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Repeated disordered structure for radiative cooling application via scalable stamping method from designed CaCO3 templates
(2026-07-01)
Kaewmanee, Taweesak
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Sakata, Patawee
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Gridtayawong, Pharit
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Rueangsawang, Worawut
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Ponghiransmith, Chattrarat
Radiative cooling via micro-patterned surfaces provides energy-efficient solution for thermal regulation by enhancing selective thermal emission within the atmospheric transparency window (8–13 μm). This study investigates the effects of microstructural patterning through a low-cost and scalable stamping technique. The patterning templates were uniquely produced by the removal of randomly-distributed CaCO<inf>3</inf> polymorphs—calcite and vaterite with specific sizes. The novel calcite-imprinted structures exhibit superior mid-infrared emissivity (>0.96) and maintain consistent temperature reduction across varying weather conditions, outperforming vaterite-based films. However, the cooling performance of unmodified patterns is limited by solar absorption. To address this, TiO<inf>2</inf> (rutile phase) is incorporated into a polymer matrix before being stamped to enhance solar reflectivity. Moreover, hydrophobic aerogels could be inserted between micropattern gaps to facilitate self-cleaning functionality. A composite film containing 3 wt% TiO<inf>2</inf> with the calcite micro-patterning and hydrophobic aerogel achieves a temperature drop of 4.8 °C, compared to 1.2 °C of pristine patterns relative to that of a clear film. For real-world applicability, the optimized patterning strategies were further validated on fiber cement rooftile surfaces, yielding best temperature reductions of 2.5 °C compared to pattern-free coating under a tropical climate. The calculated net cooling power of 3 wt% TiO<inf>2</inf> patterned film with aerogel is 26.9 W/m2. This novel passive-cooling stamping strategy is low-cost, scalable, and suitable for large-area deployment, reducing the energy burden of active cooling technologies.
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An architected silk fibroin-lignin multilayer with deep-level trapping states for high-output triboelectric nanogenerators
(2026-03-01)
Suktep, Natdanai
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Sae-tang, Chanachot
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Ukasi, Sirinya
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Pakawanit, Phakkhananan
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Supansomboon, Supitcha
Biopolymer-based triboelectric nanogenerators (B-TENGs) are promising power sources for sustainable and flexible electronics, but their performance is often limited by severe charge recombination at the triboelectric interface. To overcome this critical bottleneck, we report an architected multilayer B-TENG featuring a silk fibroin (SF)/MgAl LDH composite as the charge-generating layer and, to our knowledge, for the first time, a lignin-functionalized SF film as a dedicated charge-trapping layer. The strategic incorporation of lignin, an abundant and sustainable biopolymer, introduces deep-level electronic trapping states originating from its abundant aromatic moieties. That effectively suppresses interfacial charge recombination and prolongs charge lifetime. By optimizing the contents of MgAl LDH and lignin, the device achieves a measured open circuit output voltage ( V <inf> OC </inf>) and current density ( J <inf> SC </inf>) of 96 V and 6.56 μA/cm3, with a maximum output power ( P <inf> max </inf>) of 205 μW, corresponding to a power density of 22.7 μW/cm2. We also propose a mechanistic linking of deep-level traps to prolonged charge lifetime and increased net transferable charge. The interface-engineering strategy demonstrated here paves the way for developing high-performance and sustainable biopolymer-based TENGs and motion sensors.
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A highly sensitive disease pre-screening approach for glycosuria: Triboelectric sensing at the liquid-solid interface
(2025-03-15)
Pharino, Utchawadee
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Chaithaweep, Kanokwan
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Pongampai, Satana
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Chanlek, Narong
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Kothan, Suchart
Prescreening and disease detection offer significant benefits in the prevention of serious illnesses. Traditional screening methods for disease identification have been complex and expensive, often requiring invasive procedures, which can be both harmful and uncomfortable. To address these limitations, various non-invasive screening technologies have been developed. Among recent innovations, the liquid–solid interface concept has emerged as a promising avenue for nanogenerator applications, enabling the harvesting and sensing of liquid energy and substances. In this study, we introduce a liquid–solid interface triboelectric sensor (LS-TES) for non-invasive disease screening and sensing. The LS-TES, utilizing a double-electrode configuration, delivers an immediate electrical response upon droplet contact with the solid surface and top electrode. In the case of urine glucose monitoring, our findings demonstrate a significant reduction in electrical signals with increasing concentrations of glucose, as glucose molecules hinder electron transfer from water to the solid surface, thereby disrupting the formation of the electrical double layer at the liquid–solid interface. The sensor exhibits excellent glucose sensing performance within a concentration range of 0.2 mM to 14 mM, with a detection limit of 0.25 mM and a rapid response time of 5–10 s. The LS-TES is cost-effective, highly stable, and reusable, maintaining consistent electrical responses across ten cycles of alternating droplet measurements. This work presents a preclinical assessment approach, specifically for urine glucose monitoring, utilizing an innovative sensor based on the liquid–solid interface. The proposed concept has the potential to serve as an individual indicator for early medical symptom detection, offering relief to a large number of patients.
