Article
Multidisciplinary Sciences
E. A. Tereshchenkov, E. S. Andrianov, A. A. Zyablovsky, A. A. Pukhov, A. P. Vinogradov, A. A. Lisyansky
Summary: We report on the unusual regimes of operation of a laser using a gain medium with a large Raman scattering cross-section. By analyzing the electron-phonon coupling in the medium, we find that the laser's operation can change under certain conditions, leading to self-oscillations or chaotic regimes involving coherent phonons and photons.
SCIENTIFIC REPORTS
(2022)
Article
Chemistry, Physical
Rajesh Bera, Gahyeon Kim, Dongsun Choi, Jihye Kim, Kwang Seob Jeong
Summary: Recent progress has been made in studies on the intraband photoluminescence of self-doped semiconductor nanocrystals, showing great potential for optical applications. The observation of intraband transitions in self-doped semiconductor nanocrystals is no longer limited to temporal measurements, but can also be performed under steady-state conditions. Key questions for future research mainly focus on applications.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2021)
Article
Nanoscience & Nanotechnology
David Becker-Koch, Miguel Albaladejo-Siguan, Yvonne J. Hofstetter, Olga Solomeshch, Darius Pohl, Bernd Rellinghaus, Nir Tessler, Yana Vaynzof
Summary: Efficiency of PbS quantum dot solar cells has increased, with potential for industrial applications. The use of organic layers like PTAA can improve efficiency while avoiding stability issues associated with EDT and MoO3 layers.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Chemistry, Physical
Qin Hong, Xiao-Yuan Wang, Ya-Ting Gao, Jian Lv, Bin-Bin Chen, Da-Wei Li, Ruo-Can Qian
Summary: In this study, an extreme gradient boosting (XGBoost) model is developed to guide the synthesis of fluorescent carbon dots (CDs) with high fluorescence intensity and tunable emission. The XGBoost model shows excellent performance in predicting the optical properties of CDs, and various green or blue fluorescent CDs with adjustable emission centers and solubility properties are successfully designed and fabricated. The CDs synthesized using this approach have been applied in Fe3+ detection, sustained drug release, whole-cell imaging, and polymer film preparation.
CHEMISTRY OF MATERIALS
(2022)
Article
Chemistry, Physical
Carolina Villamil Franco, Gaelle Trippe-Allard, Benoit Mahler, Christian Cornaggia, Jean-Sebastien Lauret, Thomas Gustavsson, Elsa Cassette
Summary: Investigated the exciton relaxation dynamics in strongly confined lead iodide perovskite nanoplatelets, finding a fast hot exciton relaxation process and a hot phonon bottleneck effect. Results suggest a role of the surface ligands in the cooling process.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)
Article
Chemistry, Multidisciplinary
Chujie Wang, Sri K. Matta, Chun Kiu Ng, Chang Cao, Manoj Sharma, Anthony S. R. Chesman, Salvy P. Russo, Jacek J. Jasieniak
Summary: In this article, a facile direct synthesis method of CsPbX3 perovskite nanocrystal assemblies is reported. These assemblies possess narrow and red-shifted photoluminescence, expanding the color gamut of inorganic perovskites.
Review
Chemistry, Applied
Joana F. B. Barata, M. Graca P. M. S. Neves, Paula S. S. Lacerda, Pedro Conceicao, Tito Trindade
Summary: Quantum dots (QDs) are important nanomaterials for the development of optical devices, and their non-covalent assembly with phthalocyanines (Pcs) allows for the exploration of new properties and applications. Current research mainly focuses on cadmium-containing QDs and energy transfer processes between the inorganic/organic components.
Article
Chemistry, Multidisciplinary
Jeffrey T. DuBose, Prashant Kamat
Summary: Energy and electron transfer processes play a crucial role in regulating the excited states in light harvesting assemblies for photocatalytic and optoelectronic applications. In this study, we investigated the impact of acceptor pendant group functionalization on the energy and electron transfer between CsPbBr3 perovskite nanocrystals and rhodamine-based acceptor molecules. The results showed that acceptor functionalization significantly influenced the rate of energy transfer and the competing electron transfer pathway. The findings highlight the importance of considering the structural influence of acceptor moieties for excited state interactions in nanocrystal-molecular hybrids.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Chemistry, Multidisciplinary
Yan B. Vogel, Maarten Stam, Jence T. Mulder, Arjan J. Houtepen
Summary: This article presents a strategy to actively engineer long-range charge transport in colloidal quantum dot assemblies by introducing ligand functionalities. The use of electronically coupled redox ligands enables a self-exchange chain reaction and facilitates long-range charge transport across the film. The different modes of charge transport in these assemblies and their manipulation through modulation of the Fermi level and redox ligand coverage are identified.
