Manuel Matos

Manuel Matos
Instituto Politécnico de Lisboa | ISEL · Departamento de Engenharia Química

PhD

About

61
Publications
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1,189
Citations
Citations since 2017
6 Research Items
587 Citations
2017201820192020202120222023020406080100
2017201820192020202120222023020406080100
2017201820192020202120222023020406080100
2017201820192020202120222023020406080100
Additional affiliations
January 2004 - present
Institute of Telecommunications
Position
  • Senior Researcher

Publications

Publications (61)
Article
Full-text available
There is an intense and continuous growth of the world population living in cities. This increase in population means an increase in car traffic, an increase in new constructions and an increase in the production of waste that translates into an intensive use of land, particularly in terms of soil contaminants. Among other environmental contaminant...
Article
The synthesis, characterisation and application in organic photovoltaic cells as electron-acceptors of new [1,2,5]thiadiazolo[3,4-g]quinoxaline-based small molecules with oligo(ethylene oxide) solubilising groups and exhibiting tunable optical bandgaps are reported. A new p-type polymer, consisting of a polythiophene derivative substituted with ana...
Conference Paper
O consumo de água é vital para o Homem. A ausência de líquidos ao longo do dia provoca desidratação afetando a saúde. A ingestão de água em quantidade e qualidade contribui para uma vida mais saudável e equilibrada. O setor de abastecimento de água em Portugal teve uma evolução muito positiva, possuindo uma ampla rede com água de boa qualidade. O s...
Conference Paper
A água é recurso escasso que tem de ser protegido. Atualmente, existem atividades urbanas com consumos elevados de água potável, como a lavagem de veículos, cuja produção de água residual pode variar significativamente, dependendo do tipo de sistema de lavagem e do tamanho dos veículos. Assim, é fundamental o tratamento das águas residuais das esta...
Article
Full-text available
Pseudomonas aeruginosa (P. aeruginosa) contain intracellular amidase activity, which catalyses the hydrolysis of short aliphatic amides producing NH4+ and have already been used along with an ammonium ion selective electrode for amide quantification. However, the incorporation of the biological membrane turned to be a challenging process and the fi...
Article
The concerns on metals in urban wastewater treatment plants (WWTPs) are mainly related to its contents in discharges to environment, namely in the final effluent and in the sludge produced. In the near future, more restrictive limits will be imposed to final effluents, due to the recent guidelines of the European Water Framework Directive (EUWFD)....
Article
Electron-acceptor units, combined with bithiophene substituted with flexible chains end-functionalized with cross-linkable moieties, provide soluble donor-acceptor-donor (DAD) it-conjugated oligomer-type molecules with cross-linking ability and broad absorption in the visible spectrum. A study on the cross-linking conditions of the new oligomers to...
Conference Paper
Full-text available
In spite of the widespread use of superplasticizers, it is still not possible to anticipate the compatibility between these materials and a specific cement. Such lack of knowledge does not restrain the use of admixtures in concrete, but it makes it harder to optimise mixtures and can lead to an unexpected behaviour. Therefore, in order to contribut...
Article
An atmospheric aerosol study was performed in 2008 inside an urban road tunnel, in Lisbon, Portugal. Using a high volume impactor, the aerosol was collected into four size fractions (PM0.5, PM0.5–1, PM1–2.5 and PM2.5–10) and analysed for particle mass (PM), organic and elemental carbon (OC and EC), polycyclic aromatic hydrocarbons (PAH), soluble in...
Article
The study of the family of compounds α-(Per)2[M(mnt)2], (M = Cu, Au, Ni, Pd, Pt, Co, Fe) has started more than 30 years ago with the report of first members, but has been always limited by difficulties in the growth of high quality and large single crystals. These compounds can be obtained by oxidation of perylene in the presence of anion salts, ei...
Article
The conditions that allowed for the first time the growth of (Per)2[Pd(mnt)2] crystals by electrocrystallisation are described. The electrocrystallisation is limited by close proximity of the oxidation potentials of the perylene donor and [Pd(mnt)2]- anion. Depending on the experimental conditions different morphologies can be obtained. (Per)2[Pd(m...
