Sidney JL Ribeiro

São Paulo State University | Unesp · Institute of Chemistry

Biopolymers such as carboxymethyl cellulose and hyaluronic acid are alternative substrates for conformable organic light-emitting diodes (OLEDs). However, drawbacks such as mechanical stress susceptibility can hinder the device’s performance under stretched conditions. To overcome these limitations, herein, we developed a nanocomposite based on CMC...

The integration of organic components into inorganic silica systems through sol–gel synthesis has significantly expanded the potential applications of these materials by enhancing features such as transparency, crack resistance, flexibility, and the introduction of new functional groups. Understanding the influence of organic groups on the sol–gel...

Abstractl Bacterial nanocellulose hydrogels offer a versatile platform and promising porous support for the integration of inorganic photoactive nanostructures, enabling the design of functional hybrid and nanocomposite materials for water treatment and purification. However, the impact of different drying methods on the resulting hybrid gels needs...

Correction for ‘Carbon dots on LAPONITE® hybrid nanocomposites: solid-state emission and inter-aggregate energy transfer’ by Bruno S. D. Onishi et al. , Nanoscale , 2024, https://doi.org/10.1039/d3nr06336d.

Solid-state and aquous emission by hybrids nanocomposites based on carbon dots/LAPONITE® – energy transfer (ET) between aggregates.

Luminescent nanoparticles have shown great potential for thermal sensing in bio-applications. Nonetheless, these materials lack water dispersibility that can be overcome by modifying their surface properties with water dispersible molecules such as cysteine. Herein, we employ LiYF4:Er³⁺/Yb³⁺ upconverting nanoparticles (UCNPs) capped with oleate or...

Developing metal-free electrodes for prototypes of bio-based devices is an essential step in producing non-toxic components for implantable devices and wearables. In particular, the advancement in self-powered devices is a hot topic for several applications due to the possibility of creating free-battery devices and sensors. In this paper, the modi...

This research endeavors to overcome the significant challenge of developing materials that simultaneously possess photostability and photosensitivity to UV‐visible irradiation. Sulfurized nanorod (NR)‐like ZnO/Zn(OH)2 and hierarchical flower‐like γ‐Zn(OH)2/ϵ‐Zn(OH)2 were identified from XRD diffraction patterns and Raman vibrational modes. The sulf...

The unique tunable properties of glasses make them versatile materials for developing numerous state-of-the-art optical technologies. To design new optical glasses with tailored properties, an extensive understanding of the intricate correlation between their chemical composition and physical properties is mandatory. By harnessing this knowledge, t...

The improper disposal of potentially dangerous metal-containing wastes is detrimental to the environment and human health, requiring the development of easy methods for removing these cations, particularly in water bodies. The influence of different surface-charged lamellar materials on the sorption and desorption of Cr6+, Cu2+, and Mn2+ in aqueous...

Urea is the main nitrogen source applied in agriculture and directly impacts agricultural productivity. However, it presents significant losses that reduce plants’ nitrogen use efficiency (NUE) and promote greenhouse gas emissions, such as N2O. The coating technology allows for an increase in the NUE, making the nutrient available gradually and uni...

The high quantum efficiency and long lifetimes of upconverting rare-earth-doped systems make luminescence band spectral overlap a particularly common phenomenon, frequently associated with various excitation and relaxation pathways. While it is often considered challenging to experimentally distinguish such overlapping luminescent bands, herein it...

Polymers based on vegetable oils can be suitable candidates for the replacement of fossil polymers, for instance, polyurethanes (PU) based on castor oil. However, the synthesis PU materials are normally carried out using organic solvents, metals, and high temperatures. To overcome these problems, the sol-gel route is an alternative approach based o...

Near-infrared (NIR)-emitting ZnGa2O4:Cr3+ (ZGO) persistent luminescent nanoparticles (PLNPs) have recently attracted considerable attention for diverse optical applications. The widespread use and promising potential of ZGO material in different applications arise from its prolonged post-excitation emission (several minutes to hours) that eliminate...

Periodic dielectric structures offer an efficient way to control light propagation at micro- and nanoscale, also presenting low losses. Among many techniques that can produce such structures, femtosecond Laser-Induced Forward Transfer (fs-LIFT) is a promising one due to its relatively simple implementation and ability to process broad classes of ma...

2D periodic surfaces of silk-fibroin microstructures were fabricated via femtosecond Laser-Induced Forward Transfer, presenting low reflectivity at the mid-infrared region. Also, the low reflectivity feature was further enhanced by coating the structures with carbon.

