Article
Chemistry, Physical
Tamasgen Fikadu Yadeta, Toyoko Imae
Summary: The carbon quantum dot (C-dot) acts as a photosensitizer and dye-adsorber. Adding C-dot to TiO2/NiO(10 wt%) nanocomposites significantly enhances the power conversion efficiency (PCE) of dye-photosensitized solar cells (DSSCs) up to 2.88 times. However, in TiO2/CuO/C-dot nanocomposites, the addition of C-dot leads to a decrease in PCE.
APPLIED SURFACE SCIENCE
(2023)
Article
Chemistry, Physical
Milad Sabzehparvar, Fatemeh Kiani, Nooshin Salman Tabrizi
Summary: This study presents a magnetically-recyclable TiO2-NiO-Ag p-n/Schottky heterojunction photocatalyst with enhanced photocatalytic activity, showcasing its potential for practical application in environmental remediation and other photocatalytic applications.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Multidisciplinary
Junaid Khan, Gohar Ali, Ayesha Samreen, Shahbaz Ahmad, Sarfraz Ahmad, Mehmet Egilmez, Sadiq Amin, Nadia Khan
Summary: In this study, a low-cost pseudo successive ionic layer adsorption and reaction technique was used to deposit CdS quantum dots on hierarchical NiO, forming an effective NiO/CdS p-n heterojunction system. The synthesized heterojunction photocatalyst showed improved photocatalytic activity due to enhanced charge carrier separation and transport compared to standalone NiO.
Article
Environmental Sciences
Nahee Kim, Mumtaz Ali, Hassan Anwer, Jae -Woo Park, Iqra Irfan
Summary: In this study, a p-n junction catalyst (NiO/TiO2) was grown on a stainless-steel mesh (SSM) support using a hydrothermal method. The resulting composite exhibited superior morphology compared to previously reported catalysts. The photocatalytic activity of the composite was evaluated by measuring the degradation of bisphenol A (BPA), and SSM@NiO/TiO2 achieved the highest degradation rate, demonstrating excellent reusability potential.
Article
Engineering, Electrical & Electronic
Prasenjit Deb, Sudem Daimary, Priyanka Chetri, Jay Chandra Dhar
Summary: The glancing-angle deposition technique was used to fabricate a vertical array of titanium dioxide nanowires on a p-type silicon substrate. The structural formation, crystalline nature, and recombination states of the nanowires were studied using various characterization techniques. The fabricated device showed low dark current, high responsivity, and good performance as a photodetector, making it a promising candidate for applications in this field.
JOURNAL OF ELECTRONIC MATERIALS
(2022)
Article
Chemistry, Physical
Zikun Liang, Bo Ouyang, Tongyu Wang, Xuan Liu, Hailing Huo, Dong Liu, Hao Feng, Jingjing Ma, Kaiming Deng, Ang Li, Erjun Kan
Summary: Efficient charge separation is crucial for semiconductor-based solar energy conversion. This study overcame the limitation of reaction barrier in p-n junction by carefully designed cocatalyst loading, achieving the full effectiveness of p-n junction. The well-designed catalyst exhibited excellent photocatalytic activity in water splitting, with a hydrogen evolution rate 18 times higher than that of the pristine p-n junction.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Chemistry, Physical
Fahrettin Sarcan, Umit Dogan, Ahmad Althumali, Hari B. Vasili, Leonardo Lari, Adam Kerrigan, Furkan Kuruoglu, Vlado K. Lazarov, Ayse Erol
Summary: This study reports the electrical and optical properties of a novel NiO-based homojunction p-i-n photodiode. The photodiode exhibits diode characteristics and a constant photoresponse under reverse bias. The responsivity of the photodiode is determined to be 295 mA/W at 3.9 eV.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Physical
Dewen Zheng, Heng Zhao, Shanyu Wang, Jinguang Hu, Zhangxin Chen
Summary: Photocatalytic water splitting for hydrogen production is a promising strategy to tackle energy crisis and environmental pollution. Utilizing p-n heterojunction in photocatalyst design can enhance hydrogen evolution activities by improving charge separation efficiency. The preparation methods for NiO-TiO2 composites have a significant impact on the efficiency of photocatalytic hydrogen production.
