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Item type:Publication, Rapid Scalable Processing of Tin Oxide Transport Layers for Perovskite Solar Cells(American Chemical Society, 2020-06-22)Abstract The development of scalable deposition methods for perovskite solar cell materials is critical to enable the commercialization of this nascent technology. Herein, we investigate the use and processing of nanoparticle SnO2 films as electron transport layers in perovskite solar cells and develop deposition methods for ultrasonic spray coating and slot-die coating, leading to photovoltaic device efficiencies over 19%. The effects of postprocessing treatments (thermal annealing, UV ozone, and O2 plasma) are then probed using structural and spectroscopic techniques to characterize the nature of the np-SnO2/perovskite interface. We show that a brief ?hot air flow? method can be used to replace extended thermal annealing, confirming that this approach is compatible with high-throughput processing. Our results highlight the importance of interface management to minimize nonradiative losses and provide a deeper understanding of the processing requirements for large-area deposition of nanoparticle metal oxides. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Superhydrophobic and supercapacitive reduced graphene oxide/fluoropolymer nanocoating on polyester fabric via spray mist coating(Elsevier BV, 2025-07-05)Graphene oxide (GO) has attracted significant attention due to its unique structure and wide applications in fields such as renewable energy, microelectronics, and biotechnology. However, the combination of superhydrophobicity and supercapacitance in a single textile coating remains largely unexplored, representing a critical gap in current research. This study addresses this gap by developing a multifunctional nanocoating applied to polyester fabric using reduced graphene oxide (RGO) and a fluoropolymer (FP) via a spray mist coating technique. GO was synthesized by the Hummers and Hoffman method and reduced with environmentally friendly glucose. Structural and morphological modifications were confirmed through XRD, RAMAN, FTIR, XPS, and SEM-FEG analyses. The resulting nanocoated fabrics exhibited exceptional water repellency with contact angles exceeding 150°, enhanced washing, and abrasion resistance. A Box-Behnken design optimized key process parameters (RGO/FP ratio, curing temperature, and time) to achieve peak performance at a contact angle of 160° with a 1:5 ratio (RGO/FP), a curing temperature of 125°C, and a curing time of 2 minutes. Furthermore, the functionalized polyester fabric demonstrated a remarkable specific capacitance of 305.88 F/g, surpassing results from comparable studies and making it suitable for wearable supercapacitor applications. Durability tests revealed stable superhydrophobicity and structural integrity after five wash cycles, equivalent to 25 home washes. SEM-FEG analysis highlighted nanocoating-induced roughness, enhancing the lotus effect, while electrochemical evaluations indicated notable improvements in conductivity and energy storage. This environmentally friendly spray mist coating technique offers a scalable and sustainable approach for creating multifunctional textiles, paving the way for advanced applications in smart fabrics and flexible electronics.Scopus© Citations 8 2 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, A Molecular Probe for the Determination of Aqueous Zn2+ at Sub-Micromolar Concentrations Via Ratiometric Detection(RELX Group (Netherlands), 2025-01-01)12 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Tailoring the Properties of Magnetite/PLA Nanocomposites: A Composition-Dependent Study(Multidisciplinary Digital Publishing Institute (MDPI), 2025)This study focused on composites of magnetite magnetic nanoparticles (MNP) and poly(lactic acid) (PLA) prepared via sonochemical synthesis. The evaluation of MNP loadings (2, 5, 10, 15, and 20 wt.