Article
The first stages of the electrocrystallization of (Per)(2)[Au(mnt)(2)] salt from dichloromethane on gold, platinum, and highly orientated pyrolytic graphite (HOPG) were investigated by cyclic voltammetry, atomic force microscopy, and X-ray photoelectron spectroscopy in order to understand the determinant factors for nucleation and crystal growth. T...
Article
The conditions for the growth of (Perylene)2 [Pd(mnt)2] crystals either by chemical oxidation and electrochemical routes are described. The electrocrystallisation is limited by close proximity of the oxidation potentials of the perylene donor and [Pd(mnt)2]− anion, and depending on the experimental conditions different morphologies can be obtained....
Article
Per2[Pt(mnt)2] is a low-dimensional organic conductor consisting of parallel conducting (perylene) and magnetic chains (Pt[mnt]2) which undergo a charge density wave (CDW) and spin-Peierls (SP)-transition, respectively. The conducting chain has been studied extensively, however fundamental questions about the spin-dynamics of the magnetic chain in...
Article
Full-text available
This study explores a large set of OC and EC measurements in PM10 and PM2.5 aerosol samples, undertaken with a long term constant analytical methodology, to evaluate the capability of the OC/EC minimum ratio to represent the ratio between the OC and EC aerosol components resulting from fossil fuel combustion (OCff/ECff). The data set covers a wide...
Article
The interaction of parallel conducting perylene and insulating spin-1/2 [Pt(mnt)2] molecular chains in (Per)2[Pt(mnt)2] is investigated through the magnetic field dependence of their coupled Peierls (charge density wave - CDW) and spin-Peierls (SP) ground states. Proton NMR is used to monitor the spin-chain behavior, and signatures in the NMR spect...
Article
Full-text available
The present work reports the results concerning the development and implementation of the first electrochemical biosensor for acrylamide determination, based on a direct biochemical interaction between the analyte and intact bacterial cells, with intracellular enzymatic activity. The biological recognition element consisted of whole cells of Ps...
Article
Atmospheric aerosols of four aerodynamic size ranges were collected using high volume cascade impactors in an extremely busy roadway tunnel in Lisbon (Portugal). Dust deposited on the tunnel walls and guardrails was also collected. Average particle mass concentrations in the tunnel atmosphere were more than 30times higher than in the outside urban...
Article
The optical properties of the one-dimensional organic conductor (perylene)2Pt(mnt)2 and its Au analogue have been investigated at ambient and low temperatures. The spectra along the stacks of the molecules show a simple Drude behavior with no detectable influence of electron-electron interactions. Basing on the spectra for different polarizations a...
Article
Insoluble patterns of cross-linkable conjugated polymers, CPs, are obtained from spin coating their blends with polystyrene, PS, following an approach first demonstrated for poly [2-methoxy-5-(2 0 -ethyl)hexyloxy-2,4-phenylenevinylene] (MEH-PPV) by Castro et al. (Chem. Mater. 2006, 18, 5504). Taking advantage of the CP and PS tendency to phase sepa...
Conference Paper
Full-text available
Lisbon is the capital city of Portugal with about 565,000 residents and a population density of 6,600 inhabitants per square kilometre. The town is surrounded by satellite cities, forming together a region known as "Lisbon Metropolitan Area" with about 3 million inhabitants. It is estimated that more than one million citizens come into the Lisbon a...
Article
Full-text available
The aim of this work was to develop a biosensor for toxic amides using whole cells of Pseudomonas. aeruginosa containing amidase activity, which catalyses the hydrolysis of amides such as acrylamide producing ammonia and the corresponding organic acid. Whole cells immobilized in several types of membrane in the presence of glutaraldehyde and an amm...
Conference Paper
Full-text available
Acrylamide is a toxic amide with potentially hazardous effects on the environment and human health. This paper reports the results regarding the development of a potentiometric biosensor in order to determine the amount of this amide in wastewater samples. The biosystem consisted of whole cells of Pseudomonas aeruginosa containing intracellular ami...
Article
We report the observation of a non-linear conductivity in the charge density wave state of the quasi-one-dimensional molecular conductor (Perylene)2Au(mnt)2 (mnt = maleonitriledithiolate). The onset of the non-linearity is accompanied by broad-band and narrow-band noise. We discuss these results in relation with the current models for charge densit...
