Evaporated gold island films have been the subject of studies dealing with a variety spectroscopic and sensing applications. Development these other applications requires film stability as well tunability morphology optical properties films. In present work, ultrathin, island-type were prepared by evaporation 1.0−15.0 nm (nominal thickness) at rate 0.005−0.012 s-1 onto glass substrates modified 3-mercaptopropyl trimethoxysilane (MPTS), latter used to improve Au adhesion glass. The films,...

Gold nanoisland films displaying localized surface plasmon resonance optical response were constructed by evaporation on glass and annealing. The distance sensitivity refractive index (RIS) for island of different nominal thicknesses morphologies investigated using layer-by-layer polyelectrolyte multilayer assembly. Since the polymer forms a conformal coating Au islands substrate between islands, relative to adsorption was evaluated. RIS also determined independently series solvents. An...

Copper(I) oxide nanoparticles (NPs) are emerging as a technologically important material, with applications ranging from antibacterial and fungicidal agents to photocatalysis. It is well established that the activity of Cu2O NPs dependent on their crystalline morphology. Here we describe direct preparation nanocrystals (NCs) various substrates by chemical deposition (CD), without need additives, achieving precise control over NC The preactivated gold seeding treated solutions comprising...

The growing interest in recent years gold island films prepared by vapor deposition on transparent substrates is largely attributed to the prominent localized surface plasmon (SP) extinction associated with nanostructured metal films. In present study, two types of evaporated Au were investigated: (i) (2.5, 5.0, and 7.5 nm nominal thickness) silanized glass annealed 20 h at a temperature <250 °C; (ii) (7.5 10 unmodified 550 or 600 °C. 3D morphology islands was analyzed using high-resolution...

Gold island films displaying localized plasmon properties were prepared by evaporation of just-percolated Au onto glass substrates followed annealing at ≥550 °C. Annealing induces depercolation and formation large, single-crystalline, well-separated islands, partially embedded in the glass. Two dewetting mechanisms identified, depending on initial film morphology. The variability sizes shapes provides effective means tuning position surface resonance (LSPR) band a wide wavelength range. With...

Solid-state thermal dewetting of just-percolated gold films nominal thicknesses in the range 10–16 nm, prepared by evaporation on glass slides and annealing, was systematically studied. The kinetics transition from a percolated film to isolated islands were monitored using situ transmission localized surface plasmon resonance (LSPR) spectroscopy combined with ex high-resolution scanning electron microscopy (HRSEM), (TEM), atomic force (AFM), X-ray diffraction (XRD), selected-area (SAED)...

Electrically conducting nanoparticle nanotubes (NPNTs) with a high surface area are obtained by novel procedure. The assembly of gold nanoparticles on the pore walls surface-modified nanoporous alumina membrane templates under flow conditions is accompanied spontaneous room-temperature coalescence bound nanoparticles, which results, after dissolution, in self-sustained NPNTs that preserve morphology (see picture). Supporting information for this article available WWW...

The use of evaporated ultrathin gold films on mica to obtain transmission UV/vis spectra monomolecular overlayers containing chromophores is demonstrated. substrates (thickness, 13−100 Å) were studied by scanning force microscopy, spectroscopy, and X-ray diffraction found exhibit an array {111} textured islands, whose sizes optical properties can be controlled the evaporation conditions subsequent annealing. this kind enables one clearly resolve absorption (sub)monolayers. This methodology...

Ultrathin gold films prepared by evaporation of sub-percolation layers (typically up to 10 nm nominal thickness) onto transparent substrates form arrays well-defined metal islands. Such display a characteristic surface plasmon (SP) absorption band, conveniently measured transmission spectroscopy. The SP band intensity and position are sensitive the film morphology (island shape inter-island separation) effective dielectric constant surrounding medium. latter has been exploited for chemical...

Strongly bound and highly stable gold island films on glass are obtained by a simple, one-step preparation procedure (see figure) based high-temperature annealing partial embedding of nanostructures evaporated glass, providing effective localized plasmon transducers. Detailed facts importance to specialist readers published as "Supporting Information". Such documents peer-reviewed, but not copy-edited or typeset. They made available submitted the authors. Please note: The publisher is...

Discontinuous, island-type gold films (typically < or = 10 nm nominal thickness) prepared by evaporation of the metal on transparent substrates show a localized surface plasmon resonance (LSPR) extinction in visible-to-NIR range and can be used as optical transducers for monitoring local refractive index change. Such transducers, operated transmission configuration, provide an effective scheme label-free biological sensing using basic spectrophotometric equipment. Optimization sensitivity...

