Article
Chemistry, Multidisciplinary
Chao Li, Heming Jiang, Pengxiang Liu, Yi Zhai, Xiuqin Yang, Longcheng Gao, Lei Jiang
Summary: Ion-exchange membranes are crucial in converting osmotic energy into electricity. Balancing permselectivity and ionic conductivity has always been a challenge. This study presents a membrane with minimal ion-exchange capacity that achieves ultrahigh power density in osmotic energy conversion.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2022)
Review
Chemistry, Multidisciplinary
Limin Wang, Ulrich S. Schubert, Stephanie Hoeppener
Summary: Surface modification using self-assembled monolayers has seen significant advancement in the past decade, with the introduction of new chemical reactions such as nucleophilic substitution, click chemistry, supramolecular modification, photochemical reaction, and others, enhancing the properties of solid substrates like silicon and glass.
CHEMICAL SOCIETY REVIEWS
(2021)
Article
Chemistry, Multidisciplinary
Christopher A. Petroff, Giuseppe Cassone, Jiri Sponer, Geoffrey R. Hutchison
Summary: This study presents novel piezoelectric force and touch sensors based on self-assembled monolayers of oligopeptides, which show large piezoelectric voltage response and are easily manufactured. Despite modest piezoelectric charge constants, the devices exhibit immense piezoelectric voltage constants. Additionally, a flexible device prototype with high open-circuit voltages is demonstrated, with potential for further improvements in voltage response through peptide selection and device construction.
ADVANCED MATERIALS
(2021)
Article
Engineering, Electrical & Electronic
Hsin-Yi Wen, Jian-Jie Weng, Chia-Chin Chiang
Summary: In this study, Clitoria ternatea was used for pH measurement by modifying the fiber structure and applying a nanogold coating, resulting in enhanced sensitivity and stability.
IEEE SENSORS JOURNAL
(2021)
Article
Engineering, Electrical & Electronic
Like Li, Ya-Nan Zhang
Summary: The fiber-optic pH sensor proposed in this study utilizes layer-by-layer self-assembly and surface plasmon resonance technology to achieve high sensitivity of 32.31 nm/pH. It can detect pH values in the range of 3.18 to 11.84, with confirmed stability, repeatability, and hysteresis characteristics.
IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT
(2021)
Article
Chemistry, Analytical
Shaoyong Cai, Qiang Zhang, Cheng Chen, Jinglu Wang, Baoying Lin, Xijing Liu, Xinyu Sun, Xinghai Liu, Liangzhe Chen
Summary: In this study, Zntpp particles are anchored on the PPy network to form a Pzt sensor with wrinkle-like nanostructure. The Pzt sensor demonstrates outstanding response towards ammonia with short response/recovery time. It has good durability and stability and can detect trace ammonia in livestock farming. A wireless sensor device is also developed to precisely read concentration information in real-time using a smartphone, showing great application prospects in the field of livestock farming.
SENSORS AND ACTUATORS B-CHEMICAL
(2024)
Article
Chemistry, Multidisciplinary
Dennis Meier, Abhishek K. Adak, Peter Knecht, Joachim Reichert, Sourav Mondal, Nithin Suryadevara, Senthil Kumar Kuppusamy, Keitaro Eguchi, Matthias K. Muntwiler, Francesco Allegretti, Mario Ruben, Johannes V. Barth, Shobhana Narasimhan, Anthoula C. Papageorgiou
Summary: Tailored nano-spaces can control enantioselective adsorption and molecular motion through the spontaneous assembly of a dynamic system on Ag(111) using 2,6-bis(1H-pyrazol-1-yl)pyridine-4-carboxylic acid. The network cavity snugly hosts the chemically modified guest, bestows enantiomorphic adsorption, and allows selective rotational motions. Hydrogen bonding plays a crucial role in stabilizing the rotating guest and influencing the energy landscape formation.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2021)
Article
Chemistry, Multidisciplinary
Xiao Wang, Jiefei Wang, Jinghan Wang, Yong Zhong, Lulu Han, Jiliang Yan, Pengcheng Duan, Bingyang Shi, Feng Bai
Summary: The study developed a responsive carrier-free noncovalent self-assembly strategy to prepare a metallized anticancer nanodrug, which exhibited enhanced photothermal effect, leading to drug release in tumorous acidic microenvironments. The released drug induced intracellular reactive oxygen species (ROS) increase via thioredoxin reductase (TrxR) inhibition for synergistic chemo-photothermal therapy of tumors.
