In this paper, the relative humidity sensor properties of graphene oxide (GO) and oxide/multiwalled nanotubes (GO/MWNTs) composites have been investigated. Composite sensors were fabricated by direct laser scribing characterized using UV-vis-NIR, Raman, Fourier transform infrared, X-ray photoemission spectroscopies, electron scanning microscopy coupled with energy-dispersive analysis, impedance spectroscopy (IS). These methods confirm composite homogeneity reduction GO/MWNT dominant GO...

Biomechanical sensors are essential components for wearable robots because of their broad spectrum industrial and medical applications. A wide range these uses soft materials with deformation-related electrical properties, namely variable resistors capacitors. Previously, conductive were injected into silicone structures that require several molding steps to build the microchannels. This paper proposes a versatile sensing glove, using simple process preparing different sizes without molding....

An electrochemical sensor for the pesticide Pirimicarb (PMC) has been developed. A screen-printed electrode (SPCE) was used and modified with conducting polymer poly (3,4-ethylenedioxythiophene) (PEDOT) gold nanoparticles (AuNPs) to enhance proprieties. Electrode characterizations were performed using scattering electron microscopy (SEM) cyclic voltammetry (CV). With SPCE/PEDOT:PSS/AuNPs electrode, a new peak at 1.0 V appeared in presence of PMC related oxidation. To elucidate mechanism...

Carbamate pesticide residue assessments are important for water and environmental quality. An eco-friendly electrochemical sensor direct determination of pirimicarb (PMC) based on graphene oxide (GO) Ionic liquid (IL) composites decorated with gold nanoparticles has been developed. The resulting AuNPs@GO/IL@SPCE was characterized by Fourier transform infrared spectroscopy, Raman scanning electron microscopy, energy-dispersive X-ray analysis. electrode's characteristics were evaluated using...

A high-performance electrochemical sensor for methyl parathion (MP) detection was developed using silver nanoparticles (AgNPs) integrated with graphene oxide/ionic liquid (GO/IL) on a screen-printed electrode (AgNPs@GO/IL@SPCE) enhanced sensitivity and stability.

The present contribution proposes an optical method for the detection of glyphosate (GLY) using a Cu(II) bis-(oxamate) complex ([Cu(opba)]2−) as fluorescent probe. It wa found that in acetonitrile solution, its fluorescence increases presence GLY and scales linearly (R2 = 0.99) with concentration range 0.7 to 5.5 µM, which is far below established by different international regulations. probe also selective potential interferents, namely aminomethyl phosphonic acid N-nitrosoglyphosate....

Oligo-oxamate type preligands ensure a coplanar orientation of the coordination units embedded transition metal ions and promote thereby intramolecular magnetic exchange couplings.

The reaction of [Fe(η5-C5H4CH2OH)2] (1) with 2 equiv ClC(O)R (2) (a, R = C6H5; b, 2-CH3-C6H4; c, 3-CH3-C6H4, d, 4-CH3-C6H4) produced the corresponding ferrocenyl carboxylates [Fe(η5-C5H4CH2OC(O)R)2] (3a–d). Treatment [FcCH2OLi] (4-Li) (Fc Fe(η5-C5H5)(η5-C5H4)) (ClC(O))2C6H4 (5) 1,2-((ClC(O))2-C6H4; 1,3-((ClC(O))2-C6H4; 1,4-((ClC(O))2-C6H4) in a 2:1 M ratio gave (FcCH2OC(O))2-C6H4 (6a–c), while 1,3,5-(ClC(O))3-C6H3 (7) 3:1 1,3,5-(FcCH2OC(O))3-C6H3 (8). All compounds were characterized by NMR...

Abstract This article reports the preparation of new mesoporous triazine‐based organic polymers and their characterization. The were synthesized via a nucleophilic condensation reaction between cyanuric chloride bisphenols or aromatic diamine linkers. As result, two types prepared: triazine‐ether triazine‐amine polymers. reveal nature with surface area values ranging 345 1275 m 2 g −1 mesopore volume 0.273 1.03 cm 3 . These determined from argon gas isotherms at 87 K. pore size distribution...