The role of chemical enhancement in surface-enhanced Raman scattering (SERS) remains a contested subject. We study SERS spectra 4-mercaptopyridine molecules excited far from the molecular resonance, which are collected individual electromagnetic hot spots at concentrations close to single-molecule limit. created by depositing Tollen's silver island films on transparent electrode incorporated within an electrochemical cell. Analysis intensity relative those obtained rhodamine 6G same surface...

The poor adhesion of gold nanoparticles (NPs) to glass has been a known obstacle studies and applications NP-based systems, such as glass/Au-NP optical devices. Here we present simple scheme for obtaining stable localized surface plasmon resonance (LSPR) transducers based on Au NP films immobilized silanized annealed. procedure includes high-temperature annealing the film, leading partial embedding in substrate stabilization morphology properties. method is demonstrated using...

Preparation of supported copper nanostructures has been scarce, compared to the more noble metals Ag and Au, mainly due lower stability Cu toward corrosion in aqueous solutions oxidation air, either during or after preparation. Still, as a markedly inexpensive metal, might present an attractive substance, if suitable nanoparticle (NP) deposition stabilization methods could be developed. Here, we first case glass substrates coated with Cu2O NPs using wet chemical (CD), performed under...

Noble metal nanostructures supporting localized surface plasmons (SPs) have been widely applied to chemical and biological sensing. Changes in the refractive index near affect SP extinction band, making plasmon resonance (LSPR) spectroscopy a convenient tool for studying interactions. Carbohydrate–protein interactions are of major importance living organisms; their study is crucial understanding basic processes construction biosensors diagnostics drug development. Here LSPR transducers based...

Evaporation of ultrathin (1.3-10 nm nominal thickness) gold films onto quartz or mica leads to the formation a layer rather uniform islands on transparent support. The morphology island various thicknesses was studied by using atomic force microscopy (AFM) and scanning electron (SEM) imaging. surface plasmon (SP) absorption characteristic such is highly sensitive surrounding medium, with band changing in intensity wavelength upon binding molecules surface. process can be monitored...

A new kind of multilayers based on metal-ion coordination was constructed gold surfaces, where molecular layers are successively added using a highly controlled step-by-step procedure. bifunctional ligand is used as the base layer, bearing cyclic disulfide group to attach surface and bishydroxamate capable ion binding. An 8-coordinating metal such Zr4+ or Ce4+ then coordinated site, followed by exposure second possessing four hydroxamate groups. The tetrahydroxamate molecule ligates (bound...

Gold nanoparticle (NP) mono- and multilayers were constructed on gold surfaces using coordination chemistry. Hydrophilic Au NPs (6.4 nm average core diameter), capped with a monolayer of 6-mercaptohexanol, modified by partial substitution bishydroxamic acid disulfide ligand molecules into their capping layer. A the ligand-modified was assembled via Zr4+ ions onto semitransparent substrate (15 Au, evaporated silanized glass annealed) precoated self-assembled bishydroxamate ligand....

Localized surface plasmons (SPs), that is, charge density oscillations in metallic nanostructures often excited by coupling to electromagnetic radiation, have been widely studied for use sensing applications. Here we present recent work from our group related several major issues the field, which not treated depth previous reviews. Specifically, discuss distance dependence of localized plasmon response; differences response between transmission and reflection mode measurements; comparison...

<italic>In situ</italic>LSPR measurements establish the role of nano Kirkendall effect in Cu nanoparticle oxidation.

Metal nanoparticle nanotubes (NPNTs) have been introduced by us as a new class of template-synthesized, nanoparticle-based possessing unique features such room-temperature preparation, highly corrugated wall structure, electrical conductivity, mechanical stability, and defined optical absorbance. The are prepared passing citrate-stabilized metal (Au, Ag) colloid solution through the pores an aminosilane-modified nanoporous alumina membrane. nanoparticles (NPs) aggregate, forming multilayers...

Ultrathin (typically ≤10-nm thick) gold island films evaporated on transparent substrates show a prominent localized surface plasmon (SP) extinction in the visible-to-NIR range. Changes dielectric properties of contacting medium influence SP absorption band, providing scheme for optical sensing based refractive index change. In present work, gas capability resonance (LSPR) transducers was explored using polymeric coatings as active interface. LSPR were fabricated by spin-coating polystyrene...