1
|
Bužančić Milosavljević M, Bonačić-Koutecký V. Design of J-aggregates-like oligomers built from squaraine dyes exhibiting transparency in the visible regime and high fluorescence quantum yield in the NIR region. Phys Chem Chem Phys 2024; 26:1314-1321. [PMID: 38108190 DOI: 10.1039/d3cp05291e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2023]
Abstract
New materials for transparent luminescent solar concentrators (TLSCs) are of large interest. Therefore, we investigated the optical properties of J-aggregates-like oligomers (hereinafter referred to as J-aggregates) based on covalently bound squaraine dyes in toluene solvent using DFT and TD-DFT methods. In addition, the rate constants needed for the prediction of fluorescence quantum yield (QY) have been calculated using Fermi's Golden rule and vertical harmonic approximation (VH) for ground and excited states. In the context of QY prediction, different broadening of the lineshape has also been employed. We found that J-aggregates based on squaraine dyes exhibit near-infrared (NIR) selective absorption and emission as well as high fluorescence QY. Comparison of the properties obtained for dimers, trimers and tetramers belonging to two classes (SQA and SQB) of J-aggregates allows us to select the tetramer of SQA J-aggregates as suitable for application. The scaling model for N ≥ 4 monomer subunits supports quantitative findings. Therefore, we propose J-aggregates containing N ≥ 4 subunits of SQA with a central squaric acid ring with two oxygen atoms in toluene solvent as a suitable candidate for TLSC application.
Collapse
Affiliation(s)
- Margarita Bužančić Milosavljević
- Center of Excellence for Science and Technology-Integration of Mediterranean region (STIM), Faculty of Science, University of Split, Ruđera Boškovića 33, 21000 Split, Croatia.
| | - Vlasta Bonačić-Koutecký
- Center of Excellence for Science and Technology-Integration of Mediterranean region (STIM), Faculty of Science, University of Split, Ruđera Boškovića 33, 21000 Split, Croatia.
- Interdisciplinary Center for Advanced Science and Technology (ICAST) at University of Split, Meštrovićevo šetalište 45, 21000 Split, Croatia
- Department of Chemistry, Humboldt Universität zu Berlin, Brook-Taylor-Strasse 2, 12489 Berlin, Germany.
| |
Collapse
|
2
|
Hu H, Wu Y, Gong X. Organosilicon-Based Carbon Dots and Their Versatile Applications. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2024; 20:e2305933. [PMID: 37661362 DOI: 10.1002/smll.202305933] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/14/2023] [Revised: 08/09/2023] [Indexed: 09/05/2023]
Abstract
Carbon dots (CDs) are a newly discovered type of fluorescent material that has gained significant attention due to their exceptional optical properties, biocompatibility, and other remarkable characteristics. However, single CDs have some drawbacks such as self-quenching, low quantum yield (QY), and poor stability. To address these issues, researchers have turned to organosilicon, which is known for its green, economical, and abundant properties. Organosilicon is widely used in various fields including optics, electronics, and biology. By utilizing organosilicon as a synthetic precursor, the biocompatibility, QY, and resistance to self-quenching of CDs can be improved. Meanwhile, the combination of organosilicon with CDs enables the functionalization of CDs, which significantly expands their original application scenarios. This paper comprehensively analyzes organosilicon in two main categories: precursors for CD synthesis and matrix materials for compounding with CDs. The role of organosilicon in these categories is thoroughly reviewed. In addition, the paper presents various applications of organosilicon compounded CDs, including detection and sensing, anti-counterfeiting, optoelectronic applications, and biological applications. Finally, the paper briefly discusses current development challenges and future directions in the field.
Collapse
Affiliation(s)
- Huajiang Hu
- State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan, 430070, P. R. China
| | - Yongzhong Wu
- School of Mechanical Engineering, Suzhou University of Science and Technology, Suzhou, 215009, P. R. China
| | - Xiao Gong
- State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan, 430070, P. R. China
| |
Collapse
|
3
|
Gao X, Yu H, Han Z, Chen B, Sun J, Li X. Bright solid-state luminescence and high-temperature resistance of Ga-doped carbon dots with ultra-wideband white emission for light-emitting diodes. Dalton Trans 2023; 52:16388-16397. [PMID: 37870179 DOI: 10.1039/d3dt03082b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2023]
Abstract
Fluorescent CDs tend to undergo solid-state aggregation quenching in powder form. This is caused by the stacking of π-π conjugate structures and excessive resonant energy transfer. Moreover, various forms of N play an important role in white CDs suitable for LED applications. White, single-component, non-N-doped CDs have never been reported for LED application. In this study, to overcome this limitation, we developed Ga-doped CD powders containing no N element that exhibit ultra-wideband white emission in the range of 420-800 nm for LED applications and were able to resist solid-state aggregation quenching. Furthermore, the Ga-doped CD powders demonstrated excellent luminescence stability under high temperatures. Another strength of the Ga-doped CD powders is their large Stokes shift, where the peak center of white emission shifts from 550 nm to 650 nm under 365 nm excitation as the Ga doping concentration is adjusted from 0.05 to 0.6 (Ga : H2O, mass ratio). The full width at half-maximum can reach 262 nm. Additionally, the Ga-doped CD powders exhibit good luminescence stability under long-time exposure to an air atmosphere. Their luminescent intensity retained 70%-74% of the initial values even after being left in natural placement for 100 days. Moreover, the Ga-doped CDs demonstrate afterglow features.