We have investigated with the pulsed ESR technique at X- and Q-band frequencies coherence relaxation of Cu spins

Abstract Treatment of the iron selenide (μ‐Se)[CpFe(CO) 2 ] with one equivalent 1, 3, 5‐C 6 H 3 (COCl) gave organoiron selenocarboxylate complex CpFe(CO) SeCO‐3, ( 1 ), which contains two free acid chloride groups. Complex reacted amines, thiols, and phenols to produce corresponding amides (CONR ) thioesters (COSR) aromatic esters (CO Ar) 4 respectively. was converted into diacid (COOH) 5 or diamide (CONH complexes by reactions NaOH NaNH , The bis(seleno)‐1, 3‐(CpFe(CO) SeCO) ‐5‐C 7...

The reaction of one equivalent [ n -Bu 4 N] 2 [Ni(opboR )] with two equivalents [Cu(pmdta)(X) ] afforded the heterotrinuclear Cu II Ni containing bis(oxamidato) type complexes [Cu Ni(opboR )(pmdta) ]X (R = Me, X NO 3 – ( 1 ); R Et, ClO n- Pr, opboR o -phenylenebis(NR-substituted oxamidato); pmdta N , ’, ”, ”-pentamethyldiethylenetriamine). identities were established by IR spectroscopy, elemental analysis and single-crystal X-ray diffraction studies, which revealed cationic complex fragments...

Abstract Poly(cyclic) oxamates represent novel and potentially multidentate ligands for coordination chemistry. To obtain them, the treatment of 2-nitroaniline with two equivalents oxalyl chloride afforded N,N ′-bis(2-nitrophenyl)oxalamide ( 1 ), by reduction [NH 4 ][CO 2 H] Pd/C, ′-bis(2-aminophenyl)oxalamide , bapoxH 6 ) was synthesized. After addition an equimolar amount to a THF solution aqueous work-up 24-membered macrocycle H 8 L obtained. In analogues experiments, ethoxalyl...

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Bulk quantities of “helmet” type phthalogens are now achievable with broad variation their substituents allowing to study thermal and electrochemical decomposition CoPcs.

Abstract Enhancing the supercapacitors’ performance relies on increased capacitance and voltage window, which are current key challenges for developing new materials. In this study, mononuclear Ni II ‐bis(oxamato) complex ([ n Bu 4 N] 2 [Ni(opba)], 1 ) has been synthesized used as a template in polypyrrole (PPy) based conductive polymer novel electrode material supercapacitor applications. The surface structural properties of PPy PPy/ electrodes were studied using SEM TEM to elucidate their...

In this study, we developed an electrochemical sensor using silver nanoparticles (AgNPs) incorporated onto reduced graphene oxide (rGO) modified screen-printed carbon electrodes (SPCE) for the detection and quantification of carbaryl in grape juice. The proposed sensors demonstrated a limit (LoD) 0.061 µM within concentration range 0.1 to 50 µM. When applied real samples, exhibited satisfactory recovery rates, highlighting their potential practical applications food safety environmental monitoring.

In this study, we developed an electrochemical sensor using silver nanoparticles (AgNPs) incorporated onto reduced graphene oxide (rGO) modified screen-printed carbon electrodes (SPCE) for the detection and quantification of carbaryl in grape juice. The proposed sensors demonstrated a limit (LoD) 0.061 µM within concentration range 0.1 to 50 µM. When applied real samples, exhibited satisfactory recovery rates, highlighting their potential practical applications food safety environmental monitoring.

The electron spin resonance (ESR) and nuclear double (ENDOR) spectroscopies are frequently used to determine hyperfine (A) quadrupole (Q) tensors for the paramagnetic transition-metal complexes, which knowledge enables estimation of density distribution in complex assessment magnetic exchange pathways polynuclear molecular networks. most accurate results can be obtained if complexes isolated a single-crystalline diamagnetic host. In this work we were able detect angle-resolved ESR/ENDOR...