Article
Nanoscience & Nanotechnology
Xuezheng Guo, Yijie Shi, Peilin Liu, Yanqiao Ding, Bingsheng Du, Chengyao Liang, Wen Niu, Yiling Tan, Yuhui He, Jiangzhao Chen, Xiangshui Miao, Xi Yang, Yong He
Summary: Explosives are often stored in low temperature and high humidity conditions to prevent electrostatic sparking, which hinders gas detection. This study synthesized APTES-SnSe2 nanosheets for a room-temperature NO2 sensor with improved sensitivity and humidity tolerance. The stronger adsorption of APTES molecules to NO2 molecules and stable adsorption energy in the presence of H2O contribute to the enhanced sensing capabilities. The APTES-SnSe2 sensor accurately detects photolytic gases from trace nitro explosives at room temperature and various humidity levels.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Analytical
Xiaohui Niu, Simeng Yan, Rui Zhao, Sha Han, Kunjie Cao, Hongxia Li, Kunjie Wang
Summary: Chirality is important in natural and life sciences, and chiral materials are widely used for electrochemical chiral recognition. Carbon quantum dots have shown potential as a novel carbon nanomaterial due to their unique properties. Self-assembly of achiral porphyrins induced by chiral carbon quantum dots was demonstrated, and the resulting structure showed good electrochemical chiral recognition properties. This research provides a new approach for synthesizing chiral composites and expanding the applications of electrochemical chiral recognition.
Article
Chemistry, Multidisciplinary
Shakil N. N. Afraj, Chun-Hsiao Kuan, Jian-Sing Lin, Jen-Shyang Ni, Arulmozhi Velusamy, Ming-Chou Chen, Eric Wei-Guang Diau
Summary: Four X-shaped quinoxaline-based organic dyes, PQx (1), TQx, (2), PQxD (3), and TQxD (4), are developed as p-type self-assemble monolayer (SAM) for tin perovskite solar cells (TPSC). The thermal, optical, and electrochemical properties of these SAMs are thoroughly investigated. Tin perovskite layers are successfully deposited on these SAM surfaces using a two-step approach, and the achieved device performance follows the order of TQxD (8.3%) > TQx (8.0%) > PQxD (7.1%) > PQx (6.1%). Among them, TQxD (4), with a thiophene pi-extended conjugation unit in the SAM structure, exhibits the highest hole extraction rates, greatest hole mobilities, and slowest charge recombination, leading to the best reported efficiency of 8.3% for SAM-based TPSC. Moreover, all devices except PQx show good enduring stability, retaining approximately 90% of their original values after 1600 hours of shelf storage.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Katarina Marusic, Ena Pezic, Nives Matijakovic Mlinaric, Pavo Dubcek, Jordi Sancho-Parramon, Damir Kralj, Branka Mihaljevic
Summary: Self-assembled monolayers (SAMs) are an important element of modern nanotechnology and surface functionalization. However, their application is limited due to their vulnerability in corrosive environments. This study demonstrates for the first time how to strongly crosslink SAMs made of non-toxic and biodegradable fatty acids on metal surfaces using ionizing radiation, resulting in stable crosslinked nanocoatings with significantly improved properties compared to SAMs. Crosslinking opens up the possibility of using SAMs in various systems and on different materials for achieving stable and durable surface properties.
Article
Optics
M. S. Aziz, M. S. Shamsudin, M. A. S. A. Fahri, A. Syuhada, R. K. Raja Ibrahim, H. Bakhtiar, S. W. Harun
Summary: Optical fibre-based sensing technology is an emerging field in photonics. In this research, a specific method of developing a sensor is demonstrated. The sensor is fabricated using flame-brush technique on multimode fibre and coated with glucose oxidase for optimization.
Article
Chemistry, Analytical
Rahul Kumar, Hien Nguyen, Bruno Rente, Christabel Tan, Tong Sun, Kenneth T. Grattan
Summary: In this study, a portable optical fiber-based sensor for monitoring pH in microfluidic channels was developed. The sensor showed good performance and could be easily integrated with microfluidic systems.
Review
Biochemistry & Molecular Biology
Caroline R. Basso, Bruno P. Crulhas, Gustavo R. Castro, Valber A. Pedrosa
Summary: Functional nanomaterials have been attracting attention for producing diverse structures in various fields. These materials have great potential applications in medicine, electronics, and energy, offering numerous unique properties. Through methods like self-assembly, nanostructures can be synthesized and utilized for similar purposes. This review focuses on recent advances in the field, discussing the fabrication and characterization of these materials, which can further be applied in optical, magnetic, electronic, and sensor fields.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2023)
Article
Optics
S. C. Burd, J. -P. Penttinen, P. -Y. Hou, H. M. Knaack, S. Ranta, M. Maki, E. Kantola, M. Guina, D. H. Slichter, D. Leibfried, A. C. Wilson
Summary: This article presents two systems based on vertical-external-cavity surface-emitting lasers (VECSELs) that can generate ultraviolet laser light at 235 and 313 nm wavelengths, suitable for quantum information processing with trapped beryllium ions. Each system includes a compact, single-frequency, continuous-wave VECSEL that produces high-power near-infrared light and can be tuned over tens of nanometers. One system produces 2.4 W of power at 940 nm, which is converted to 54 mW of 235 nm light for photoionization of neutral beryllium atoms. The other system uses a gain mirror based on GaInNAs/GaAs quantum wells, extending the wavelength above 1200 nm with manageable strain in the GaAs lattice, and generates 1.6 W at 1252 nm, which is converted to 41 mW of 313 nm light for laser cooling of trapped 9Be+ ions and quantum state preparation and detection. The 313 nm system is also suitable for implementing high-fidelity quantum gates.