Article
Engineering, Electrical & Electronic
Michael Cholines Pedapudi, Jay Chandra Dhar
Summary: The effects of annealing on the performance of GLAD synthesized vertical p-NiO/n-beta-Ga2O3 heterostructure nanowire arrays based UV photodetector were investigated. The analysis showed that the sample annealed at 800 degrees C exhibited improved crystallinity and reduced defect levels, resulting in the largest responsivity and fast response speed. However, above 800 degrees C, crystallographic defects were formed, degrading the sample's performance.
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
(2023)
Article
Engineering, Electrical & Electronic
Senol Kaya, Ugur Soykan, Mustafa Sunkar, Seda Karaboga, Muhsin U. Dogan, Rifki Terzioglu, Gurcan Yildirim, Cabir Terzioglu
Summary: The influences of annealing temperatures on the electrical characteristics of a p-NiO/n-TiO2 heterojunction diode were investigated, with a focus on changes in microstructure, morphology, and surface chemistry of the p-NiO/n-TiO2 films. It was found that the annealing temperature affected the stress variations in the films and the crystallization of the TiO2 layer, leading to the formation of grain structures. The study also revealed that annealing temperature played a significant role in the rectifying behavior, barrier potential, and ideality factor of the diode, with the most favorable results achieved at 400 degrees C.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2023)
Article
Chemistry, Multidisciplinary
Mohamed Zayed, Salsbeel Samy, Mohamed Shaban, Abeer S. Altowyan, Hany Hamdy, Ashour M. Ahmed
Summary: By controlling the weight ratio of NiO NPs, loading NiO nanoparticles into TiO2 nanotubes can reduce the recombination of photo-induced electron/hole pairs and enlarge the solar spectral response range, thereby improving the photocatalytic activity.
Article
Chemistry, Multidisciplinary
Antonio Carone, Pablo Mariani, Anthony Desert, Marco Romanelli, Jacopo Marcheselli, Marco Garavelli, Stefano Corni, Ivan Rivalta, Stephane Parola
Summary: Chiral plasmonic nanomaterials have promising applications. This study expands the range of available chiral plasmonic nanostructures and proposes the importance of the outer part of the nanoparticles shell on plasmonic circular dichroism.
Article
Nanoscience & Nanotechnology
Stanislav O. Gurbatov, Evgeny Modin, Vladislav Puzikov, Pavel Tonkaev, Dmitriy Storozhenko, Aleksandr Sergeev, Neli Mintcheva, Shigeru Yamaguchi, Natalie N. Tarasenka, Andrey Chuvilin, Sergey Makarov, Sergei A. Kulinich, Aleksandr A. Kuchmizhak
Summary: The rational combination of plasmonic and all-dielectric concepts within hybrid nanomaterials provides a promising route toward devices with ultimate performance and extended modalities. Fabricated hybrids with amorphous TiO2 nanospheres decorated and doped with Au nanoclusters demonstrate remarkable light-absorbing properties in the visible and near-IR spectral range, and were utilized to demonstrate applications such as a catalytically passive SERS biosensor and a solar steam generator.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Engineering, Environmental
Spela Slapnicar, Gregor Zerjav, Janez Zavasnik, Matjaz Finsgar, Albin Pintar
Summary: This study investigated the plasmonic Au (1 wt%) catalysts on hydrothermally synthesized TiO2 nanorods. Different sizes of Au nanoparticles (Au NPs) on Au/TiO2 catalysts were obtained by adjusting the mixing duration and calcination parameters. The presence of localized surface plasmon resonance effect was observed in all UV-Vis diffuse reflectance spectra of the catalysts, regardless of the size of Au particles. The study also identified superoxide anion radicals (O2 & BULL;-) as the main reactive oxygen species responsible for the oxidation of bisphenol A (BPA) under visible-light illumination.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2023)
Article
Optics
Lijie Wang, Tsz Him Chow, Malte Oppermann, Jianfang Wang, Majed Chergui
Summary: We report on the deep-to-near-UV transient absorption spectra of Au/SiO2 and Au/TiO2 core-shell nanoparticles (NPs) and UV-excited bare anatase TiO2 NPs. The presence of electrons/holes in the conduction/valence band of the material is indicated by the bleaching of the first excitonic transition of anatase TiO2 at -3.8 eV. Two-photon excitation does not occur in bare TiO2 NPs, but takes place in the TiO2 shell of Au/TiO2 core-shell NPs due to plasmon resonance enhancement. The bleach of the 3.8 eV band of TiO2 lives significantly longer in the core-shell NPs, indicating longer storage of excess electrons/holes.
