Vertical arrays of ZnO nanowires can decouple light absorption from carrier collection in PbS quantum dot solar cells and increase power conversion efficiencies by 35%. The resulting ordered bulk heterojunction devices achieve short-circuit current densities excess 20 mA cm(-2) up to 4.9%.

Advancements in the field of flexible high-efficiency solar cells and other optoelectronic devices will strongly depend on development electrode materials with good conductivity flexibility. To address chemical mechanical instability currently used indium tin oxide (ITO), graphene has been suggested as a promising transparent but challenges remain achieving high efficiency graphene-based polymer (PSCs) compared to their ITO-based counterparts. Here we demonstrate anode- cathode-based PSCs...

We report on the design of practical surface enhanced Raman scattering (SERS) substrate based upon 3D alumina membranes with cylindrical nanopores chemically modified polyelectrolyte coating and loaded gold nanoparticle clusters. These substrates allow for a molecular-level, label-free detection common plastic explosive materials (TNT, DNT) down to 5−10 zeptograms or 15−30 molecules liquid (HMTD) 1 picogram. Such sensitive organic by utilizing efficient SERS opens path affordable trace...

Growth of semiconducting nanostructures on graphene would open up opportunities for the development flexible optoelectronic devices, but challenges remain in preserving structural and electrical properties during this process. We demonstrate growth highly uniform well-aligned ZnO nanowire arrays by modifying surface with conductive polymer interlayers. On basis structure, we then cathode-based hybrid solar cells using two different photoactive materials, PbS quantum dots conjugated P3HT, AM...

Portable electronic devices have become increasingly widespread. Because these cannot always be tethered to a central grid, powering them will require low‐cost energy harvesting technologies. As response this anticipated demand, study demonstrates transparent organic solar cells fabricated on flexible substrates, including plastic and paper, using graphene as both the anode cathode. Optical transmittance of up 69% at 550 nm is achieved by combining highly electrodes with polymers that...

Abstract Enhanced oil recovery (EOR) plays a significant role in improving production. Tertiary EOR, including surfactant flooding, can potentially mobilize residual after water flooding. Prior to the field deployment, performance must be evaluated using site-specific crude at reservoir conditions. Core flood experiments are common practice evaluate surfactants for displacement efficiency core samples. experiments, however, expensive and time-consuming do not allow pore scale observations of...

The high transparency of graphene, together with its good electrical conductivity and mechanical robustness, enable use as transparent electrodes in optoelectronic devices such solar cells. While initial demonstrations graphene-based organic photovoltaics (OPV) have been promising, realization scalable technologies remains challenging due to their performance and, critically, poor device reproducibility yield. In this work, we demonstrate by engineering the interface between graphene layers,...

We demonstrate the in situ growth of silver nanoparticles porous alumina membranes (PAMs) for use as a surface-enhanced Raman scattering (SERS) detection substrate. This fabrication method is simple, cost-effective, and fast, while providing control over size through entire length cylindrical nanopores with uniform particle density inside pores unachievable by traditional infiltration technique. The was conducted from electroless-deposited nanoscale seeds on interior PAM resulted formation...

We introduce a novel and simple method to fabricate calcium carbonate (CaCO3) micromodels by in situ growing thin layer of CaCO3 nanocrystals with thickness 1-2 μm microfluidic channels. This approach enables us synthetic reservoir having surfaces fully covered calcite, while the dimensions geometries are controllable on basis original have tuned wettability CaCO3-coated microchannels at simulated oil conditions without introducing any chemical additives system; thus resulting oil-wet...

Lead sulfide quantum dot (QD) solar cells employing an ordered bulk heterojunction with ZnO nanowires and band alignment engineering of the QD film achieve photocurrent density greater than 30 mA cm−2, highest reported for a photovoltaic (PV) device ideal gap 1.3 eV. This record performance is shown to be result simultaneous improvement in light harvesting carrier collection efficiency, these effects are generalizable other PV absorber materials. As service our authors readers, this journal...

We demonstrate that layered hydrogel poly(methacrylic acid) capsules (PMAA), produced from hydrogen-bonded (PMAA/poly-N-vinylpyrrolidone) (PMAA/PVPON) multilayer precursors through cross-linking with ethylenediamine (EDA), can facilitate in situ synthesis of gold nanoparticles within walls under ambient conditions. The necessary amine groups are available the (PMAA) shells due to one-end attached cross-linker molecules. also show nanoparticle size be controlled changing pH-dependent balance...

Abstract Orthogonal functionalization of 2D materials by selective assembly at interfaces provides opportunities to create new with transformative properties. Challenges remain in realizing controllable, scalable surface‐selective, and orthogonal functionalization. Herein, dynamic covalent is reported that directs the graphene surfaces liquid–liquid interfaces. This process allows facile addition segregation chemical functionalities impart Janus characteristics graphenes. Specifically,...