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Preface
(2025-02-01)
Yimnirun, Rattikorn
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Kidkhunthod, Pinit
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Kaewkhao, Jakrapong
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Vittayakorn, Naratip
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D'Angelo, Paola
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White Light Emission and Judd-Ofelt Analysis of Dy3+ Doped Mixed Alkali Borate Glass for W-LEDs Material
(2023-01-01)
Jarucha, Nawarut
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Ruangtaweep, Yotsakit
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Nawarat, Poomirat
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Kanthang, Paisan
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Limsuwan, Pichet
The Dy3+ doped lithium sodium potassium borate glasses with white light-emitting were prepared by the melt quenching technique. In this work, optical, photoluminescence properties and Judd-Ofelt analysis of borate glasses have been investigated. For optical properties, Dy3+ doped glasses showed the absorption in visible and near-infrared region, which originate from 6H<inf>15/2</inf> ground state to higher state. While the luminescence properties of Dy3+ doped glasses, the emission spectra were presented more intense at 484 nm (blue light) and 574 nm (yellow light) which are essential for white light emitting materials, whilst decay time decrease with an increase of Dy<inf>2</inf>O<inf>3</inf> contents. The emission intensity of Dy3+ doped glasses were enhanced by adding Dy<inf>2</inf>O<inf>3</inf> concentrations until 0.5 mol%, after that the emission intensities were decreased due to the concentration quenching effect. Judd-Ofelt is analyzed by using the absorption and photoluminescence results, The stimulated emission cross-section has been investigated in this work. The CIE 1931 chromaticity investigation shows that Dy3+ doped glass emitted light with white color. Hence, these glasses may be suitable candidates for use in W-LEDs material.
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Preface-The 5th international conference on Smart Materials and Nanotechnology 2020 (SmartMat@2020)
(2022-10-01)
Kaewkhao, Jakrapong
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Kidkhunthod, Pinit
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Vittayakorn, Naratip
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Yimnirun, Rattikorn
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D'Angelo, Paola
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Preface
(2022-09-01)
Kaewkhao, Jakrapong
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Kidkhunthod, Pinit
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Vittayakorn, Naratip
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Yimnirun, Rattikorn
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D'Angelo, Paola
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Preface
(2021-09-20)
Thammavintorn, Preecha
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Limkaisang, Viroj
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Charoenprakdee, Anek
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Seetawan, Tosawat
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Kimura, Kaoru
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Room-temperature rapid synthesis of CuI thin films via liquid iodination method
(2020-05-01)
Posopa, Narongsak
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Sakulkalavek, Aparporn
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Chanlek, Narong
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Kaewkhao, Jakrapong
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Sakdanuphab, Rachsak
In this work, we successfully synthesised highly transparent and conducting CuI thin films at room temperature via a rapid chemical reaction between the Cu<inf>3</inf>N precursor and aqueous iodine solution. The effect of the precursor (Cu or Cu<inf>3</inf>N) on the structural, electrical, and optical properties of the CuI thin films was investigated. The X-ray diffraction results revealed that the prepared films were polycrystalline, preferentially oriented along the (111) planes of the zinc blende structure. In addition, we found that the nitrogen content of the precursor significantly affected the optical and electrical properties of the CuI films. The CuI film obtained by dipping Cu<inf>3</inf>N film into aqueous iodine solution for 1 min exhibited a conductivity of 29.36 Scm−1 and transmittance of 75% in the visible region. We expect that these findings would assist researchers to rapidly synthesise CuI thin films for transparent electronic devices.

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