Collapse
Affiliation(s)
- Xiao Gao
- Department of Physics, Dalian Maritime University, No. 1, Linghai Road, Dalian 116026, Liaoning, China.
| | - Hongquan Yu
- Department of Physics, Dalian Maritime University, No. 1, Linghai Road, Dalian 116026, Liaoning, China.
| | - Zhanwen Han
- Department of Physics, Dalian Maritime University, No. 1, Linghai Road, Dalian 116026, Liaoning, China.
| | - Baojiu Chen
- Department of Physics, Dalian Maritime University, No. 1, Linghai Road, Dalian 116026, Liaoning, China.
| | - Jiashi Sun
- Department of Physics, Dalian Maritime University, No. 1, Linghai Road, Dalian 116026, Liaoning, China.
| | - Xiangping Li
- Department of Physics, Dalian Maritime University, No. 1, Linghai Road, Dalian 116026, Liaoning, China.
| |
Collapse
|
4
|
Huang C, Duan M, Shi Y, Liu H, Zhang P, Zuo Y, Yan L, Xu Y, Niu Y. Insights into the antibacterial mechanism of iron doped carbon dots. J Colloid Interface Sci 2023; 645:933-942. [PMID: 37178569 DOI: 10.1016/j.jcis.2023.04.149] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2023] [Revised: 04/21/2023] [Accepted: 04/27/2023] [Indexed: 05/15/2023]
Abstract
Antibacterial nanomaterials provide promising alternative strategies to combat the bacterial infection due to deteriorating resistance. However, few have been practically applied due to the lack of clear antibacterial mechanisms. In this work, we selected good-biocompatibility iron-doped CDs (Fe-CDs) with antibacterial activity as a comprehensive research model to systematically reveal the intrinsic antibacterial mechanism. Through energy dispersive spectroscopy (EDS) mapping of in situ ultrathin sections of bacteria, we found that a large amount of iron was accumulated inside the bacteria treated with Fe-CDs. Then, combining the data of cell level and transcriptomics, it can be elucidated that Fe-CDs could interact with cell membranes, enter bacterial cells through iron transport and infiltration, increase intracellular iron levels, trigger increased reactive oxygen species (ROS), and lead to disruption of Glutathione (GSH)-dependent antioxidant mechanisms. Excessive ROS further leads to lipid peroxidation and DNA damage in cells, lipid peroxidation destroys the integrity of the cell membrane, and finally leads to the leakage of intracellular substances resulting in bacterial growth inhibition and death. This result provides important insights into the antibacterial mechanism of Fe-CDs and further provides a basis for the deep application of nanomaterials in biomedicine.
Collapse
Affiliation(s)
- Chao Huang
- Institute of Biomedical Engineering, College of Life Science, Qingdao University, Qingdao 266071, PR China
| | - Meilin Duan
- Institute of Biomedical Engineering, College of Life Science, Qingdao University, Qingdao 266071, PR China
| | - Yanfeng Shi
- Institute of Biomedical Engineering, College of Life Science, Qingdao University, Qingdao 266071, PR China
| | - Hao Liu
- Institute of Biomedical Engineering, College of Life Science, Qingdao University, Qingdao 266071, PR China
| | - Pengfei Zhang
- Department of Urology Key Laboratory of Urinary System Diseases, The Affiliated Hospital of Qingdao University, Qingdao 266003, PR China
| | - Yuhui Zuo
- Institute of Biomedical Engineering, College of Life Science, Qingdao University, Qingdao 266071, PR China
| | - Lei Yan
- Institute of Biomedical Engineering, College of Life Science, Qingdao University, Qingdao 266071, PR China
| | - Yuanhong Xu
- Institute of Biomedical Engineering, College of Life Science, Qingdao University, Qingdao 266071, PR China.
| | - Yusheng Niu
- Institute of Biomedical Engineering, College of Life Science, Qingdao University, Qingdao 266071, PR China.
| |
Collapse
|