Ana M. Benito

Ana M. Benito
CSIC. CONSEJO SUPERIOR DE INVESTIGACIONES CIENTÍFICAS · INSTITUTO DE CARBOQUIMICA. ZARAGOZA (SPAIN)

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About

224
Publications
20,799
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7,166
Citations
Additional affiliations
June 1999 - present
Spanish National Research Council
April 1999 - November 2015
Spanish National Research Council
Position
  • Senior Researcher
January 1994 - December 1995
University of Sussex
Description
  • Synthesis of Fullerene derivatives Preparation of carbon nanotubes
Education
February 1990 - December 1993
CSIC-Univ. Zaragoza
Field of study
September 1982 - June 1987

Publications

Publications (224)
Article
Gold nanoparticles (AuNPs) with sizes between 3 and 10 nm were firmly supported on pristine multi-walled carbon nanotubes (MWCNT) in high yields by a facile linker-free deposition route using aqueous suspensions of pre-reduced gold precursors. For the first time, the resulting AuNP-MWCNT hybrid material was employed as catalyst for the hydrogenatio...
Article
Full-text available
The game‐changing role of graphene oxide (GO) in tuning the excitonic behavior of conjugated polymer nanoparticles is described for the first time. This is demonstrated by using poly(3‐hexylthiophene) (P3HT) as a benchmark conjugated polymer and employing an in situ reprecipitation approach resulting in P3HT nanoparticles (P3HTNPs) with sizes of 50...
Article
The emission of a bright blue fluorescence is a unique feature common to the vast variety of polymer carbon dots (CDs) prepared from carboxylic acid and amine precursors. However, the difficulty to assign a precise chemical structure to this class of CDs yet hampers the comprehension of their underlying luminescence principle. In this work, we show...
Article
Graphene oxide (GO) and related materials are widely reported to enhance the photocatalytic activity of zinc oxide. However, the origin of the observed performance improvements remains elusive and studies contributing to a deeper understanding of this critical issue are largely missing. In this work, we have prepared a set of benchmark ZnO-GO hybri...
Article
Full-text available
In the vast field of conductive inks, graphene-based nanomaterials, including chemical derivatives such as graphene oxide as well as carbon nanotubes, offer important advantages as per their excellent physical properties. However, inks filled with carbon nanostructures are usually based on toxic and contaminating organic solvents or surfactants, po...
Article
The development of membranes for nanofiltration applications requires not only selective layers but also suitable supports to control their synthesis as well as to enable efficient and competitive membrane performances. Single-walled carbon nanotube free-standing films (denoted as buckypaper) have been used as supports for the preparation of polyam...
Article
Full-text available
Two cellulose nanocrystals/single-walled carbon nanotube (CNC/SW) hybrids, using two cellulose polymorphs, were evaluated as electrochemical transducers: CNC type I (CNC-I/SW) and CNC type II (CNC-II/SW). They were synthesized and fully characterized, and their analytical performance as electrochemical sensors was carefully studied. In comparison w...
Article
Full-text available
Graphene oxide (GO) is widely used as a component in thin film optoelectronic device structures for practical reasons because its electronic and optical properties can be controlled. Progress critically depends on elucidating the nanoscale electronic structure of GO. However, direct experimental access is challenging because of its disordered and n...
Article
Full-text available
Carbon nanotubes (CNTs), graphene aerogels (GAs), and their hybrid (CNT-GA) prepared by hydrothermal treatment were tested in the electrocatalytic oxygen reduction reaction (ORR). The importance of porous structure derived from the combination of mesoporosity coming from CNTs with macroporosity stemming from GAs was evidenced because the hybrid car...
Article
Nanomaterials offer exciting properties and functionalities. However, their production and processing frequently involve complex methods, cumbersome equipments, harsh conditions and hazardous media. The capability of living beings to accomplish this purpose using mild conditions offers a sustainable, biocompatible and environmentally friendly alter...