Article
We present and analyse microwave dielectric response data under magnetic field in the Peierls ordered state of the quasi-one-dimensional two-chain organic conductor (Per)2[Pt(S2C2(CN)2)2]. The data are shown to provide a unique opportunity to extract the full-temperature profile of the Peierls gap under field. Quantitative agreement with the fluctu...
Article
The conditions for obtaining single crystals of Per2Pt(mnt)2 via an electrochemical process are described. The occurrence of a lower conductivity -phase cannot be avoided. Thermal dependence of resistivity and thermopower of -Per2Pt(mnt)2 is reported and results discussed in comparison with previously known -phase members (M=Cu and Ni) of the Pe...
Article
Full-text available
Recently the authors discovered that the suppression of the charge density wave (CDW) ground states by high magnetic fields in the organic conductor series (Per)2M(mnt)2 is followed by additional high field, CDW-like phases. The purpose of this paper is to review these compounds and to consider the relevant parameters of the materials that describe...
Article
The new compound, (bedt-ttf)[Au(cdc)2], where bedt-ttf stands for bis(3,4;3′,4′-ethylenedithio)2,2′,5,5′-tetrathiafulvalene(+) and cdc for cyanoimidodithiocarbonate(2−), was synthesised. Its structure is monoclinic, space group P21/n, with cell parameters a=6.9031(8)Å, b=21.3213(16)Å, c=7.9833(9)Å, β=91.643(6)°, V=1174.5(2)Å3 and Z=2 and consists o...
Article
The conditions for obtaining single crystals of Per2Pt(mnt)2 via an electrochemical process are described. The occurrence of a lower conductivity β-phase cannot be avoided. Thermal dependence of resistivity and thermopower of β-Per2Pt(mnt)2 is reported and results discussed in comparison with previously known β-phase members (M=Cu and Ni) of the Pe...
Article
Full-text available
Square wave anodic stripping voltammetry (SWASV) was applied to the simultaneous determination of trace amounts of toxic metals Pb(II), Cd(II) and Cu(II) in white poplar (populus) leaves, used as bio indicator and gathered in a chosen area of the city of Lisbon with very high traffic intensity. The leaves were dried and subsequently exposed to an a...
Article
Full-text available
In this work we tested the performance of the bismuth film electrode in the detection and simultaneous determination of toxic metals on real samples with a complex matrix, by square wave anodic stripping voltammetry. The studied samples were white popular leaves gathered in 2ª Circular, which is an area of major traffic intensity of the city of Lis...
Article
The ground states of the quasi-one-dimensional organic metal (Per)2M(mnt)2 (where M = Au and Pt) were investigated by transport and magnetization measurements in magnetic fields of 33 and 45 tesla. The low field charge density wave transition temperature is suppressed by applied fields and a high field insulating state is introduced. We also report...
Article
The Per2M(mnt)2 class of organic conductors exhibit a charge density wave (CDW) ground state below about 12 K, which may be suppressed in magnetic fields of order 20–30 T. However, for both cases of counter ion M(mnt)2 species studied (M = Au (zero spin) and M = Pt (spin 1/2)), new high field ground states evolve for further increases in magnetic f...
Article
Full-text available
The quasi-one-dimensional organic conductor (Per)2Pt(mnt)2 exhibits a charge density wave ground state below 8 K. Magnetoresistance and magnetization measurements show that the charge density wave is suppressed with magnetic fields of order 20 T, above which a high resistance state, with a cascade of subphases, appears. This new state, tentatively...
Article
We report on the use of indium-tin oxide surface modification, by grafting of highly polar p-disubstituted benzenes, in the fabrication of light-emitting diodes. The polar compounds possess COCl or SO2Cl grafting groups and CF3 or NO2 as highly electronegative groups, leading to the formation of a dipolar monolayer, which brings about an increase i...
Article
Full-text available
The charge density wave (CDW) transition temperature in the quasi-one dimensional (Q1D) organic material of (Per)$_2$Au(mnt)$_2$ is relatively low (TCDW = 12 K). Hence in a mean field BCS model, the CDW state should be completely suppressed in magnetic fields of order 30 - 40 T. To explore this possibility, the magnetoresistance of (Per)$_2$Au(mnt)...