Monitoring trace amounts of peroxide-based molecules is challenging because the lack common optical signatures (fluorescence or absorption in UV−vis range) chemical functionality easily detectable with routines. To overcome this issue, we suggest a photochemical decomposition approach followed by analysis fragments fast, sensitive, and reliable Raman spectroscopic method. facilitate approach, employed novel design surface-enhanced scattering (SERS)-active nanoporous substrate based on porous...

Abstract The transformation of periodic microporous structures fabricated by interference lithography followed their freezing below glass transition is described. Periodic porous microstructures subjected to internal compressive stresses can undergo sudden structural at a critical strain. pattern collapsed pores caused the originated during polymerization acrylic acid (rubbery component) inside cylindrical and subsequent solvent evaporation in organized structure. By confining localized...

Micromodels with simplified porous microfluidic systems are widely used to mimic the underground oil‐reservoir environment for multiphase flow studies, enhanced oil recovery, and reservoir network mapping. However, previous micromodels cannot replicate length scales geochemistry of carbonate because their material limitations. Here a simple method is introduced create calcium (CaCO 3 ) composed in situ grown CaCO . nanoparticles/polymer composite microstructures built channels by...

We have demonstrated a nanoengineered substrate composed of micropatterned silver nanoparticles to be used for the label-free mapping adsorbed biomolecules. utilized surface-enhanced Raman scattering (SERS) phenomenon monitor known bioanalytes, protein A and human immunoglobulin G (IgG). The SERS was poly(alylamine hydrochloride) (PAH)/poly(styrenesulfonate) (PSS) layer-by-layer (LbL) nanocoating with confined microscopic stripes. Selective adsorption biomacromolecules is facilitated by...

Silver nanowires functionalized with gold nanoparticles using a polyacrylic acid linker exhibit pH-modulated optical properties, including shift in localized surface plasmon resonance, and triggered surface-enhanced Raman scattering (SERS) effects. The tunable properties are exhibited as result of changes particle coupling caused by the swelling response acid. Detailed facts importance to specialist readers published "Supporting Information". Such documents peer-reviewed, but not copy-edited...

Optimization of pore diameter, the placement nanoparticles, and transmission surface-enhanced Raman scattering (SERS) substrates are found to be very critical for achieving high SERS activity in porous alumina-membrane-based substrates. with a diameter 355 nm incorporating silver nanoparticles show enhancement factors 1010.

A simple, scalable, and cost-effective technique for controlling the growth density of ZnO nanorod arrays based on a layer-by-layer polyelectrolyte polymer film is demonstrated. The nanorods were synthesized using low temperature (T = 90 °C), solution-based method. density-control utilizes thin pre-coated substrate to control mass transport reactant substrate. density-controlled investigated as potential field emission candidates. results revealed that an emitter 7 µm(-2) tapered morphology...

Dual-mode surface-enhanced Raman scattering (SERS)–surface-enhanced fluorescence (SEF) composite nanoparticles have been developed for possible use as oil reservoir tracers. These are composed of metal Ag nanostructured cores, specific dye molecules, and a SiO2 shell coating. Herein, we show that the embedded molecules detectable by both spectroscopies yield dramatically enhanced detectability due to strong SERS–SEF phenomena with limits detection (LOD) low 1 ppb spectroscopy 10...

We demonstrate the facile fabrication of high aspect ratio nanotubes from responsive block copolymer, polystyrene-block-poly(2-vinylpyridine) (PS-b-P2VP), and in situ grown gold nanoparticles. PS-b-P2VP are fabricated by template-assisted assembly utilizing cylindrical pores porous alumina membranes followed its dissolution. Solvent annealing was employed to facilitate ordered phase separation copolymer with nanotube structure, formation nanoparticles P2VP domains occupying inner outer shell...

We fabricated silver nanowire crossbars partially decorated with nanoparticles via a double-step transversal capillary transfer microprinting approach and demonstrated their polarization-dependent surface-enhanced Raman scattering (SERS) properties. that SERS intensity of junctions nanowire−nanoparticle can be turned on/off on demand by the rotation polarization plane, which excites specific plasmon resonances initiates selective excitation/suppression central auxiliary nanostructured...

The concept of a neutral hole-transporting polymer is realized for the first time, by integrating patterned Cl(-) -doped poly(3,4-dimethoxythiophene) thin films into organic solar cells through vacuum-based vapor printing technique. Due to this novel polymer's neutrality, high transparency, good conductivity, and appropriate energy levels, solar-cell efficiency lifetime are significantly enhanced.

Composite magnetic nanoparticles are designed and synthesized with different morphologies as surface-enhanced Raman scattering (SERS) substrates or SERS-active particles. Through the incorporation of a functionality, we provide means to concentrate in low-volume microfluidic channel where detected entity is now either flowing analyte (e.g., tracer chemical) particles contained target reservoir fluid. This collection strategy allows for detection using small amounts material can be optimized...