Article
Nanomaterials offer exciting properties and functionalities. However, their production and processing frequently involve complex methods, cumbersome equipments, harsh conditions and hazardous media. The capability of living beings to accomplish this purpose using mild conditions offers a sustainable, biocompatible and environmentally friendly alter...
Article
Centrifugation of liquid dispersions is a typical technique being employed to separate single-walled carbon nanotubes (SWCNTs) from big aggregates and impurities. Shining light on the underlying mechanism contributes to a more efficient preparation of corresponding suspensions or inks with improved properties. In this work, we model the sedimentati...
Preprint
Full-text available
We report an in-depth study of the reduction of graphene oxide (GO) by in-situ thermal transmission electron microscopy (TEM) analysis. In-situ heating high-resolution TEM (HRTEM) imaging and electron energy-loss spectroscopy (EELS) measurements have been combined to identify the transformations of different oxygen functional groups, the desorption...
Preprint
Full-text available
Graphene oxide (GO) is reduced by Joule heating using in-situ transmission electron microscopy (TEM). The approach allows the simultaneous study of GO conductivity by electrical measurements and of its composition and structural properties throughout the reduction process by TEM, electron diffraction and electron energy-loss spectroscopy. The small...
Article
Recently, 3D graphene aerogel has garnered a high interest aiming at benefiting of the excellent properties of graphene in devices for energy storage or environmental remediation. Hydrothermal gelation of GO dispersion is a straightforward method that offers many opportunities for tuning its properties and for processing it to devices. By adjusting...
Article
We report an in-depth study of the reduction of graphene oxide (GO) by in-situ thermal transmission electron microscopy (TEM) analysis. In-situ heating high-resolution TEM (HRTEM) imaging and electron energy-loss spectroscopy (EELS) measurements have been combined to identify the transformations of different oxygen functional groups, the desorption...
Chapter
Even though many members from the broad family of carbon nanostructures have been known to us for decades, and despite their promising potential in biology and medicine, there is still a long way ahead to reach the goal of using them in real applications. The cause of such a gap still lies in the persistent drawbacks of insolubility, processability...
Article
Correction for ‘Optical properties and carrier dynamics in Co-doped ZnO nanorods’ by Aswathi K. Sivan et al. , Nanoscale Adv. , 2021, DOI: 10.1039/d0na00693a.
Article
Crystallization under stringent cylindrical confinement leads to novel quasi-one-dimensional materials. Substances with strong cohesive interactions can eventually preserve the symmetries of their bulk phase compatible with the restricted geometry, while those with weak cohesive interactions develop qualitatively different structures. Frozen molecu...
Article
Full-text available
The controlled modification of the electronic properties of ZnO nanorods via transition metal doping is reported. A series of ZnO nanorods were synthesized by chemical bath growth with varying Co content from 0 to 20 atomic % in the growth solution. Optoelectronic behavior was probed using cathodoluminescence, time-resolved luminescence, transient...
Article
Laser-deposited carbon aerogel is a low-density porous network of carbon clusters synthesized using a laser process. A one-step synthesis, involving deposition and annealing, results in the formation of a thin porous conductive film which can be applied as a chemiresistor. This material is sensitive to NO2 compared to ammonia and other volatile org...
Article
Full-text available
Developing highly efficient and stable photoelectrochemical (PEC) water splitting electrodes via inexpensive, liquid phase processing is one of the key challenges for the conversion of solar energy into hydrogen for sustainable energy production. ZnO represents one the most suitable semiconductor metal oxide alternatives, owing to its high electron...
Preprint
Full-text available
The controlled modification of the electronic properties of ZnO nanorods via transition metal doping is reported. A series of ZnO nanorods were synthesized by chemical bath growth with varying Co content from 0 to 20 atomic % in the growth solution. Optoelectronic behavior was probed using cathodoluminescence, time-resolved luminescence, transient...
