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Replacing Sodium Ions with Protons in Vanadophosphate Glass: Suppression of Electronic Conduction by Local Structural Change around Vanadium Ions
2024 / The Journal of Physical Chemistry CCharge carrier conversion in alkali oxide-incorporated transition metal oxide-containing glasses has been investigated extensively; however, the influences of protons on this phenomenon have not been systematically probed. In this study, we employed electrochemical alkali (Na+)–proton substitution (APS) in an attempt to fabricate a mixed protonic–electr...
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Pretreatment-free SERS sensing of microplastics using a self-attention-based neural network on hierarchically porous Ag foams
2024 / Nature CommunicationsLow-cost detection systems are needed for the identification of microplastics (MPs) in environmental samples. However, their rapid identification is hindered by the need for complex isolation and pre-treatment methods. This study describes a comprehensive sensing platform to identify MPs in environmental samples without requiring independent separation or pre-tre...
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Giant nanomechanical energy storage capacity in twisted single-walled carbon nanotube ropes
2024 / Nature NanotechnologyA sustainable society requires high-energy storage devices characterized by lightness, compactness, a long life and superior safety, surpassing current battery and supercapacitor technologies. Single-walled carbon nanotubes (SWCNTs), which typically exhibit great toughness, have emerged as promising candidates for innovative energy storage solutions. Here we prod...
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Photocatalytic degradation of brilliant green and 4-nitrophenol using Ni-doped Gd(OH)3 nanorods
2024 / Scientific ReportsGadolinium hydroxide (Gd(OH)3) was synthesized via a microwave-assisted synthesis method. Nickel ion (Ni2+) was doped into Gd(OH)3, in which 4–12% Ni-Gd(OH)3 was synthesized, to study the effect of doping. The structural, optical, and morphological properties of the synthesized materials were analyzed. The crystallite sizes of the hexagonal structure of Gd(...
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Strain-dependent grain boundary properties of n-type germanium layers
2024 / Scientific ReportsPolycrystalline Ge thin films have attracted considerable attention as potential materials for use in various electronic and optical devices. We recently developed a low-temperature solid-phase crystallization technology for a doped Ge layer and achieved the highest electron mobility in a polycrystalline Ge thin film. In this study, we investigated the effects of...
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Role of Mn in the Ni–Mn/SBA-15 Catalyst for Hydrogen Production by Biomass Steam Reforming at Relatively Low Temperature
2024 / The Journal of Physical Chemistry CThe reaction mechanism of steam reforming of cyclohexane as a model compound of tar on Ni/SBA-15 and Ni–Mn/SBA-15 catalysts was investigated by the transient technique and temperature-programmed reduction method. These catalysts were prepared by the impregnation of SBA-15 with an ethylene glycol-containing metal precursor and characterized by transmission ele...
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Self-Signal-Triggered Drug Delivery System for Tumor Therapy Using Cancer Cell Membrane-Coated Biocompatible Mn3O4 Nanocomposites
2024 / Advanced BiologyIn anti-cancer metastasis treatment, precise drug delivery to cancer cells remains a challenge. Innovative nanocomposites are developed to tackle these issues effectively. The approach involves the creation of manganese oxide (Mn3O4) nanoparticles (NPs) and their functionalization using trisodium citrate to yield functionalized Mn3O4 NPs (F-Mn3O4 NPs), with enhan...
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Interactions between Water and a Hydrophobic Polymer
2024 / The Journal of Physical Chemistry BTo investigate the mechanisms of interactions between a hydrophobic polymer and water, molecular dynamics calculations and Raman spectroscopic measurements of cis-1,4-polyisoprene (PI)-water systems were performed. The results show that PI in water undergoes a coil–globule transition at around 248 K. The transition is attributed to changes in the density and ...
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Responsible Humidity Sensor by Direct Laser Writing on Cork Substrate
2024 / Advanced Sustainable SystemA novel laser-induced graphene (LIG) resistive relative humidity (RH) sensor is successfully fabricated by direct laser writing on a common natural cork sheet. In this work, a straightforward fabrication is presented where LIG, porous multilayer graphene, is generated by a laser photothermal process on a carbon-based substrate, in this case, an agglomerate cork she...
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Complex chemistry of carbon nanotubes toward efficient and stable p-type doping
2024 / Communications MaterialsDeveloping efficient and stable carbon nanotube (CNT) doping techniques and elucidating their chemistry is essential for their further implementation in electronic and energy devices. Here, protonic acids and lithium salts are employed as p-type inducers and stabilizers of the doped state, respectively. Leveraging the electron-withdrawing capability of protons, p...
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Alkali metal bilayer intercalation in graphene
2024 / Nature CommunicationsAlkali metal (AM) intercalation between graphene layers holds promise for electronic manipulation and energy storage, yet the underlying mechanism remains challenging to fully comprehend despite extensive research. In this study, we employ low-voltage scanning transmission electron microscopy (LV-STEM) to visualize the atomic structure of intercalated AMs (potass...
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Dry Laser-Induced Graphene Fractal-like ECG Electrodes
2024 / Advanced Electronic MaterialsFractal-like geometries applied to biosignal-electrodes design show great potential for enhancing the signal acquisition of sensing systems. This study reports a novel approach for flexible, silver-free, and dry fractal-like electrodes based on Laser-Induced Graphene (LIG) obtained through laser photothermal processing of a commercial polyimide film. This one-step ...
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Replicating shear-mediated self-assembly of spider silk through microfluidics
2024 / Nature CommunicationsThe development of artificial spider silk with properties similar to native silk has been a challenging task in materials science. In this study, we use a microfluidic device to create continuous fibers based on recombinant MaSp2 spidroin. The strategy incorporates ion-induced liquid-liquid phase separation, pH-driven fibrillation, and shear-dependent induction o...
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Giant Energy Harvesting via Maxwell Displacement Current Enhancement Using Metal Sheet Interspaced Hetero-Layer Structured Piezo-Composite Nanofiber Device
2023 / Advanced Functional MaterialsThe limited performance of piezoelectric nanogenerators (PENGs) has hindered their practical applications in self-powered electronics. To address these limitations, this study presents a new design of a PENG that incorporates hetero-layer structured piezo-composite nanofibers with interspaced metal sheets. The hetero-layer structure consists of alternating layers...
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Thermally induced atomic reconstruction into fully commensurate structures of transition metal dichalcogenide layers
2023 / Nature MaterialsTwist angle between two-dimensional layers is a critical parameter that determines their interfacial properties, such as moiré excitons and interfacial ferro-electricity. To achieve better control over these properties for fundamental studies and various applications, considerable efforts have been made to manipulate twist angle. However, due to mechanical...
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