Article
Engineering, Electrical & Electronic
Furkan Kokdogan, Sinan Gezici
Summary: This paper investigates a visible light positioning system where a receiver estimates the position based on signals emitted from LED transmitters. Each LED transmitter can potentially be malicious and transmit signals at an unknown power level with a certain probability. A maximum likelihood position estimator is derived based on the probabilities of malicious LED transmitters. Furthermore, decision rules are designed to detect malicious LED transmitters and various ML-based location estimators are proposed based on the detection results. The performance of the estimators is evaluated using numerical examples and compared against the Cramer-Rao lower bounds.
IEEE TRANSACTIONS ON COMMUNICATIONS
(2023)
Article
Chemistry, Applied
Xinjie Song, Shipeng Fan, Zehua Cai, Zhou Yang, Xun Chen, Xianzhi Fu, Wenxin Dai
Summary: A photothermal catalytic system, Cu/CeO2, was used to produce NH3 through the reaction of NO, CO, and H2O under visible-light irradiation. The Cu/CeO2 catalyst exhibited high conversion of NO (94.4%) and selectivity for NH3 (66.5%) in the presence of H2O at 210°C. Visible light further improved the conversion of NO (97.7%) and selectivity for NH3 (69.1%). This study offers a convenient approach for NH3 production under mild conditions.
CHINESE JOURNAL OF CATALYSIS
(2023)
Article
Chemistry, Physical
Zheng Chen, Yuanxing Fang, Long Wang, Xiaoxiao Chen, Wei Lin, Xinchen Wang
Summary: The study demonstrates the potential of Co-doped ZnO nanorods as a noble-metal-free photocatalyst for efficient water splitting under visible light illumination. The material shows a remarkable performance with high quantum yields, suggesting its promising application in harnessing sunlight for advanced photocatalytic processes.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2021)
Article
Chemistry, Physical
Tongtong Li, Shulan Wang, Li Li, Huaze Zhu, Yongqiang Yang, Gang Liu
Summary: The photocatalytic performance of polymeric carbon nitride (CN) can be improved by constructing holey carbon nitride nanosheets, which enhances light absorption and electron-hole separation, leading to higher hydrogen evolution rate and apparent quantum yield.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2022)
Article
Chemistry, Physical
Gang Cheng, Zehua Cai, Xinjie Song, Xun Chen, Wenxin Dai, Xianzhi Fu
Summary: Under a photo-thermal synergistic effect, metastable NiCo2O4 exhibited higher catalytic activity and oxygen vacancies promoted the interaction and reaction between CO and NO. Visible light irradiation further enhanced the catalytic reaction.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2022)
Article
Engineering, Chemical
Yiqiao Wang, Jianhong Ye, Bin Hu, Yu Xie, Yun Ling, Zilin Wang, Yong Chen
Summary: Photocatalytic hydrogen production is an effective solution to the energy crisis, but the slow electron-hole separation efficiency of existing photocatalysts poses a challenge. Designing a photocatalyst with high carrier separation efficiency is difficult. In this study, non-precious metal NiO is used as a co-catalyst and forms a heterojunction with ZnIn2S4 (ZIS), significantly enhancing carrier separation efficiency. The ZnIn2S4/NiO (ZIS/NiO) with a NiO mass fraction of 3% exhibits the fastest carrier separation rate and achieves a photocatalytic hydrogen production rate 6.2 times higher than pure ZIS under visible light (& lambda; & GE; 420 nm). This work provides a low-cost and high-performance co-catalyst option.
SEPARATION AND PURIFICATION TECHNOLOGY
(2023)
Article
Chemistry, Applied
Simone Battaglioli, Giulio Bertuzzi, Riccardo Pedrazzani, Jessica Benetti, Giovanni Valenti, Marco Montalti, Magda Monari, Marco Bandini
Summary: This study demonstrates the dehydrogenative functionalization of styryl carbon-carbon double bonds with triflamide via dual visible-light photoredox/cobaloxime catalysis. A variety of allylic triflamides were synthesized in moderate to good yields under stoichiometric acceptorless conditions (up to 88%). Our dedicated labelling and spectroscopic experiments provided insights into the concatenated photo- and chemo-catalytic cycles.
ADVANCED SYNTHESIS & CATALYSIS
(2022)
Article
Chemistry, Organic
Luigi Dolcini, Tommaso Gandini, Riccardo Castiglioni, Alberto Bossi, Marta Penconi, Alberto Dal Corso, Cesare Gennari, Luca Pignataro
Summary: This study investigates the use of organic photocatalysts for visible light-promoted beta-functionalization of carbonyl compounds. Donor-acceptor cyanoarenes showed the best results among the tested dyes, promoting the desired transformations in moderate to good yields. The reaction scope was explored on substrates with different steric and electronic properties, and a reductive quenching mechanism involving a transient 5 pi e(-) activation mode was proposed based on fluorescence quenching analysis.