PHOTONICS RESEARCH
(2023)
Article
Chemistry, Multidisciplinary
Shuai Zu, Quan Sun, En Cao, Tomoya Oshikiri, Hiroaki Misawa
Summary: By studying gold nanorods, the spatiotemporal origin of plasmonic chiroptical responses was revealed, promoting a full understanding of the ultrafast chiral origin in complex nanostructures. This research opens a way to design chiroptical nanophotonic devices for spatiotemporal control of chiral light-matter interactions.
Article
Chemistry, Multidisciplinary
Tomoya Oshikiri, Haruki Jo, Xu Shi, Hiroaki Misawa
Summary: This study utilized the concept of modal strong coupling between metal nanoparticles and a nanocavity to enhance the efficiency of hot-hole injection. The results showed that the hybrid modes of the modal strong coupling system promoted hot-hole injection and proton/water reduction by hot electrons over a broad wavelength range.
CHEMISTRY-A EUROPEAN JOURNAL
(2022)
Article
Chemistry, Multidisciplinary
Yusuke Ueda, Yusuke Masuda, Tomohiro Iwai, Keisuke Imaeda, Hiroki Takeuchi, Kosei Ueno, Min Gao, Jun-ya Hasegawa, Masaya Sawamura
Summary: We present a copper-catalyzed enantioselective umpolung allylic acylation reaction under visible light. The reaction involves the use of acylsilanes as acyl anion equivalents and is supported by triplet-quenching experiments and DFT calculations. The reaction mechanism involves a charge-separated triplet state intermediate generated by copper-to-acyl metal-to-ligand charge transfer photoexcitation.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2022)
Article
Multidisciplinary Sciences
Giles Allison, Amrita Kumar Sana, Yuta Ogawa, Hidemi Kato, Kosei Ueno, Hiroaki Misawa, Koki Hayashi, Hironori Suzuki
Summary: Surface plasmon resonance technology is commonly used for detecting binding kinetics in biological samples, but is often limited by complex optical detection methods. This study introduces an optoelectronic approach where a plasmonic sensor integrated in a photovoltaic cell can generate an electronic signal sensitive to the refractive index of a solution through plasmon interaction. This near-field electrical detection of surface plasmon resonance shows promise for the development of next generation cost-effective, compact, and high throughput biosensors.
NATURE COMMUNICATIONS
(2021)
Article
Materials Science, Multidisciplinary
Hiroki Ago, Susumu Okada, Yasumitsu Miyata, Kazunari Matsuda, Mikito Koshino, Kosei Ueno, Kosuke Nagashio
Summary: The past decades of materials science discoveries have laid the foundation for our present society. The recent discovery of graphene and other 2D materials offers a novel approach to synthesizing materials and exploring new physics and chemistry.
SCIENCE AND TECHNOLOGY OF ADVANCED MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Chiaki Kojima, Akemi Noguchi, Tatsuya Nagai, Ken-ichi Yuyama, Sho Fujii, Kosei Ueno, Nobuaki Oyamada, Kei Murakoshi, Tatsuya Shoji, Yasuyuki Tsuboi
Summary: Membrane fusion is an important and ubiquitous process in living organisms. This study developed a novel method for liposome fusion based on laser-induced bubble generation on gold surfaces, creating ultralong tubes similar to sea anemones. The behavior of the tubes was monitored using fluorescence microscopy, and the generation of these tubes was discussed in relation to Marangoni convection and thermophoresis.