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS
(2023)
Article
Engineering, Electrical & Electronic
Omer Donmez, Mustafa Aydin, Selman Mutlu, Janne Puustinen, Joonas Hilska, Mircea Guina, Ayse Erol
Summary: We present experimental and analytical results on hot electron transport in as-grown and annealed n-type modulation-doped Al0.15Ga0.85As/GaAs0.96Bi0.4 quantum well structures. The drift mobility and velocity of the annealed sample are lower due to the increased 2D electron density caused by annealing. Hot electron transport occurs in parallel mode, and inter-valley transfer dominates at higher electric fields.
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
(2023)
Article
Optics
Nouman Zia, Samu-pekka Ojanen, Jukka Viheriala, Eero Koivusalo, Joonas Hilska, Heidi Tuorila, Mircea Guina
Summary: This paper presents a hybrid laser that combines GaSb-based semiconductor gain chips with Si3N4 photonic integrated circuits. The low-loss features of Si3N4 waveguides are utilized to integrate a tunable Si3N4 Vernier mirror. The laser exhibits a maximum output power of 15 mW and a tuning range of about 90 nm at room temperature. The low-loss performance of various Si3N4 building blocks for photonic integrated circuits is also confirmed.
Article
Energy & Fuels
Andrea Scaccabarozzi, Stefano Vichi, Sergio Bietti, Federico Cesura, Timo Aho, Mircea Guina, Federica Cappelluti, Maurizio Acciarri, Stefano Sanguinetti
Summary: We investigate the impact of quantum dot aspect ratio on the sub-gap absorption properties of GaAs/AlGaAs quantum dot intermediate band solar cells. Using droplet epitaxy, we grow AlGaAs solar cells with GaAs quantum dots, which allows for strain-free nanostructures with lattice matched materials. By varying the dot aspect ratio, we can tune the energy levels of the intermediate band, thereby altering the sub-gap absorption spectrum and charge carrier extraction. The tradeoff between thermal and optical extraction is crucial for the proper functioning of the intermediate band solar cells, with the photonic extraction mechanism from the quantum dots becoming dominant at room temperature.
PROGRESS IN PHOTOVOLTAICS
(2023)
Article
Engineering, Manufacturing
Aleksandr Andreevich Vlasov, Alp Eren Aydin, Topi Uusitalo, Jukka Viheriala, Mircea Guina
Summary: Current development trends in miniaturizing electronics and photonics systems aim to integrate a wide range of technologies, including MEMS, microfluidics, wafer level optics, and silicon photonics. On-chip integration using a silicon-photonics platform offers possibilities for addressing passive optics functionality, active optoelectronic devices, and compatibility with CMOS fabrication. However, volume manufacturing of such system-on-chip components is still in its early stage.
IEEE TRANSACTIONS ON COMPONENTS PACKAGING AND MANUFACTURING TECHNOLOGY
(2022)
Article
Engineering, Electrical & Electronic
Philipp Tatar-Mathes, Hoy-My Phung, Aaron Rogers, Patrik Rajala, Sanna Rant, Mircea Guina, Hermann Kahle
Summary: This study presents the operation of a semiconductor membrane external-cavity surface-emitting laser (MECSEL) using a gain membrane with a non-resonant cavity design. The MECSEL delivers watt-level output power, comparable to state-of-the-art results. The research shows that the design criteria for the MECSEL gain region can be relaxed compared to designs using distributed Bragg reflectors, minimizing the impact of defective Fabry-Perot micro-cavity effects.
IEEE PHOTONICS TECHNOLOGY LETTERS
(2023)
Article
Optics
Samu-Pekka Ojanen, Jukka Viheriala, Nouman Zia, Eero Koivusalo, Joonas Hilska, Heidi Tuorila, Mircea Guina
Summary: Photonic integrated circuits fabricated using a Si3N4 waveguide platform exhibit low losses in a wide wavelength region. A high-performance integrated laser with broad wavelength tunability near a 2.6 μm wavelength region is demonstrated, based on a Si3N4 photonic integrated circuit incorporating a tunable reflector and a AlGaInAsSb/GaSb quantum-well gain element. The platform also supports low propagation loss up to 3.5 μm.
