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Merreta Noorenza Biutty,Maulida Zakia,유성일 대한화학회 2020 Bulletin of the Korean Chemical Society Vol.41 No.10
One-dimensional assemblies of metal nanoparticles (NPs) may represent an interesting plasmonic superstructure, in which localized surface plasmon resonance of individual NPs can be coupled to modify the strength and wavelength of extinction of metal NPs. In this study, we explored a simple method to assemble Au NPs into a linear chain by utilizing a low-dielectric solvent and salts. The aggregation states of Au NPs were engineered by the concentration of salts, which resulted in isolated and linearly assembled Au NPs. In addition, the TiO2 shell, as a stabilizing layer, was synthesized on the surface of the isolated and assembled Au NPs by a slow hydrolysis process. Because the linearly assembled Au NPs with a TiO2 shell had a broad extinction spectrum by plasmon hybridization, they could absorb more photons under simulated solar irradiation. As a result, the linearly assembled Au NPs with a TiO2 shell exhibited an enhanced photothermal effect, compared with the isolated ones.
( Biutty Merreta Noorenza ),( Maulida Zakia ),유성일 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.1
Triboelectric nanogenerator (TENG) have attracted great attention as a new energy generation for scavenging mechanical energy because of their high efficiency. The enhancement of TENG’s performance can achieve by material modifications, such us flexibility, functionally surface and dielectric constant. In this regards, we design TENG using modification of sponge polydimethylsiloxane (PDMS) with polydopamine (PDA) and gold nanoparticle (Au NPs) as effective dielectric. By using sugar templates, the flexible sponge-structured PDMS has been successfully fabricated. Furthermore, we introduced a facile path for surface modification in which self-polymerization of dopamine through simple dip-coating method. In the presence of catechol and N-H groups, Au NPs can chemically attached to the pore of PDMS sponge. With this structure (PDMS sponge/PDA/Au NPs), the TENG’s output voltage and current are enhanced by several times compared with only PDMS sponge, PDMS /PDA and PDMS sponge/Au NPs.
Merreta Noorenza Biutty,유성일 한국고분자학회 2021 Macromolecular Research Vol.29 No.1
Based on the contact electrification and electrostatic induction, triboelectric nanogenerators (TENGs) can convert the ambient mechanical energy into an electrical one. Having a role as both an energy storage and an output device, the enhancement of the TENG performance can be achieved by increasing their capacitance. Since the capacitance of tribo-materials can be engineered by their thickness and dielectric constant, we attempted to produce porous polydimethylsiloxane (PDMS) composites with Au nanoparticles (NPs) to engineer the capacitance. To this end, PDMS elastomers with various pore sizes were produced using sugar particles with a range of grain sizes. Then, the hydrophobic surface of PDMS elastomer was coated with polydopamine (PDA) to promote the homogeneous deposition of hydrophilic Au NPs on the PDMS surface. By using PDMS/PDA/Au composites, here we show the importance of pore size in adjusting the capacitance of the tribo-material. In particular, decoration of the PDMS surface with Au NPs engineered the dielectric constant of PDMS/ PDA/Au composites, while the introduction of pores reduced the thickness of the composites under external pressure. Consequently, PDMS/PDA/Au composites exhibited enhanced TENG performance in a pore-size dependent manner.
Tissasera Iseki,Merreta Noorenza Biutty,박철호,유성일 한국고분자학회 2023 Macromolecular Research Vol.31 No.3
The salinity gradient between seawater and river water is a type of Gibbs energy that can be converted into electrical energy by an ion-exchange membrane. Although the salinity gradient between two aqueous solutions can be adjusted in a laboratory to improve the energy-harvesting performance, the salinity gradient in natural resources is rather constant, restricting the prospects of membrane-mediated power generation. To address this issue, we demonstrate the local enhancement of the salinity gradient through hydrogel-functionalized anodic aluminum oxide (AAO) membranes. In the composite structure, the surface-modified AAO membrane attracts the mobile counter ions from the hydrogels to increase the local concentration of mobile ions inside the nanopores of AAO membrane. Owing to the local concentration enhancement, the hydrogel-functionalized AAO membranes could extract electrical energy with improved efficiency, which could power small electronic devices.