane impedance, for monitoring dynamics pore enabling early imminent wetting-based failure. Using Triton X-100 induce direct contact MD experiments, demonstrated rapid response single-frequency...

Novel biophotovoltaic devices were prepared by electrochemically entrapping Photosystem I in a conductive polyaniline film, grown<italic>in situ</italic>on TiO₂anodes.

This paper describes the use of gold films that contain underpotentially deposited (upd) metal layers copper or silver as substrates in generation self-assembled monolayers (SAMs). The assembly alkanethiols to form SAMs is compatible with presence upd layer and forms a system contains an interlayer between substrate adsorbed organic monolayer. on these can accommodate both polar nonpolar tail groups, resulting span range wettabilities (θa(H2O) = <15° 113°). have highly organized structures...

Photosystem I (PSI) has drawn widespread interest for use in biomimetically inspired energy conversion devices upon extracting it from plants or cyanobacteria and assembling at surfaces. Here, we demonstrate that a critically dense monolayer of spinach-derived PSI must be formed on an electrode surface to achieve optimal photocurrents, introduce new method preparing these monolayers reduces the time required assembly by approximately 80-fold comparison adsorption solution. This consists...

We demonstrate large area two-dimensional arrays of patterned nanoporous gold for use as easy-to-fabricate, cost-effective, and stable surface enhanced Raman scattering (SERS) templates. Using a simple one-step direct imprinting process, subwavelength (NPG) gratings are defined by densifying appropriate regions NPG film. Both the densified grating pattern shown to contribute SERS enhancement. The resulting substrates exhibit uniform enhancement factors at least 107 monolayer adsorbed...

We report the fabrication of a hybrid light-harvesting electrode consisting photosystem I (PSI) proteins extracted from spinach and adsorbed as monolayer onto electrically contacted, large-area graphene. The transparency graphene supports choice an opaque mediator at elevated concentrations. For example, we photocurrent 550 nA/cm(2) PSI on in presence 20 mM methylene blue, which yields blue solution. PSI-modified has total thickness less than 10 nm demonstrates photoactivity that is order...

Abstract This article reviews the physicochemical aspects of surface‐initiated polymer films used to modify planar and non‐planar surfaces produce micro‐ nanoscale patterned features. Particular emphasis is placed on molecular composition its effect surface bulk properties ultrathin films. Recent advances in use responsive that exhibit dramatically altered upon changes solvent, temperature, or ionic strength are reviewed. The uses materials' impact applications chromatography,...

Over the course of a few billion years, nature has developed extraordinary nanomaterials for efficient conversion solar energy into chemical energy. One these materials, photosystem I (PSI), functions as photodiode capable generating charge separation with nearly perfect quantum efficiency. Because favorable properties and natural abundance PSI, researchers around world have begun to study how this protein complex can be integrated modern devices. This feature article describes some recent...

In this work, we report for the first time entrapment of biomolecular supercomplex Photosystem I (PSI) within a conductive polymer network polyaniline via electrochemical copolymerization. Composite polymer-protein films were prepared on gold electrodes through potentiostatic electropolymerization from single aqueous solution containing both aniline and PSI. This study demonstrates controllable integration large membrane proteins into rapidly composite films, such was observed...

Nanofiltration (NF) membranes have the potential to significantly advance resource recovery efforts where monovalent/divalent ion separation is critical, but their utilization limited by inadequate stability under extreme conditions. "Base separation"-i.e., separating hydroxide from other ions-has emerged as an essential approach in recovery, enabling extraction of multivalent anions (e.g., carbonates and phosphates) hydroxide-rich streams. There a particularly high demand for capable CO2...

Per- and polyfluoroalkyl substances (PFAS) are ubiquitous in society largely due to their unique surface properties, but significant health concerns associated with these underscore the need for PFAS reduction strategies. We report a method substantially reduce amount of PFAS, solvent, time needed synthesize low energy polymer film through copolymerization norbornene (NB) 5-(perfluoro-n-alkyl)norbornenes (NBFn) single process that combines spin coating ring-opening metathesis polymerization...

Conductive polymers provide an effective interface for proteins, particularly in photovoltaic applications. The synthetic toolbox affords a variety of options which to fine-tune protein-polymer properties toward better engineered materials. While prior work has shown compatibility between Poly(3,4-ethylenedioxythiophene) (PEDOT) and Photosystem I, detailed study counteranion effects with interfacing I yet be performed. This study, fills significant gap the field, involves synthesis PEDOT...

This letter details a straightforward electrochemical method for increasing the thermal stability of alkanethiol-based self-assembled monolayers (SAMs) on polycrystalline gold surfaces. Ex situ ellipsometry and X-ray photoelectron spectroscopy were used to follow desorption SAMs into heated hydrocarbon solvent over temperature range 70−105 °C. Alkanethiol-based surfaces modified by underpotential deposition contain one-atom-thick interlayer silver exhibited greater stabilities toward than...

The adsorption of long-chain omega-alkoxy-n-alkanethiols [CH(3)(CH(2))(p-1)O(CH(2))(m)SH; m = 11, 19, 22; p 18, 22] onto copper produces self-assembled monolayers (SAMs) that can provide protection against corrosion the underlying metal substrate. resulting films are 40-60 A in thickness and isostructural with SAMs formed on from unsubstituted n-alkanethiols. As evidenced by electrochemical impedance spectroscopy (EIS), barrier properties these ether-containing depend chain length adsorbate...