Article
Materials Science, Multidisciplinary
Youngsang Park, Hyoin Kim, Daekwon Shin, Taewan Kim, Mahnmin Choi, Jugyoung Kim, Doh C. Lee, Sohee Jeong
Summary: Solution-processed nanomaterials have shown remarkable progress in photovoltaics in the past decade. AgBiS2 CQDs, as environmentally friendly alternatives to lead-containing materials, have attracted attention. However, these solar cells have performed poorly in charge carrier extraction compared to lead-containing devices. By introducing a QPB interlayer at the CQD/polymer interface, the power conversion efficiency and durability of AgBiS2 CQD solar cells can be significantly improved.
ADVANCED OPTICAL MATERIALS
(2022)
Article
Optics
Qin-Qin Wang, Si-Jing Tao, Wei-Wei Pan, Zhe Chen, Geng Chen, Kai Sun, Jin-Shi Xu, Xiao-Ye Xu, Yong-Jian Han, Chuan-Feng Li, Guang-Can Guo
Summary: Identifying the general mechanics behind the equilibration of a complex isolated quantum system towards a state described by only a few parameters has been the focus of attention. In this study, the relaxation of the spin subsystem in an isolated spin-orbit coupling quantum system is experimentally investigated, and the underlying mechanism of generalized thermalization is experimentally verified for the first time.
LIGHT-SCIENCE & APPLICATIONS
(2022)
Article
Chemistry, Multidisciplinary
Jiaqi Guo, Fan Wu, Gang Song, Yuming Huang, Rongzhen Jiao, Li Yu
Summary: The study experimentally measured the spectra of plexcitonic hybrids and investigated the chirality of J-aggregates assembled on the surface of nanoparticles, revealing that the chirality of J-aggregates is related to the position on the nanorods and the quantity of dye molecules. The interaction between the longitudinal localized surface plasmon resonance (LLSPR) of the nanorods and J-aggregates achieved the strong coupling regime, leading to Rabi splitting observation.
Article
Chemistry, Multidisciplinary
Piyanan Pranee, Antoine Scalabre, Christine Labrugere, Naoya Ryu, Akira Yano, Nanami Hano, David Talaga, Yutaka Okazaki, Emilie Pouget, Sylvain Nlate, Sebastien Bonhommeau, Makoto Takafuji, Takehiko Wada, Hirotaka Ihara, Thierry Buffeteau, Dario M. Bassani, Reiko Oda
Summary: In this study, self-organised helical bilayers of dicationic gemini surfactants confined in helical silica nanospace were transformed in situ to carbon dots (CDots) through pyrolysis. These water-dispersible CDots exhibit electronic absorption spanning the UV and visible range and possess symmetrical circular dichroism (CD) signals, with the sign depending on the handedness of the helices.
CHEMICAL COMMUNICATIONS
(2023)
Article
Green & Sustainable Science & Technology
S. Akhil, J. Kusuma, R. Geetha Balakrishna
Summary: In this study, an in-situ water protocol using AgBiSe2/AgBiS2 core shell quantum dots is designed for stable solar cell devices. The cells are fabricated by SILAR method, making the device protocol highly robust. Various low-cost inorganic and solid-state hole transport materials are also investigated. IV analysis shows that the designed heterostructure enhances the power conversion efficiency up to 70%. AgBiS2 acts as an absorber and passivating layer, reducing the number of free charge carriers reaching trap states. Type-I AgBiSe2/AgBiS2 core shell QDs show least recombination, better stability, and higher quantum yield.