JOURNAL OF ORGANIC CHEMISTRY
(2023)
Article
Computer Science, Information Systems
Yuan Yue, Xiaohui Zhao, Zan Li
Summary: The study proposes an indoor positioning system based on visible light fingerprinting, which accurately recovers walking paths and locates users. The system improves positioning accuracy through VL-GraphSLAM technology and fuses visible light fingerprinting and inertial sensors using a Kalman filter.
IEEE INTERNET OF THINGS JOURNAL
(2021)
Article
Engineering, Electrical & Electronic
Bassam Aly, Mohammed Elamassie, Murat Uysal
Summary: This paper investigates the application of visible light communication technology for vehicular connectivity, focusing on communication between heavy vehicles. Experimental measurements are used to propose an accurate path loss model that considers the impact of vertical displacement and oscillation. A bit error rate expression is derived for the VLC-based truck-to-truck communication system, and the effects of various system and channel parameters on performance are investigated. The proper selection of photodetector location is further studied to mitigate the degrading effects of vertical oscillation.
IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY
(2023)
Article
Chemistry, Applied
Antonietta Mancuso, Olga Sacco, Vincenzo Vaiano, Diana Sannino, Stefania Pragliola, Vincenzo Venditto, Nicola Morante
Summary: Fe-Pr co-doped TiO2 photocatalysts exhibit higher photocatalytic efficiency in the degradation of Acid Orange 7 azo dye and phenol, attributed to the co-doping of TiO2 with Pr and Fe ions leading to a reduction of the band gap value and enhanced generation of oxygen vacancies. The optimized Fe-Pr co-doped TiO2 shows the best performance in terms of treatment time under LED visible light irradiation.
Article
Chemistry, Physical
Guoqiang Deng, Xiangdong Kang, Yongqiang Yang, Lianzhou Wang, Gang Liu
Summary: In this study, skin B/N-doped red anatase TiO2 {001} nanoflakes were synthesized to overcome the limited visible light response of photocatalysts. The introduction of boron dopants and nitrogen atoms on the surface of TiO2 nanoflakes effectively shortens the charge transport path, leading to efficient visible light responsive photocatalytic activity.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2023)
Article
Multidisciplinary Sciences
Chien-Wei Cheng, Shwu-Yuan Lee, Tang-Yu Chen, Jeu-Ming P. Yuann, Chi-Ming Chiu, Shiuh-Tsuen Huang, Ji-Yuan Liang
Summary: This article presents a protocol for deactivating Staphylococcus aureus (S. aureus) using photochemical reactions involving Riboflavin-5'-phosphate (FMN) under visible light irradiation. It shows that FMN photolysis generates reactive oxygen species (ROS) which are harmful to S. aureus, and the bacterial inactivation rate increases with higher FMN concentration.
JOVE-JOURNAL OF VISUALIZED EXPERIMENTS
(2022)
Article
Chemistry, Multidisciplinary
Shaidatul Najihah Matussin, Fazlurrahman Khan, Mohammad Hilni Harunsani, Young-Mog Kim, Mohammad Mansoob Khan
Summary: In this study, irregular pentagonal CeO2 and cobalt-doped CeO2 nanoparticles were synthesized, and their structural, optical, and morphological properties were investigated. The results showed that cobalt doping enhanced the photocatalytic and photoantibacterial activities of CeO2.
Article
Environmental Sciences
Yingying Ma, Qi Peng, Meng Sun, Ning Zuo, Nchare Mominou, Shuzhen Li, Chunyu Jing, Lei Wang
Summary: Oxygen-vacancy-rich La/Co@TiO2 nanospheres were prepared for the photocalytic degradation of tetracycline using a simple two-step method. The 3 wt% La/Co@TiO2 nanospheres exhibited better photocatalytic performance for tetracycline degradation under visible light, possibly due to the synergistic effect between La/Co and TiO2 as well as the nano-confined effect. The experimental results showed complete degradation of tetracycline (40 mg/L) within 90 minutes. XPS, Raman, and photoelectrochemical results indicated the presence of appropriate oxygen vacancies on the TiO2 surface, which enhanced the activation efficiency of dissolved oxygen in the tetracycline solution. EPR and radical scavenger tests revealed that h(+), O-2(-), and center dot OH were the main active species involved in tetracycline degradation. The study also proposed a possible mechanism and intermediates for the degradation process under visible light. Therefore, La/Co@TiO2 nanospheres hold great potential as photocatalysts for wastewater treatment.