Article
Multidisciplinary Sciences
Pedro Paulo Ferreira da Rosa, Yuichi Kitagawa, Sunao Shoji, Hironaga Oyama, Keisuke Imaeda, Naofumi Nakayama, Koji Fushimi, Hidehiro Uekusa, Kosei Ueno, Hitoshi Goto, Yasuchika Hasegawa
Summary: Soft-crystal copolymerization of Tb(III) and Dy(III) complexes is achieved, and long-range energy transfer from one crystal to the other is studied.
NATURE COMMUNICATIONS
(2022)
Article
Chemistry, Multidisciplinary
Yaguang Wang, Xu Shi, Tomoya Oshikiri, Hiroaki Misawa
Summary: We fabricated a novel photoanode structure that efficiently enhances light absorption and electron transfer through modal strong coupling, enabling water splitting at zero bias potential.
NANOSCALE ADVANCES
(2022)
Article
Chemistry, Physical
Xiaoqian Zang, Xu Shi, Yoshiki Suganami, Yen-En Liu, Tomoya Oshikiri, Hiroaki Misawa
Summary: In this study, a strong coupling photoelectrode with localized surface plasmon resonance (LSPR) and Fabry-Perot (FP) nanocavity was fabricated to investigate the enhancement mechanism of plasmon-induced chemical reactions. The efficient water oxidation on the strong coupling electrode was considered a result of quantum coherence between the Au-Ag alloy nanoparticles through the nanocavity. In situ electrochemical surface-enhanced Raman spectroscopy was used to detect the intermediates of water oxidation and showed a more negative onset potential on the strong coupling electrode.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Chemistry, Physical
Chih-Hao Huang, Ya-Chiao Lee, Tetsuhiro Kudo, Xu Shi, Kosei Ueno, Teruki Sugiyama, Hiroaki Misawa, Hiroshi Masuhara
Summary: In this study, optical trapping with fabricated gold nanodisk arrangement was used to observe the trapping and arrangement of gold nanoparticles between the nanodisks, as well as the bidirectional and unidirectional swarming behavior of the nanoparticles. These findings provide valuable insights into optical manipulation techniques coupled with fabricated nanostructures, expanding the possibilities for optical trapping and related research.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Chemistry, Multidisciplinary
Bhagyashree Mahesha Sachith, Zhijing Zhang, Palyam Subramanyam, Challapalli Subrahmanyam, Akihiro Furube, Naoto Tamai, Takuya Okamoto, Hiroaki Misawa, Vasudevanpillai Biju
Summary: Bandgap-engineered inorganic and hybrid halide perovskite materials have shown great promise for solar cells, but fluctuations in the photoinduced electron transfer (PET) rates can affect their performance. In this study, we investigated the fluctuations of interfacial PET in perovskite-based donor-acceptor systems at both single-particle and ensemble levels. By analyzing the Gibbs free energy changes and studying the dynamics of PET, we gained insights into the charge separation mechanisms in these systems. Our findings provide valuable information for optimizing the design and performance of perovskite solar cells.
Review
Chemistry, Multidisciplinary
Yuto Kitajima, Hiyori Sakamoto, Kosei Ueno
Summary: This review discusses recent studies on coupled plasmonic systems for controlling plasmon dynamics and molecular detection using spectral modulations. The plasmon dephasing time can be controlled by weak and strong coupling regimes between plasmonic nanostructures or localized surface plasmon resonances (LSPRs) and other optical modes, such as microcavities. Modal coupling extends the plasmon dephasing time, enhancing near-field enhancement at specific wavelengths for improved molecular detection.
Article
Chemistry, Multidisciplinary
Yanfeng Cao, Xu Shi, Tomoya Oshikiri, Shuai Zu, Yuji Sunaba, Keiji Sasaki, Hiroaki Misawa
Summary: Near-field engineering was conducted on an Au-NP/TiO2/Au-film (ATA) photoanode to improve water oxidation efficiency, resulting in approximately 1.3-fold higher average photocurrent conversion efficiency compared to the original design.
CHEMICAL COMMUNICATIONS
(2021)