Article
Full-text available
Carbon nanotubes (CNTs) processed into conductive films by liquid phase deposition technologies reveal increasing interest as electrode components in electrochemical device platforms for sensing and energy storage applications. In this work we show that the addition of acrylic latex to water-based CNT inks not only favors the fabrication of stable...
Article
Electrically conductive graphene aerogels are attracting great interest as functional materials. Nevertheless, graphene aerogels synthetized from graphene oxide usually exhibit a low electrical conductivity. In order to increase conductivity, herein a post-synthesis thermal treatment at several temperatures (from 300 ºC to 1000 ºC) has been applied...
Article
Controlling the physicochemical properties of nanoparticles in fluids directly impacts on their liquid phase processing and applications in nanofluidics, thermal engineering, biomedicine and printed electronics. In this work, the temperature dependent viscosity of various aqueous nanofluids containing carbon nanotubes (CNTs) or graphene oxide (GO),...
Article
Various types of fluorescent carbon nanoparticles, often called carbon dots (CDs), are synthesized by different polycondensation methods: microwave irradiation, hydrothermal conditions or solution chemistry at ambient temperature with subsequent chemical functionalization. The CDs are deposited on TiO2 films to be probed as electron transport layer...
Article
The preparation of MoS 2 -polymer carbon nanodot (MoS 2 -PCND) hybrid material was accomplished by employing an easy and fast bottom-up synthetic approach. Specifically, MoS 2 -PCND was realized by the thermal decomposition of ammonium tetrathiomolybdate and the in-situ complexation of Mo with carboxylic acid units present in the surface of PCNDs....
Article
Reduced graphene oxide aerogels doped with nitrogen have been prepared via two different strategies, namely, direct doping of rGO nanosheets with NH3 (GANH3) and coating the rGO nanosheets with an N-containing amorphous carbon derived from polydopamine (GADA). Both methods lead to comparable N/C ratios (3.4–4.7 %) but the relative contribution of q...
Article
A facile strategy for the controllable growth of CdS nanoparticles at the periphery of MoS 2 en route the preparation of electron donor‐acceptor nanoensembles is developed. Precisely, the carboxylic group of α‐lipoic acid, as addend of the modified MoS 2 obtained upon 1,2‐dithiolane functionalization, was employed as anchor site for the in‐situ pre...
Article
Reduced graphene oxide aerogels synthetized using different times of hydrothermal treatment have been tested as raw material to prepare electrochemical supercapacitors. The gravimetric electrochemical capacitance measured using 1 M Na2SO4 as electrolyte was maximized for aerogels that underwent 45 min of hydrothermal treatment. The aerogels synthet...
Article
Nanocellulose is increasingly being investigated as a paradigm of a sustainable nanomaterial, because of its extraordinary physical and chemical properties, together with its renewable nature and worldwide abundance. The rich structural diversity in cellulose materials is represented by different crystalline allomorphs, from which types I and II st...
Article
Full-text available
The performance of organic thin film optoelectronic devices strongly relies on the nanoscale aggregate structure of the employed conjugated polymer. Their impact on electronic interface interactions with adjacent layers of graphene, widely reported to improve the device characteristics, yet remains an open issue, which needs to be addressed by an a...
Article
We present a general procedure for the synthesis and in situ functionalization of highly fluorescent non-conjugated polymer dots, by exploiting the room-temperature carbodiimide-mediated condensation between citric acid and amines. The versatility of this method is proved by the preparation and characterization of a broad set of fluorescent nanopar...
Article
The effect of thermal reduction of graphene oxide on the hydrogen sorption and desorption kinetics was studied by temperature-programmed desorption in the 7–120 K temperature range. The heat treatment of graphene oxide samples resulted in a decrease in the activation energy for hydrogen diffusion by more than an order of magnitude (by a factor of 1...