JOURNAL OF CLEANER PRODUCTION
(2022)
Article
Engineering, Electrical & Electronic
Rekha Mahadevu, Triloki Pandit, Jibin J. Samuel, Uddipan Ghosh, Biman Jana, Hridesh Kumar Gupta, Nagaphani Aetukuri, Anshu Pandey
Summary: We have discovered the emergence of photocapacitance in two-dimensional layered nanocrystal assemblies. By applying a lateral bias across interdigitated electrodes, we electrically probe the devices and observe capacitive current-voltage characteristics that are absent in the individual nanocrystals. In addition to a large zero-bias capacitance, the assemblies exhibit a transient negative capacitive behavior with small signal capacitance values ranging from +/- 100 nF. We demonstrate that this system behaves as a damped anharmonic oscillator and show the modulation of capacitive behavior by incident light, making these materials suitable for photocapacitive detector devices.
ACS APPLIED ELECTRONIC MATERIALS
(2023)
Article
Engineering, Electrical & Electronic
Biljana Pejova, Irina Bineva
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2015)
Article
Materials Science, Multidisciplinary
Mimoza M. Ristova, Milorad Milun, Biljana Pejova
MATERIALI IN TEHNOLOGIJE
(2015)
Article
Engineering, Electrical & Electronic
Biljana Pejova, Irina Bineva
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2016)
Article
Engineering, Electrical & Electronic
Biljana Pejova
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
(2016)
Article
Pharmacology & Pharmacy
Rozafa Koliqi, Simona Dimchevska, Nikola Geskovski, Gjorgji Petrusevski, Marina Chacorovska, Biljana Pejova, Delyan R. Hristov, Sonja Ugarkovic, Katerina Goracinova
CURRENT DRUG DELIVERY
(2016)
Article
Chemistry, Inorganic & Nuclear
Biljana Pejova
JOURNAL OF SOLID STATE CHEMISTRY
(2014)
Article
Anatomy & Morphology
Ines Musa Trolic, Zrinka Todoric, Darko Pop Acev, Petre Makreski, Biljana Pejova, Stjepan Spalj
MICROSCOPY RESEARCH AND TECHNIQUE
(2019)
Article
Engineering, Electrical & Electronic
Biljana Pejova
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2019)
Article
Metallurgy & Metallurgical Engineering
A. Petrova, G. Stefanov, S. Yaneva, G. Avdeev, A. Miteva, R. Petrov
Article
Chemistry, Physical
Biljana Pejova, Emel Sherif, Mona Wetrhus Minde
JOURNAL OF PHYSICAL CHEMISTRY C
(2020)
Article
Dentistry, Oral Surgery & Medicine
Tihana Zibar Belasic, Biljana Pejova, Helena Otmacic Curkovic, Ervin Kamenar, Bojana Cetenovic, Stjepan Spalj
Summary: After intraoral exposure, the stiffness and hardness of nickel-titanium alloy were significantly reduced, while roughness and friction were not affected. Fluorides and chlorhexidine do not increase corrosion or modify the mechanical properties of the material.
ANGLE ORTHODONTIST
(2021)
Article
Chemistry, Multidisciplinary
Katarina Smilkov, Darinka Gjorgieva Ackova, Aleksandar Cvetkovski, Nikola Geskovski, Biljana Pejova, Blazo Boev, Petre Makreski
Summary: This study synthesized silver nanoparticles using black pepper fruit extract as a bioreductive agent, followed by conjugation with piperine and characterization through various analytical methods. The research demonstrated the potential of silver nanoparticles conjugated with piperine as a promising delivery system in the pharmaceutical and biomedical industry, exploring their formation mechanisms and properties.
Article
Multidisciplinary Sciences
Anna Petrova, Georgi Stefanov, Adelina Miteva
COMPTES RENDUS DE L ACADEMIE BULGARE DES SCIENCES
(2020)
Proceedings Paper
Physics, Condensed Matter
I. Bineva, B. Pejova, V. Mihailov, A. Dinescu, M. Danila, S. Karatodorov
19TH INTERNATIONAL SCHOOL ON CONDENSED MATTER PHYSICS (ISCMP): ADVANCES IN NANOSTRUCTURED CONDENSED MATTER: RESEARCH AND INNOVATIONS
(2017)
Proceedings Paper
Engineering, Electrical & Electronic
I. Bineva, T. Hristova-Vassileva, B. Pejova, D. Nesheva, Z. Levi, Z. Aneva
2015 INTERNATIONAL SEMICONDUCTOR CONFERENCE (CAS)
(2015)