ENVIRONMENTAL RESEARCH
(2022)
Article
Biochemistry & Molecular Biology
Qian-Zhao Xu, Lukas Goett-Zink, Wolfgang Gaertner, Kai-Hong Zhao, Tilman Kottke
Article
Chemistry, Physical
Francisco Velazquez Escobar, Christa Kneip, Norbert Michael, Thomas Hildebrandt, Neslihan Tavraz, Wolfgang Gaertner, Jon Hughes, Thomas Friedrich, Patrick Scheerer, Maria Andrea Mroginski, Peter Hildebrandt
JOURNAL OF PHYSICAL CHEMISTRY B
(2020)
Editorial Material
Biochemistry & Molecular Biology
Wolfgang Gaertner
JOURNAL OF BIOLOGICAL CHEMISTRY
(2020)
Article
Chemistry, Physical
Yunmi Kim, Qian-Zhao Xu, Kai-Hong Zhao, Wolfgang Gaertner, Joerg Matysik, Chen Song
JOURNAL OF PHYSICAL CHEMISTRY B
(2020)
Review
Biochemistry & Molecular Biology
Aba Losi, Wolfgang Gaertner
Summary: Bacteria and fungi in the plant microbiota play various roles in plants, with some establishing mutually advantageous relationships while others may act as phytopathogens. Many of these microorganisms are rich in photoreceptors that can regulate growth patterns, infectivity, and pigment production in response to light. Interestingly, some fungi exhibit different behaviors towards plants depending on light conditions, switching between symbiotic and pathogenic interactions.
PHOTOCHEMICAL & PHOTOBIOLOGICAL SCIENCES
(2021)
Review
Chemistry, Multidisciplinary
Kun Tang, Hannes M. Beyer, Matias D. Zurbriggen, Wolfgang Gaertner
Summary: This review discusses the application of bilin-binding phytochromes in optogenetics and photopharmacology, highlighting their engineering improvements and diverse applications in various fields. In addition to natural and engineered phytochromes, the development of bilin-based fluorescent proteins is also discussed.
Article
Chemistry, Physical
Lisa Koehler, Wolfgang Gaertner, Joerg Matysik, Chen Song
Summary: The study found that incorporating Phytochromes (Phys) into trehalose glasses (TGs) can stabilize photoproducts, inhibit thermal reversion, and maintain the protein's structure and properties for several weeks. This method helps reveal authentic structure/function relationships of short-lived photoproducts, paving the way for a deeper understanding of the diverse spectral properties of Phytochromes.
Article
Acoustics
Francesco Garzella, Paolo Bianchini, Alberto Diaspro, Aba Losi, Wolfgang Gartner, Stefania Abbruzzetti, Cristiano Viappiani
Summary: The GAF3 domain of the cyanobacteriochrome Slr1393 can undergo photochromicity and be used for photoacoustic imaging. The light-modulatable photoacoustic waveforms arising from GAF3 can be distinguished from background signals originating from non-modulatable competitive absorbers and scattering media. This effect was verified using a phantom filled with either GAF3 or E.coli overexpressing GAF3.
Article
Biochemistry & Molecular Biology
Maria Walter, Luiz Schubert, Joachim Heberle, Ramona Schlesinger, Aba Losi
Summary: In this study, time-resolved photoacoustics (PA) was used to explore the energy landscape and volumetric changes of transient species formed after photoexcitation in biological photoreceptors. PA experiments were performed on several channelrhodopsins, revealing important parameters and providing insights into their protonation dynamics and energy levels.
PHOTOCHEMICAL & PHOTOBIOLOGICAL SCIENCES
(2023)
Article
Biochemistry & Molecular Biology
Susanne Altmayer, Lisa Koehler, Pavlo Bielytskyi, Wolfgang Gaertner, Joerg Matysik, Christian Wiebeler, Chen Song
Summary: Cyanobacteriochromes (CBCRs) are photosensory proteins that play important roles in regulating various processes in cyanobacteria. In this study, solid-state NMR spectroscopy was used to investigate the structure and dynamics of the CBCR AnPixJ. The results revealed significant structural heterogeneity of the chromophore in the photoproduct state compared to the dark state, accompanied by increased hydration of the binding pocket. A biprotonated imidazolium side-chain was also identified in the photoproduct, suggesting its involvement in the structural changes. Furthermore, pH was found to have a substantial effect on the electronic structure and protonation of the photoproduct chromophore, even with a small decrease in pH. Overall, this study provides insights into the structural and functional changes of CBCRs and their potential regulation by pH.
PHOTOCHEMICAL & PHOTOBIOLOGICAL SCIENCES
(2022)
Article
Chemistry, Physical
Yonghong Ding, Ziyue Zhao, Joerg Matysik, Wolfgang Gaertner, Aba Losi
Summary: Aromatic amino acids play a crucial role in determining the photophysical features of LOV proteins, affecting fluorescence quantum yields and lifetimes, triplet yields and lifetimes, and efficiency of singlet oxygen formation. Tryptophan and tyrosine can act as potential electron donors to the flavin excited states, while those located too close to the chromophore may reduce the yield of photoproduct formation. Adding inert phenylalanine in key positions can help in developing efficient LOV-based photosensitisers.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2021)
Article
Biochemistry & Molecular Biology
Eugenia Polverini, Florian Karl Schackert, Aba Losi
PHOTOCHEMICAL & PHOTOBIOLOGICAL SCIENCES
(2020)
Article
Chemistry, Physical
Eleonora Consiglieri, Qian-Zhao Xu, Kai-Hong Zhao, Wolfgang Gaertner, Aba Losi
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2020)