Article
The effect of the thermal reduction of graphene oxide on the kinetics of sorption and desorption of hydrogen was studied by the method of thermo-programmed desorption in the temperature interval of 7–120 K. The thermal treatment of the graphene oxide samples decreased the activation energy of hydrogen diffusion by more than one order (by a factor o...
Article
3D porous graphene microarchitectures with aligned and continuous channels are of paramount interest for several applications such as pollutant removal, energy storage or biomedical engineering. For these applications, an accurate control in the pore microstructure is of capital importance. Freeze casting is a well-stablished technique to prepare g...
Article
The robust adhesion of single-walled carbon nanotubes (SWCNTs) to plastic substrates is a key issue toward their use in flexible electronic devices. In this work, semitransparent SWCNT films were prepared by spray-coating on two different plastic substrates, specifically poly(ethylene terephthalate) and poly(vinylidene fluoride). The deposited SWCN...
Article
Full-text available
Reduced graphene oxide (rGO) is widely seen as the most promising route for the low-cost mass production of graphene for many applications ranging from ultrathin electrodes to structural nanocomposites. The Hummers and Marcano methods are the two most successful approaches for producing high-performance rGO, but have been criticized for producing t...
Article
The transfer of nanoscale properties from single‐walled carbon nanotubes (SWCNTs) to macroscopic systems is a topic of intense research. In particular, inorganic composites of SWCNTs and metal oxide semiconductors are being investigated for applications in electronics, energy devices, photocatalysis, and electroanalysis. In this work, a commercial...
Article
Full-text available
The effect of doping on electronic properties in bulk single-walled carbon nanotubes (SWCNT) samples is studied for the first time by a new in situ Raman spectroelectrochemical method, and further verified by DFT calculations and photoresponse. We use p-/n- doped SWCNTs prepared by diazonium reactions as a versatile chemical strategy to control the...
Article
Transition metal dichalcogenides (TMDs) attract increased attention for the development of donor-acceptor materials enabling improved light harvesting and optoelectronic applications. The development of novel donor-acceptor nanoensembles consisting of poly(3-thiophene sodium acetate) and ammonium functionalized MoS2 and WS2 was accomplished, while...
Article
Nanostructured TiO2and graphene-based materials constitute components of actual interest in devicesrelated to solar energy conversion and storage. In this work, we show that a thin layer of electro-chemically reduced graphene oxide (ECrGO), covering nanostructured TiO2photoelectrodes, cansignificantly improve the photoactivity. In order to understa...
Article
Full-text available
Carbon nanofoam (CNF) is a highly porous, amorphous carbon nanomaterial that can be produced through the interaction of a high-fluence laser and a carbon-based target material. The morphology and electrical properties of CNF make it an ideal candidate for supercapacitor applications. In this paper, we prepare and characterize CNF supercapacitor ele...
Article
Exfoliated semiconducting MoS2 and WS2 were covalently functionalized with 1,2-dithiolane-modified carbon nanodots (CNDs). The newly synthesized CND-MoS2 and CND-WS2 hybrids were characterized by spectroscopic, thermal and elec-tron microscopy imaging methods. Based on electronic absorption and fluorescence emission spectroscopy, modulation of the...
Article
The charge-transfer characteristics of nanostructured carbon/TiO2 electrodes are studied by cyclic voltammetry under photoelectrochemical conditions exploiting the electrooxidation and electroreduction of H2O2 in an alkaline medium. Films of composites were prepared by physically mixing TiO2 with 5 wt% of either single-walled carbon nanotubes (SWCN...
Article
We report on the preparation, characterization and photophysical and electrocatalytic properties of carbon dots (CDs)/MoS2 ensembles. Based on electrostatic interactions, ammonium functionalized MoS2, prepared upon reaction of 1,2‐dithiolane tert‐butyl carbamate with MoS2 followed by acidic deprotection, was coupled with CDs bearing multiple carbox...