In recent years, nanoparticulate materials have aroused interest in the field of organic electronics due to their high versatility which increases the efficiency of devices. In this work, four different stable conformations based on the organic semiconductors P3HT and PC71BM were synthesized using the nanoprecipitation method, including blend and c...

We report high incorporation of rare earth ions (RE³⁺) into hafnia nanoparticles prepared by the sol–gel method and investigate how these dopants affect hafnia structure and phase transformation. An ethanolic suspension containing 5-nm hafnia nanoparticles was obtained from HfOCl2.8H2O in ethanol. Pure and 0.1–7 mol% Eu³⁺-doped materials afforded H...

Despite being very promising technology for several devices, triboelectric nanogenerators (TENGs) tend to explore expensive and complex microstructures. This study reports a novel and simple TENG based on the incorporation of silk fibroin in poly (vinyl alcohol) as a simple, low-cost, and easily integrated component for transparent and flexible dev...

Tungsten-phosphate glasses with up to 20 mol% of silver chloride content were prepared using the conventional melt-quenching method. Ag nanoparticles (AgNPs) formation was achieved by nucleation and growth using controlled thermal treatment. Thermal properties and the local structure were studied as a function of Ag content by means of DSC, Raman a...

The development of photonic devices has been largely benefitted by the offer of new flexible and stretchable materials. Many innovative components and devices have been developed for light-based applications. Presently it is recognized that integration of active and passive elements on flexible substrates will simplify many proposed photonic applic...

Whereas lanthanide-based upconverting particles are promising candidates for several micro-and nanothermometry applications, understanding spatially varying effects related to their internal dynamics and interactions with the environment near the surface remains challenging. To separate the bulk from the surface response, this work proposes and per...

Carotenoids over-producing yeasts has become a focus of interest of the biorefineries, in which the integration of the bioproduction with the following downstream processing units for the recovery and purification of carotenoids and other value-added byproducts is crucial to improve the sustainability and profitability of the overall bioprocess. Ai...

Fertilization is essential to provide suitable conditions for plant development and crop productivity, but the environmental cost of fertilizers is a drawback for achieving a sustainable agriculture. A potential alternative is the use of unprocessed (raw) nutrient sources such as elemental sulfur (S⁰) and mineral oxides (ZnO, MnO, CuO) as fertilize...

Sustainable QR Codes In article number 2100227, Sidney J. L. Ribeiro, Luís D. Carlos, and co‐workers demonstrate how to design sustainable QR codes by combining recycled plastic and upconverting nanoparticles. The photothermal response of the QR codes under distinct laser irradiation power densities induces color‐tuning and temperature sensing, whi...

This article proposes an overarching review of the technologies engaged in world wide energy demand which uses from non-renewable to renewable energies. The electricity generated from renewable systems is largely reducing CO2 emissions, one of the greenhouse gasses realesed from non-renewable energy sources that contribute to the global warming. Th...

Low-cost sensors to detect cancer biomarkers with high sensitivity and selectivity are essential for early diagnosis. Herein, an immunosensor was developed to detect the cancer biomarker p53 antigen in MCF7 lysates using electrical impedance spectroscopy. Interdigitated electrodes were screen printed on bacterial nanocellulose substrates, then coat...

Hybrid organic-inorganic polyurethane films based on Castor Oil (CO) was made and characterized by FTIR-ATR, UV-Vis, and fluorescence spectroscopy, showing blue luminescence. The present work is an initial investigation of the application of the films in the photonics field.

In this work, UCNPs nanoparticles were modified with PAA on the surface to facilitate interaction with IgG antibodies from specific bacteria with potential for application in biosensors.

The luminescence quenching by aggregation of carbon dots (CD) could be solved by functionalizing the surface with an alkoxysilane, bounding the nanoparticle directly in the polymer network.The reaction was monitored with ATR-FTIR and bacterial cellulose (BC) was coated with the precursor using sol-gel route, showing blue luminescence of CD.

We employed hyperspectral imaging with nanometric spatial resolution in single NaYF 4 : Yb ³⁺ /Er ³⁺ microcrystals to resolve spatially the luminescence spectrum and to study the temperature distribution at the diffraction limit.

Laponite can improve mechanical strength and preserve the flexibility of sustainable polymers films desirable for application as a Flexible Organic Light-Emitting Diodes substrate. The nanocomposites were based on laponite and carboxymethyl cellulose/hyaluronic acid. The nanocomposites showed adequate flexibility, as well as the laponite showed goo...

Commodity counterfeiting can be resolved by attaching labels made from biopolymers and down- and up-converting particles. Measurements of luminescence spectrum and SEM were made, proving the formation of particles and luminescence.