%) provided insights into the structural and reactivity properties of the materials. Methods used included XRD, FT-IR and Raman spectroscopy, SEM and TEM microscopy, textural and thermal analysis (TG and DTA), and magnetic property measurements. The agreement between theoretical and experimental MNP loadings was good. XRD patterns showed predominantly MNP and semicrystalline phases, with a minor maghemite phase detected by FT-Raman and magnetic measurements. FT-IR analysis revealed interactions between MNP and PLA, confirmed by thermal analysis showing higher transition temperatures for the composites (145 °C) compared to pure PLA (139 °C). FT-Raman spectra also indicated that PLA helps prevent iron oxide oxidation, enhancing nanoparticle stability. SEM and TEM micrographs showed well-dispersed, spherical nanoparticles with minimal agglomeration, dependent on MNP loading. The nanocomposites exhibited low N₂ adsorption, resulting in low surface area (~2.1 m²/g) and porosity (~0.03 cm³/g). Magnetic analysis indicated that in the 2MNP/PLA sample, MNP were in a superparamagnetic-like regime at 300 K, suggesting good dispersion of 2 wt.% MNP in the PLA matrix.1 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Evaluation of the Physical and Mechanical Properties of Handmade Paints with Inorganic Pigments from Cusco According to American Society for Testing and Materials’ Standards for Architectural Applications(Multidisciplinary Digital Publishing Institute (MDPI), 2025)The artisanal production of paints using inorganic pigments from the Cusco Valley is considered a sustainable alternative to the use of synthetic industrial paints. This approach not only helps reduce the environmental footprint associated with the use of volatile organic compounds (VOCs) but also utilizes local materials. The present study evaluates the physical and mechanical properties of paints obtained from natural pigments through standardized tests based on the American ASTM standards, focusing on adhesion (ASTM D-3359), drying time (ASTM D-1640), surface hardness (ASTM D-3363), and the performance of the paints when exposed to the environmental factors of Cusco (under real conditions). In this regard, the pigments were extracted from traditional quarries and processed through the sedimentation method (MS) and ball milling (MG). The produced paints were formulated with the addition of polyvinyl acetate (PVA) as a binder and water as a solvent and were applied to standardized panels. The results show that all samples meet the requirements of the technical parameters, demonstrating good adhesion, appropriate drying times, and acceptable hardness for architectural coatings, Chromatic variations (ΔE*) were recorded depending on the processing method and the level of environmental exposure, with paints containing ground pigments (MG) being more resistant to fading. This study concludes that these artisanal formulations represent a technically viable and culturally relevant alternative to industrial coatings, especially in contexts of heritage restoration or sustainable architecture.4 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Deep Neural Network-Assisted Microfluidic pH Sensor(Institute of Electrical and Electronics Engineers Inc., 2025)Water pH measurement is vital as it provides fundamental information about its quality and suitability for agriculture, aquatic ecosystems, industry, and human consumption. Each of these applications may require numerical readings of acidity or alkalinity, preferably using tools that are already ubiquitous, such as cellphones. This work presents a microfluidic lab-on-a-chip system to measure the pH of liquid samples. We used purple cabbage as the colorimetric reagent to produce a 2640-image dataset with pH levels in the range of [2–12] on a polydimethylsiloxane (PDMS) microfluidic recipient. We fed our dataset to our parameterized deep neural network (DNN) to classify our samples and found an accuracy of 99.7%. In addition, we developed a mobile application with an easy-to-use graphic user interface that recognizes the microfluidic device shape, classifies the image’s color, and returns the pH level.1 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Significant Luminescence Enhancement of Ga-Doped WS₂ Monolayers Grown by CVD(American Chemical Society, 2025)Monolayer tungsten disulfide (WS₂) is a direct-band-gap semiconductor that has excellent luminescence properties, which are of great interest for optoelectronic applications. In this study, we investigated the effect of gallium (Ga) on WS₂ monolayers grown by chemical vapor deposition. Our results indicate that Ga-doped WS₂ exhibits a 3.6-fold increase in photoluminescence intensity for doped samples compared to pristine WS₂. To confirm the existence of Ga in the WS₂ structures, resonance Raman spectroscopy and X-ray photoelectron spectroscopy (XPS) were utilized as characterization methods. A redshift of the XPS spectrum was observed as well as an increase