Article
We study the effect of indium–tin oxide surface modification by self assembling of highly polar molecules on the performance of single-layer light-emitting diodes (LEDs) fabricated with polyfluorene blends and aluminium cathodes. We find that the efficiency and light-output of such LEDs is comparable to, and sometimes better than, the values obtain...
Article
Microwave experiments have been carried out on the two-chain organic compounds Per2[AuxPt1−x(mnt)2] (x=0;0.02; 1) as a function of temperature and magnetic field. A theoretical mean-field theory is proposed to show how pair-breaking effects due to either alloying, intrinsic disorder or localized spins modify the variation of the Peierls critical te...
Article
A comparative study by pulsed current techniques of the Charge Density Wave (CDW) dynamics and the temperature dependence of the non-linear electrical transport threshold field, Et, for the quasi-one-dimensional molecular conductors (Per)2M(mnt)2, with M=Au and Pt, is presented. The voltage response to unipolar current pulse shows a similar regime...
Article
An EPR study of the solid solutions (per)(2)[Au(1-x)Pt-x(mnt)(2)] (0 less than or equal to x less than or equal to 1) is presented. For pure Au (x=0) compound, the temperature dependences of signal intensity, g-factor and linewidth are typical of a Peierls transition at 12 K. The anisotropy is analysed in the neighbourhood of the metal-insulator tr...
Article
Full-text available
The magnetic-field dependence of the metal-to-insulator transition temperature, Tc(B), in the quasi-one-dimensional systems (Per)2M(mnt)2, with M=Au and Pt, was studied by magnetoresistance measurements under fields up to 18 T. In the Pt compound, our results show that Tc(B) is anisotropic: Tc(B) decreases as B2 up to 18 T with a slope similar to t...
Article
Full-text available
The molecular compounds (Per)2M(mnt)2 where Per = perylene and mnt = maleonitriledithiolate are quasi-one dimensional conductors which undergo metal-to-semiconductor transitions towards a commensurate charge density wave (CDW) state, at T_c = 8 K for M = Pt and T_c=12 K for M = Au. above a threshold field, these molecular systems show nonlinear tra...
Article
Full-text available
We report the observation of nonlinear voltage response both to dc current and to unipolar current pulses in the commensurate charge-density-wave (CDW) state of the molecular conductor (perylene)2Pt(mnt)2 (mnt=maleonitriledithiolate). At T=4.2 K, two nonlinearities in the I-V curves are observed at Et1=8.9 V cm-1 and Et2∼30 V cm-1. Above the thresh...
Article
The dependence on magnetic field of the Peierls transition has been clearly measured on the quasi-one-dimensional compound Per2[Au(mnt)2]. A quadratic dependence of the transition temperature has been found, in agreement with the theoretical predictions.
Article
Nonlinear electrical conductivity measurements in the Charge Density Wave (CDW) state of the quasi-one- dimensional conductors (Per)2M(mnt)2, with MAu, Pt and Co, are reported. Broad band and narrow band noise measurements provide, for the first time in an organic based molecular system, clear evidence for coherent CDW motion as the origin of the...
Article
Full-text available
Specific heat measurements on Per2[M(mnt)2] compounds with M=Pt and Au are reported. An anomaly was found in the Pt compound, ascribed to the magnetic ordering of the Pt(mnt)2 chains as in the Spin-Peierls transition. The comparison of the two compounds enabled a precise determination of the magnetic specific heat. Results above the transition temp...
Article
A survey of the (Perylene)2M(mnt)2 series, with M = Cu, Ni, Co, Fe, Pd, Au, Pt and mnt=maleonitriledithiolate, is presented. The role of the coexistence of itinerant electrons and arrays of localised magnetic moments (for M=Ni, Fe, Pd and Pt) in the phase transitions undergone by these compounds is discussed.
Article
In this article we present experimental investigation (electrical resistivity, thermoelectric power, ESR studies and static magnetic susceptibility) of the alloys (Perylene)2[Au1-xPtx(mnt)2], with special emphasis in the low concentration of the Pt species.