Article
Hydration of a multi-layered graphene oxide (GO) paper in water vapor atmosphere was studied by in-situ X-ray scattering over a wide range of relative humidity (RH). The intercalation of water molecules physically adsorbed between GO layers induces the expansion of the interlayer distance. Two regimes of adsorption are clearly evidenced according t...
Article
Full-text available
Carbon nanofoam (CNF) is a low-density, high-surface-area material formed by aggregation of amorphous carbon nanoparticles into porous nanostructures. We report the use of a pulsed infrared laser to prepare CNF from a graphene oxide (GO) target material. Electron microscopy shows that the films consist of dendritic strings which form web-like three...
Article
Full-text available
Three-dimensional graphene aerogels of controlled pore size have emerged as important platform for several applications such as energy storage or oil-water separation. The aerogels of reduced graphene oxide are mouldable and lightweight, with porosity up to 99.9 % consisting mainly of macropores. Graphene aerogels preparation by self-assembling in...
Chapter
Single-walled carbon nanotubes (SWCNTs) show either metallic or semiconducting character, and are potential candidates for the development of small electronic devices. However, commercial SWCNT materials consist of a mixture of many different SWCNT conformations and certain impurities. In this work, SWCNTs are dispersed in an aqueous medium, purifi...
Chapter
The family of carbon nanostructures includes a great number of forms with different properties derived from their reduced dimensionality. In particular, carbon nanotubes (CNTs) and graphene show special electronic, optical, mechanical and chemical properties that allow their potential application in new materials and devices. The real possibilities...
Article
Hybrid film electrodes were made of nanocrystalline titanium dioxide (TiO2) and various percentages of single-walled carbon nanotube (SWCNT) fillers up to 5.5 wt%. A complete photoelectrochemical study was performed in both alkaline and acidic conditions by using cyclic voltammetry, potentiostatic photocurrent measurements, and open-circuit-potenti...
Article
X-ray scattering (XRS) experiments have been performed on multi-layered graphene oxide (GO) paper. GO can be easily hydrated as water naturally intercalates in the hydrophilic nanostructure. The effect of the intercalated water on the XRS signals is measured during dehydration under thermal treatment in the temperature range 298–473 K as well as du...
Article
Full-text available
Owing to their great interest for energy storage and sensing applications, multi-layer papers consisting of graphene oxide – carbon nanotube (GO-CNT) hybrid sheets were prepared by in-situ exfoliation of graphite oxide in the presence of oxidized CNTs (oCNTs). For the first time we elucidate the influence of oCNTs on chemisorbed water (CW), i.e. wa...
Chapter
Full-text available
Graphene oxide (GO) is obtained by chemical oxidation and exfoliation of natural graphite. In the last decade, it has attracted a widespread interest for its mechanical strength, tunable optoelectrical properties, simple processability and its potential as precursor for a low-cost and large-scale production of graphene. Indeed, chemical and thermal...
Article
Full-text available
The kinetics of the sorption and the subsequent desorption of 4He by the starting graphite oxide (GtO) and the thermally reduced graphene oxide samples (TRGO, Treduction = 200, 300, 500, 700 and 900 C) have been investigated in the temperature interval 1.5 - 20 K. The effect of the annealing temperature on the structural characteristics of the samp...
Article
Full-text available
The type and distribution of oxygen functional groups in graphene oxide and reduced graphene oxide remain still a subject of great debate. Local analytic techniques are required to access the chemistry of these materials at a nanometric scale. Electron energy loss spectroscopy in a scanning transmission electron microscope can provide the suitable...
Article
Full-text available
The sorption of 4He by graphene oxide powders thermally reduced at T = 200, 300, 500, 700, 900 °C has been investigated in the interval 1.5-290 K. The measured dependence of the quantity of sorbed helium upon the reduction temperature shows up as a nonmonotonic curve. The highest quantities of helium were sorbed by the samples reduced at T = 300 an...