LASER & PHOTONICS REVIEWS
(2023)
Article
Optics
D. Mitten, M. Hart, S. H. Warner, J. -P. Penttinen, M. Guina, Y. Kaneda
Summary: A vertical external cavity surface emitting laser (VECSEL) has been developed for a sodium guide star application. Stable single frequency operation with 21 W of output power near 1178 nm with multiple gain elements while lasing in the TEM00 mode has been achieved. This is the first demonstration of a high power single frequency VECSEL using a twisted-mode configuration and multiple gain mirrors located at the cavity folds.
Article
Physics, Applied
Y. Q. Huang, V Polojarvi, A. Aho, R. Isoaho, T. Hakkarainen, M. Guina, I. A. Buyanova, W. M. Chen
Summary: This study demonstrates the existence of nonlinear spin response in nonmagnetic materials and showcases it in a (Ga, N)As-InAs quantum dot coupled all-semiconductor nanostructure. The observed spin nonlinearity can be conveniently tuned with an external magnetic field and potentially operates at a speed exceeding 1 GHz.
PHYSICAL REVIEW APPLIED
(2023)
Article
Optics
Samu-Pekka Ojanen, Jukka Viheriala, Nouman Zia, Eero Koivusalo, Joonas Hilska, Heidi Tuorila, Mircea Guina
Summary: A discrete, tunable photonic integrated laser is demonstrated for multiwavelength spectroscopy. The laser combines a reflective semiconductor optical amplifier with a photonic integrated circuit, allowing for switching between three distinct emission wavelengths. The design simplifies the tuning mechanism compared to other hybrid lasers.
LASER & PHOTONICS REVIEWS
(2023)
Article
Chemistry, Multidisciplinary
Tristan Smolka, Michal Rygala, Joonas Hilska, Janne Puustinen, Eero Koivusalo, Mircea Guina, Marcin Motyka
Summary: The optical properties of GaSbBi layers grown on GaSb (100) substrates with different bismuth contents were investigated. The band gaps of the materials were determined using Fourier-transform photoluminescence spectra, revealing the presence of localized states connected to bismuth clustering. Time-resolved photoluminescence measurements based on single-photon counting were used to determine the characteristic photoluminescence decay time constants, which showed an increase with increasing bismuth content and clustering effects.
Article
Energy & Fuels
Janne Puustinen, Joonas Hilska, Arto Aho, Esperanza Luna, Antti Fihlman, Mircea Guina
Summary: The development of low bandgap GaAsNBi solar cells grown using MBE is reported, and the As/Ga flux ratio is found to play an important role in controlling the solar cell performance.
SOLAR ENERGY MATERIALS AND SOLAR CELLS
(2024)
Proceedings Paper
Nanoscience & Nanotechnology
Jukka Viheriala, Topi Uusitalo, Heikki Virtanen, Behzad Namvar, Patrik Rajala, Sanna Ranta, Teemu Hakkarainen, Antti Tukiainen, Guilhem Almuneau, Mircea Guina
Summary: This paper presents the development of vertical cavity surface emitting lasers (VCSELs) operating at 4.2K for energy efficient optical links between cryogenic systems and room-temperature data storage systems. The design considerations, material models, and validation of required electro-optical-thermal models are discussed. Successful operation at mA-level injection is demonstrated.
2023 IEEE PHOTONICS SOCIETY SUMMER TOPICALS MEETING SERIES, SUM
(2023)
Proceedings Paper
Computer Science, Interdisciplinary Applications
Philipp Tatar-Mathes, Hoy-My Phung, Aaron Rogers, Patrik Rajala, Sanna Ranta, Hermann Kahle, Mircea Guina
Summary: This article presents our latest research on a red-emitting semiconductor membrane external-cavity surface-emitting laser (MECSEL) for OCT applications. This technology combines near-diffraction limited beam characteristics with a wide tuning range for emission wavelength. By utilizing mass production potential and widely available CMOS sensors as detector units, the cost of OCT imaging devices can be significantly reduced without compromising image quality.
ADVANCES IN 3OM: OPTO-MECHATRONICS, OPTO-MECHANICS, AND OPTICAL METROLOGY
(2022)
Proceedings Paper
Optics
Topi Uusitalo, Jukka Viheriala, Heikki Virtanen, Santeri Hanhinen, Roosa Hytonen, Jari Lyytikainen, Mircea Guina
Summary: We have developed high peak power and brightness eye-safe lasers for automotive LIDAR. By utilizing a tapered ridge waveguide structure with highly asymmetric InGaAsP/InP epilayer, we achieved state-of-the-art peak power of 7.3 W at 50 A current. Preliminary results show that this epi-design enables higher beam brightness than traditional structures when driven with high amplitude current pulses. Further improvements in power and brightness characteristics are possible with optimized cavity layout and laser driver design.
HIGH-POWER DIODE LASER TECHNOLOGY XX
(2022)