in the disorder-related Raman modes, which were attributed to the influence of Ga. XPS analysis and ab initio electronic structure calculations reveal the presence of substitutional Ga atoms as well as Ga atoms adsorbed on WS₂ surfaces.1 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Highly Efficient Ultrasound-Assisted Anthocyanin Extraction for Colorimetric Sensors and Drug Delivery Systems in Wound Dressings(Springer Science and Business Media Deutschland GmbH, 2025)Anthocyanins were extracted from Peruvian purple cabbage (PC) using ultrasonication, a greener and more efficient technique. The anthocyanin extract was incorporated into polymeric alginate membranes to obtain a pH-sensitive biosensor to monitor wound healing processes and drug delivery. The halochromic behavior was tested in five different acidic media (pH 4, 5, 6, 7, and 8) giving a differential colour for each. The antioxidant capacity of the PC extract was evaluated using the ABTS discoloration assay. A 1% (w/v) solution of the lyophilized extract resulted in 55.17 ± 0.46 TEAC mg/g. Phenolic content and equivalents of cyanidin-3-glucoside were evaluated using the Folin-Ciocalteu and pH differential assays, respectively, resulting in 36.1 ± 0.55 GAE mg and 8.63 ± 0.54 of C-3-G mg per gram of lyophilized extract, respectively. Finally, the PC extract was embedded in alginate (AL) membranes and characterized by contact angle and transparency.1 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Curcumin-Loaded Poloxamer 407 Nanoparticles for Wound Healing Applications: Characterization and Antimicrobial Potential(Springer Science and Business Media Deutschland GmbH, 2025)Curcumin offers a promising potential for wound healing applications due to its pharmacological properties, such as antibacterial, antioxidant, and anti-inflammatory activities. This article presents the synthesis of curcumin-loaded poloxamer nanoparticles (CurP-NPs) as a potential drug delivery system for wound healing to circumvent the limitations of curcumin’s clinical utility, such as water insolubility and poor bioavailability. Curcumin and poloxamer concentrations were optimized for CurP-NPs formulation by measuring particle size, polydispersity, and zeta potential. The morphology of CurP-NPs was studied with scanning electron microscopy (SEM). The comparative studies on the antioxidant activity of lyophilized curcumin powder and CurP-NPs were carried out by ABTS cationic radical decolorization assay. Furthermore, the qualitative study of antibacterial activity was carried out by bioautography analysis against the large positive bacteria Staphylococcus aureus. The results showed that the optimal concentration of CurP-NPs was 1.33 g/L, with the smallest size of 95.37 ± 9.2 nm and a PDI of 0.28. In addition, greater antioxidant activity was observed (54%) compared to other concentrations evaluated. Ultimately, CurP-NPs showed an inhibition zone of 1.08 mm, indicating significant antimicrobial potential.2 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Triboelectric Nanogenerators Based on Ulvan Biopolymer: Impact of Lithium Sulfate Doping on Electrical Output(John Wiley and Sons, 2025)The increasing demand for sustainable energy solutions has driven extensive research into energy harvesting devices, such as triboelectric nanogenerators (TENGs). Although various additives, including nanowires and salts, have been investigated to enhance the performance of biopolymer-based TENGs, the use of lithium salts in green algae-based TENGs remains unexplored. Herein, a series of TENGs are fabricated using ulvan, a biopolymer derived from the green algae Ulva nematoidea. To improve the output performance of these TENGs, the ulvan matrix is doped with lithium sulfate (Li2SO4) at concentrations of 0%, 10%, 20%, 30%, 40%, and 50% by weight. Dielectric permittivity measurements are conducted to calculate the surface charge density. The results show an increase from 0.94 nC cm−2 for the pristine film to 1.14 nC cm−2 at 30 wt% Li2SO4, beyond which further increases in salt concentration lead to a decrease in charge density. The incorporation of salts significantly enhances the electrical performance, with the 20% Li2SO4/ulvan device achieving a maximum power density of 0.156 W m−2, representing an 85.7% improvement compared to the pristine ulvan TENG. The open-circuit voltage (Voc) and short-circuit current also increase with salt concentration, with Voc reaching 87.71 V at 30% Li2SO4.1