The localized surface plasmon resonance (LSPR) of oxide-free Cu nanoparticles fabricated by nanosphere lithography is examined UV−vis extinction spectroscopy and electrodynamics theory. LSPR the significantly affected presence copper oxides removal oxide species yields a dramatic difference in observed LSPR. From comparison Cu, Ag, Au similar geometry, we conclude that displays an intense narrow peak comparable to Ag Au.

The localized surface plasmon resonance (LSPR) of Al nanoparticles fabricated by nanosphere lithography (NSL) was examined UV−vis extinction spectroscopy and electrodynamics theory. triangular nanoparticle arrays can support LSP resonances that are tunable throughout the visible into UV portion spectrum. Scanning electron microscope atomic force studies point to presence a thin native Al2O3 layer on nanoparticles. oxide layer, especially tips nanotriangles, results in significant red shift...

This paper investigates on the theorization, design, fabrication and measurement of original phase shifter (PS) operating with two-step stair behavior. The innovative PS is designed unfamiliar stop-band (SB) negative group delay (NGD) passive circuit. elementary SB-NGD topology constituted by resistive, inductive, capacitive lumped network described. Acting as an RF microwave circuit, S-matrix model expressed in function RLC-network parameters. Thus, canonical form transfer (TF) represented...

Purpose The purpose of this paper is to provide the high-pass (HP) negative group delay (NGD) circuit based (RL) network. Synthesis and experimental investigation HP-NGD are developed. Design/methodology/approach research work methodology organized in three phases. definition ideal specifications introduced. synthesis method allowing determine RL elements validation results discussed with comparison between calculated model, simulation measurement. Findings This shows a theory responses...

This paper introduces an original study of low-pass (LP) negative group delay (NGD) circuit.The family the proposed passive network cross-topology was rarely investigated in literature.It acts as a tri-port circuit presenting cross-shaped topology.The present is originally based on S-matrix modelling.The identification method LP-NGD function type established.The considered topology innovatively constituted by resistorless LC-passive network.Thanks to impedance 3-D matrix modelling,...

A series of new quaternary semiconductor materials CsLnCdTe(3) (Ln = La, Pr, Nd, Sm, Gd-Tm, and Lu) was obtained from high-temperature solid-state reactions by the reactive halide flux method. These compounds belong to layered KZrCuS(3) structure type crystallize in orthorhombic space group Cmcm (No. 63). Their features two-dimensional infinity(2)[LnCdTe(3)-] layers edge- vertex-sharing LnTe(6) octahedra with Cd atoms filling tetrahedral interstices, which stack along b-axis. The Cs are...

This paper develops an original design method of high-pass (HP) negative group delay (NGD) integrated circuit (IC). The considered HP-NGD IC is based on a passive topology which essentially composed resistor-inductor (RL) network. presents the first time that unfamiliar HP-topology designed in miniaturized implemented 130-nm CMOS technology. theory voltage transfer function (VTF) analysis elaborated. equations with synthesis formulas resistor and inductor are established. methodology...

Abstract This paper develops a bandpass (BP) negative‐group‐delay (NGD) analysis of multi‐port topology. The circuit under study consists resistorless symmetric coupler constituted by passive LC‐networks. By using the tensorial‐analysis‐of‐networks (TAN) formalism, an innovative enables to verify if four‐port is susceptible exhibit unfamiliar BP‐NGD function. Using TAN different steps method described from branch and mesh spaces via tensor connectivity determine equivalent S‐parameters....

Black single crystals of the two nonstoichiometric cerium coinage-metal oxysulfide compounds CeCu(x)OS and CeAg(x)OS (x approximately 0.8) have been prepared by reactions Ce2S3 CuO or Ag2O at 1223 1173 K, respectively. A black powder sample CeAgOS has stoichiometric reaction Ce2S3, CeO2, Ag2S, Ag 1073 K. These isostructural materials crystallize in ZrSiCuAs structure type with formula units tetragonal space group P4/nmm. Refined crystal results chemical analyses provide evidence that...

This paper develops an original circuit theory of unfamiliar stop-band (SB) negative group delay (NGD) topology. The proposed NGD topology is implemented without inductor component. developed established with passive cell constituted by RC-network based high-pass (HP) and low-pass (LP) composite circuits. analytical investigation the SB-NGD introduced from elaboration voltage transfer function (VTF). canonical form enabling to identify analytically expressed. different characteristics as GD...