The development of broad-spectrum photocatalytic materials that allow the use of a larger portion (UV to NIR) of the solar spectrum for photocatalytic processes has attracted great attention. Among visible light-active photocatalysts, silver phosphate (Ag3PO4) stands out prominent for its high photocatalytic activity towards the degradation of diff...

Quick-response (QR) codes are gaining much consideration in recent years due to their simple and fast readability compared with conventional barcodes. QR codes provide increased storage capacity and safer access to information, fostering the development of optical or printed smart tags as preferred tools for the Internet of Things (IoT). Herein, th...

Luminescence Nanothermometry Selecting green fluorescent protein and Ag2S nanocrystals as illustrative multiparametric thermographic phosphors, in article number 2100301, Luís D. Carlos and co-workers demonstrate that the synergy between multiparametric readouts and multiple linear regression makes possible a 10-fold improvement in the performance...

Luminescence thermometry has substantially progressed in the last decade, rapidly approaching the performance of concurrent technologies. Performance is usually assessed through the relative thermal sensitivity, Sr, and temperature uncertainty, δT. Until now, the state‐of‐the‐art values at ambient conditions do not exceed maximum Sr of 12.5% K−1 an...

Fertilization is essential to provide suitable conditions for plant development and crop productivity, but the environmental cost of fertilizer production is a drawback for achieving a sustainable agriculture. Using unprocessed (raw) nutrient sources such as elemental sulfur (S ⁰ ) and mineral oxides (ZnO, MnO, CuO) as fertilizers reduces the envir...

Bacterial nanocellulose (BNC) is a natural biopolymer obtained by gram-negative bacteria by means of a green and inexhaustible biotechnological process using glucose as producing source. BCN hydrogels is formed by cellulose nanofibrils that maintain an open network structure, an ideal matrix to produce new class of organic-inorganic nanocomposites...

Perovskite quantum dots (PQDs) have revolutionized the field of perovskite solar cells in recent years. Using PQDs improves the operational stability of these devices, which is one of their main drawbacks for applications. This factor has motivated an intense search for new advances, from a fundamental aspect to improved performance in devices. The...

Photonic materials featuring simultaneous iridescence and light emission are an attractive alternative for designing novel optical devices. The luminescence study of a new optical material that integrates light emission and iridescence through liquid crystal self-assembly of cellulose nanocrystal-template silica approach is herein presented. These...

Bacterial cellulose (BC) is a biocompatible and nontoxic biopolymer that has been successfully used as a substrate for flexible organic light emitting diodes (OLEDs). Although BC membranes exhibit excellent mechanical properties and industrial scalability, they are semitransparent, which limits their performance. To improve the optical properties o...

In this work, we synthesized colloidal silica nanospheres with an average size of 400 nm by modified Stöber method and successfully fabricated an ordered close-packing silica nanosphere monolayer onto ITO-coated glass substrates using a three-step spin coating method. ITO films showed resistivity comparable to that of commercial ITO and the silica...

Bacterial cellulose (BC) combined with organo-bridged porous silica nanoparticles offers potential opportunities to develop smart hybrid materials such as advanced drug delivery nanosystems. This work reports the preparation of bacterial cellulose membrane (BCM) and their modification by in situ methodology with the organo-bridged precursor 1,4-bis...

Miniaturized environments have emerged as an excellent alternative to evaluate and understand biological mechanisms. These systems are able to simulate macroenvironments with high reproducibility, achieving many results in a short time of analysis. However, microenvironments require specific architectures that can be reached using laser micromachin...

Photocatalyst-coated self-cleaning ceramic tiles are in high demand for indoor and outdoor applications aimed at keeping a clean environment. Their industrial processing, however, often re-quires firing at temperature (1000–1200 °C) much higher than the thermal stability limits of common photocatalysts (< 1000 °C) which results a significant loss i...

Two samples of N-(2-hydroxy)-propyl-3-trimethylammonium, O-palmitoyl chitosan (DPCat) with different average degrees of quaternization named as DPCat35 (DQ¯ = 35%) and DPCat80 (DQ¯ = 80%), were successfully synthesized by reacting glycidyltrimethylammonium chloride (GTMAC) with O-palmitoyl chitosan (DPCh) derivative (DS¯ = 12%). Such amphiphilic de...

BiVO4 nanoparticles deposited onto TiO2 nanotube arrays (TNT) are used as heterostructured photoanodes in a compact-design photo-electrocatalytic (PEC) cell for solar-driven water splitting. No dopants, photosensitizers or other cocatalysts are added to enhance the catalytic activity but attention is focused on the relationship between TNT nanostru...