Article
Magnetoresistance measurements in the quasi-one-dimensional conductors (Perylene)2 M(mnt)2, M=Pt and Au, in the range 2 to 300K and under magnetic fields up to 8T are reported. For the first time, a well defined metal-insulator transition was observed in the gold compound. At zero field, this transition occurs at 12.0K and is shifted down to 11.5K...
Article
A new charge transfer complex derived from BEDT-TTF (bis(ethylenedithio)tetrathiafulvalene or ET) has been synthesized: ET2[Au2(i-mnt)2]; in which the anion (imnt)2− is the 1,1-dithio-2,2-dicyanoethylene. This compound crystallizes in the triclinic space group P , with unit cell dimensions . The structure is formed by mixed-stacking columns in whic...
Chapter
Perylene-based compounds of the family (Per)2M(mnt)2 have been studied in our laboratory for several years, after they were first reported by Alcácer and Maki [1].
Article
The absolute thermoelectric power of the three conductors (perylene)2M(mnt)2 (M = Pt, Au, Pd) was measured in the temperature range 10 – 370 K.The results are compared with data from other one-chain conductors, namely the TMTTF and TMTSF families. Deviations from linearity in the metallic regime are attributed to moderate correlation effects.
Article
We describe the synthesis of the new compound (Perylene)2 Au(i-mnt)2 where (i-mnt) is the dianion 1-1-dithio 2,2-dicyanoethylene.The single crystal conductivity is of the order of 102 Ω−1cm−1 at room temperature and metallic. The thermoelectric power is positive (+44 μV K−1). Electrical conductivity and thermoelectric power were measured as a funct...

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Projects (4)
Project
This projetc aims at the development of a piezoelectric biosensor for the detection and quantification of SARS-CoV-2 antibodies as an alternative to the conventional serologic tests. On the other hand this technology will also be tested and optimized for antigen detection and quantification, namely the spike protein of the new coronavirus.
Project
This project aims at the development of biosensors with electrochemical and piezoelectric transductions for acid uric determination in blood and urine in order to monitor and prevention gout. Gout is a clinic resulting from an excess of uric acid in blood. The objective of the study is the development of low-cost methodology for uric acid determination based on easy operation and reusability. One important task of this projetc concerns the optimization of the immobilization procedure for acid uric antibodies onto the transducer surface using differente strategies. The developed biosensors will be tested within the academic community in order to establish a characterization profile of acid uric levels.
Project
The use of treated water resulting from the treatment of waste water in Waste Water Treatment Plants (WWTP) for irrigation is currently discouraged or even prohibited. All treated water from the WWTP is discharged into rivers or at the sea without any other use. However, climate change poses challenges for countries that may involve rethinking this practice. In the countries of southern Europe there is a growing desertification, from south to north, will put pressure on the supply of water for agriculture. The treated water could thus be a valid alternative for the irrigation. It should be remembered that treated water must comply with quality standards in European Directive so that it can be discharged into rivers and oceans (EN 2000/60/EC). The fears of using treated water for irrigation are essentially in two areas: microbial contamination and chemical pollutants. Metals, mostly bio-accumulatives like lead, are of great concern. This accumulation may be dangerous to Human health when consuming these vegetables. In this work, we studied the transfer of metals present in synthetic treated waters, with which two species of vegetables were watered: common brassica cabbages (Brassica oleracea), usually consumed cooked, and lettuces (Lactuca sativa) consumed fresh. Synthetic waters were produced to simulate the actual treated waters in terms of concentrations of toxic metals (Pb, Ni, Cr, Cd). Three concentrations of these metals were used in the tests: the maximum permissible concentration for these metals in the actual treated waters, 2/3 of this maximum concentration and 1/3 of the maximum concentration, as defined in EN 2000/60/EC. Cultivation and irrigation was carried out in a controlled environment (greenhouse) and the tests for each metal/concentration were carried out in separate containers. Soils and plant species were analyzed before watering with contaminated water (zero point) and every month. The analysis of soils, lettuce and cabbage leaves revealed that one month after the beginning of irrigation with contaminated water there was a slight increase in the concentration of lead compared to the initial values. The study will continue until the full growth of lettuces and cabbages which will happen in the month of July. In the final communication the results of contamination of soil, lettuce and cabbage will be presented, evaluating the risk for human health of the use of treated water in agriculture.