This paper introduces an innovative passive topology of bandpass (BP) negative group delay (NGD) electrical circuit implemented with symmetric H-tree network. The multi-port BP NGD is originally represented by a resistorless constituted lumped LC-passive Until now, the electronic circuits available in literature are two-port which using either resistive elements or distributed microstrip topologies. In present investigation, feasibility modelling, design, fabrication and test unfamiliar...

The seven new isostructural quaternary uranium chalcogenides KCuUS3, RbCuUS3, RbAgUS3, CsCuUS3, CsAgUS3, RbAgUSe3, and CsAgUSe3 were prepared from solid-state reactions. These materials crystallize in the layered KZrCuS3 structure type orthorhombic space group Cmcm. is composed of UQ6 octahedra MQ4 tetrahedra that share edges to form 2∞[UMQ3−] layers. layers stack perpendicular [010] are separated by face- edge-sharing AQ8 bicapped trigonal prisms. There no Q−Q bonds structure, so formal...

A transient study of bandpass (BP) negative group delay (NGD) function is devoted in this paper. The analysis applied to an original topology NGD barcode-shape microstrip circuit. performed investigation explains how realize the tri-band time-domain (TD) parametrization test established from BP-NGD specifications circuit under (CUT) based on S-parameter model. input signal a Gaussian pulse characterized bandwidth (BW) and center frequency. feasibility illustrated with experimentation...

Purpose The purpose of this paper is to study, a bridged-T topology with inductorless passive network used as bandpass (BP) negative group delay (NGD) function. Design/methodology/approach BP NGD under study composed an resistive capacitive network. circuit analysis elaborated from the equivalent impedance matrix. Then, analytical model C-shunt voltage transfer function established. considered developed in parameters. properties and characterizations proposed are analytically expressed....

Abstract In this paper, new bridged‐T network operating with bandpass (BP) negative group delay (NGD) function is introduced. The circuit design innovatively based on an inductorless passive RC‐network. innovative topology implemented a R‐shunt configuration. analytical transfer of voltages and equivalent impedance‐matrix are carefully calculated. BP NGD analysis the developed. properties specifications analytically investigated. A proof concept prototype surface‐mounted device printed board...

Abstract The four new compounds CsTmCoS 3 , CsYbCoS CsHoCoSe and CsYbCoSe have been synthesized at 1123 K. These black‐colored isostructural crystallize in the KZrCuS structure type with formula units space group Cmcm of orthorhombic system. these is composed layers separated by Cs atoms. Because there are no Q–Q bonds, formal oxidation states Cs/Ln/Co/Q 1+/3+/2+/2−, respectively. shows paramagnetic behavior μ eff = 11.9(1) B whereas displays an antiferromagnetic‐like transition ∼2.7 K...

Single crystal and bulk powder samples of the quaternary lanthanum copper oxysulfides La5Cu6.33O4S7 La5Cu6O4S7 have been prepared by means high-temperature sealed-tube reactions spark plasma sintering, respectively. In structure La5Cu6.33O4S7, Cu atoms tie together fluorite-like 2∞[La5O4S5+] antifluorite-like 2∞[Cu6S65−] layers La5Cu6O4S7. The optical band gap, Eg, 2.0 eV was deduced from both diffuse reflectance spectra on a sample for (010) face single crystal. Transport measurements at...

DC magnetic susceptibility measurements on CsYbZnSe 3 show a broad transition at approximately 10 K and pronounced differences between zero-field-cooled field-cooled data that lead to experimental effective moments of 4.26(5) BM 4.39(4) BM, respectively. Specific heat confirm there is neither long-range ordering nor phase 1.8 380 K. First-principles electronic structure calculations with without inclusion spin-orbit coupling effects the spins prefer orient along [010] rather than either...

Gold islands, vapor deposited on silicon and quartz by microsphere lithography patterning, are used to nucleate arrays of ZnO nanorods. is grown approximately 0.32 microm2 Au islands carbothermal reduction in a tube furnace. Scanning electron microscopy (SEM) energy dispersive atomic X-ray spectroscopy (EDS) confirm that the gold effectively controls sites nucleation ZnO. Atomic force (AFM) shows 30 nm diameter nanorods grow horizontally, along surface. Alloy droplets characteristic...

A particularly original negative group delay (NGD) theory of <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$\Delta $ </tex-math></inline-formula> -topology is developed in the present paper. The NGD three-port topology a passive circuit purely constituted by capacitors network. model proposed impedance 3-D matrix analytically established function capacitor elements. Then, S-matrix derived using Y-to-S...