Glass-ceramics containing rare earth gallium garnets were obtained using glass compositions as reactional medium. This work reports on the synthesis, and structural, morphological, and optical characterizations of Er³⁺ and Tm³⁺-doped Yb3Ga5O12 crystals prepared from controlled cooling of heavy metal oxide glass melts. Micrometric cubic crystals wer...

Bacterial cellulose (BC) is a natural polymer that has fascinating attributes, such as biocompatibility, low cost, and ease of processing, being considered a very interesting biomaterial due to its options for moldability and combination. Thus, BC-based compounds (for example, BC/collagen, BC/gelatin, BC/fibroin, BC/chitosan, etc.) have improved pr...

Owing to the tremendous possibility of contactless temperature probing with micro-and nanometric spatial resolution, photoluminescent single-particle thermometry at the micro or nanoscale is rapidly advancing towards its successful applications in electronics, biological thermal imaging, or investigating thermodynamics around microsystems, for inst...

Fabrication of functional silk fibroin microstructures has extensive applications in biotechnology and photonics. Considerable progress has been made based on lithographic methods and self-assembly approaches. However, most methods require chemical modification of silk fibroin, which restricts the functionalities of the designed materials. At the s...

This research study reports the formation of flexible and multifunctional organic-inorganic hybrid membranes (BC-SiO 2-TiO 2 /Ag) based on bacterial cellulose (BC) that contain photoactive (TiO 2) and antibacterial (Ag) components, rendering them photocatalytic, self-cleaning and UV-shielding properties (due to TiO 2) as well as antibacterial activ...

Near‐infrared (NIR) nanothermometers are sought after in biomedicine when it comes to measuring temperatures subcutaneously. Yet, temperature sensing within the third biological imaging window (BW‐III), where the highest contrast images can be obtained, remains relatively unexplored. Here, LiErF4/LiYF4 rare‐earth nanoparticles (RENPs) are studied a...

CO2 mitigation by cycloaddition to bis-epoxides to obtain bis-cyclocarbonates (CC) paved one way to a new class of polyurethanes (PUs), the non-isocyanate polyurethanes (NIPUs). By using molecules functionalized with alkoxysilyl groups as end chain it is possible to obtain hybrid NIPUs, also called urethanesils, by sol–gel chemistry. Using bis-cycl...

To address the problems associated with the use unsupported nanomaterials in general and molybdenum disulfide (MoS2) in particular, we report the preparation of self-supported hybrid aerogel membranes that combine the mechanical stability and excellent textural properties of bacterial nanocellulose (BC)-based organic macro/mesoporous scaffolds with...

Glasses are materials with highly flexible compositions and high chemical and physical durability. These characteristics make them suitable materials for hosting nanoparticles for different purposes. Hybrid glasses containing magnetic nanoparticles have been highlighted due to their potential for application as ultra-sensitive magnetic sensors and...

The coacervation process of Graham’s Salt Na(PO3)n enabled the preparation of polyphosphate coacervates (CPPs) by adding different metallic ions (Mn+), and/or low-molecular-weight solvents at a specific solution, which resulted in a phase separation. The more viscous phase is termed as CPP and the less viscous one is the supernatant. CPPs have been...

The pursuit of biocompatible, breathable and skin-conformable wearable sensors has predominantly focused on synthetic stretchable hydrophobic polymers. Microbial nanocellulose (MNC) is an exceptional skin-substitute natural polymer routinely used for wound dressing and offers unprecedented potential as substrate for wearable sensors. A versatile st...

Bismuth vanadate (BiVO4, BV) is a promising visible-light responsive semiconductor photocatalyst able to harvest sunlight energy for photoelectrochemical and photochemical applications such as pollutants degradation and oxygen evolution from water. However, the fast recombination of photogenerated electrons and holes and poor electron transport pro...

The 3D-printed scaffold can upconvert NIR laser irradiation into visible light. Higher transparency of biological tissues at NIR wavelengths enables delivering visible light to deep-layers to locally activate a photosensitizer drug (erythrosine B), which in turns generates reactive oxygen species (ROS) involved in tumor cell destruction. The scaffo...

To date, sunlight driven photocatalytic process for wastewater treatment is a great challenge. Herein, the photocatalytic methylene blue (MB) dye degradation activity of silver vanadate nanobelts has been enhanced using concentrated sunlight irradiation. The MB dye degradation factor in normal and concentrated sunlight irradiation is 0.57 and 0.25...

The challenge to obtain stable glasses containing monodisperse magnetic nanoparticles with controlled size and shape is an exciting and almost unexplored field of research. Such new materials can be used in magneto-photonics or ultra-sensitive magnetic sensors. In this work, for the first time, colorless and transparent bulk glasses containing mono...