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Journal articles on the topic 'Ternary quantum dots'

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Published: 8 June 2024

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1

Muñoz, Raybel, Eva M. Santos, Carlos A. Galan-Vidal, Jose M. Miranda, Aroa Lopez-Santamarina, and Jose A. Rodriguez. "Ternary Quantum Dots in Chemical Analysis. Synthesis and Detection Mechanisms." Molecules 26, no. 9 (May 8, 2021): 2764. http://dx.doi.org/10.3390/molecules26092764.

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Ternary quantum dots (QDs) are novel nanomaterials that can be used in chemical analysis due their unique physicochemical and spectroscopic properties. These properties are size-dependent and can be adjusted in the synthetic protocol modifying the reaction medium, time, source of heat, and the ligand used for stabilization. In the last decade, several spectroscopic methods have been developed for the analysis of organic and inorganic analytes in biological, drug, environmental, and food samples, in which different sensing schemes have been applied using ternary quantum dots. This review addresses the different synthetic approaches of ternary quantum dots, the sensing mechanisms involved in the analyte detection, and the predominant areas in which these nanomaterials are used.

2

Glassy, Benjamin A., and Brandi M. Cossairt. "Ternary synthesis of colloidal Zn3P2quantum dots." Chemical Communications 51, no. 25 (2015): 5283–86. http://dx.doi.org/10.1039/c4cc08068h.

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3

Aladesuyi, Olanrewaju A., Thabang C. Lebepe, Rodney Maluleke, and Oluwatobi S. Oluwafemi. "Biological applications of ternary quantum dots: A review." Nanotechnology Reviews 11, no. 1 (January 1, 2022): 2304–19. http://dx.doi.org/10.1515/ntrev-2022-0136.

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Abstract Semiconductor nanomaterials, also known as quantum dots (QDs), have gained significant interest due to their outstanding optical properties with potential biological and biomedical applications. However, the presence of heavy toxic metals such as Cd, Pb, and Hg in conventional QDs have been a major challenge in their applications. Therefore, it is imperative to seek a viable alternative that will be non-toxic and have similar optical properties as the conventional QDs. Ternary I–III–VI QDs have been found to be suitable alternatives. Their optical properties are tunable and have emissions in the near-infrared region. These properties make them useful in a wide range of biological applications. Hence, this review focuses on the recent progress in the use of ternary QDs in Forster resonance energy transfer (FRET), nanomedical applications such as drug and gene delivery. It also discusses the biophotonic application of ternary I–III–VI QDs in optical imaging, biosensing, and multimodal imaging. Furthermore, we looked at the pharmacokinetics and biodistribution of these QDs, and their toxicity concerns. Finally, we looked at the current status, challenges, and future directions in the application of these ternary QDs.

4

Hai, Nguyen Ngọc, Nguyen Hai Yen, Duong Thi Giang, Dinh Hung Cuong, Nguyen Duc Nhat, Pham Thu Nga, and Dao Tran Cao. "Mechanism to Detect Pesticide Residues in Tealeaves Based on CdZnSe/ZnS Ternary Alloy Quantum Dots." Communications in Physics 25, no. 1 (May 15, 2015): 67. http://dx.doi.org/10.15625/0868-3166/25/1/5601.

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In this report, we present the optical properties of the biosensors fabricated from CdZnSe/ZnS quantum dots. The optical properties such as absorption and emission of the ternary quantum dots before and after coupling with the protein molecules like streptavidine (SA) and acetylcholinesterase enzymes (AChE), to form a biosensor structure, will be presented. In particular, the changes in luminescence intensity according to the pH value of the solution environment containing biosensor have been considered, before and after the presence of pesticides. The changes in luminescence intensity of the biosensor after the presence of pesticide over time from 2 seconds to 26 minutes were also surveyed. We have been carried out the tests to determine the trace amounts of commercial pesticides like Motox 5EC, containing 5% cypermethrin and Tungatin 10 EC, containing 10% abamectin, on the real samples of tealeaves. Some characteristics of the relationship between composition, structure, and special optical properties of ternary alloy quantum dots will also be presented. These studies open up the potential applications of ternary quantum dots for agricultural production.

5

Jiang, Tianhao, Chaoqun Shang, Qingguo Meng, Mingliang Jin, Hua Liao, Ming Li, Zhihong Chen, Mingzhe Yuan, Xin Wang, and Guofu Zhou. "The Ternary Heterostructures of BiOBr/Ultrathin g-C3N4/Black Phosphorous Quantum Dot Composites for Photodegradation of Tetracycline." Polymers 10, no. 10 (October 9, 2018): 1118. http://dx.doi.org/10.3390/polym10101118.

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Herein, we synthesized BiOBr/ultrathin g-C3N4/ternary heterostructures modified with black phosphorous quantum dots using a simple water bath heating and sonication method. The ternary heterostructure was then used for the photocatalytic degradation of tetracycline in visible light, with an efficiency as high as 92% after 3 h of irradiation. Thus, the photodegradation efficiency is greatly improved compared to that of ultrathin g-C3N4, BiOBr, and black phosphorous quantum dots alone. The synthesized ternary heterostructure improves the charge separation efficiency, thus increasing the photodegradation efficiency. This work provides a new and efficient method for the degradation of antibiotics in the environment.

6

Sun, Jianhui, Michio Ikezawa, Xiuying Wang, Pengtao Jing, Haibo Li, Jialong Zhao, and Yasuaki Masumoto. "Photocarrier recombination dynamics in ternary chalcogenide CuInS2 quantum dots." Physical Chemistry Chemical Physics 17, no. 18 (2015): 11981–89. http://dx.doi.org/10.1039/c5cp00034c.

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Photocarrier recombination dynamics in ternary chalcogenide CuInS₂ quantum dots (CIS QDs) was studied by means of femtosecond transient-absorption (TA) and nanosecond time-resolved photoluminescence (PL) spectroscopy.

7

Han, Xu, Sumeet C. Pandey, and Dimitrios Maroudas. "Kinetics of interdiffusion in semiconductor ternary quantum dots." Applied Physics Letters 101, no. 14 (October 2012): 141906. http://dx.doi.org/10.1063/1.4757148.

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8

Gelchuk, Y., O. Boreiko, G. Okrepka, and Yu Khalavka. "Synthesis and optical properties of AgInS2 nanoparticles." Chernivtsi University Scientific Herald. Chemistry, no. 818 (2019): 12–19. http://dx.doi.org/10.31861/chem-2019-818-02.

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Ternary chalcogenide Ag-In quantum dots (QDs) are more environmentally friendly than known Cd-, Pb- and P-containing nanoparticles. Here we review the literature on colloidal synthesis methods, properties, and promising fields for the application of AgInS2 quantum dots. Similar to the QDs of lead and cadmium chalcogenides, the most accurate control over the structure and morphology of AgInS2 QDs is achieved by using the method of introducing precursors into high-boiling organic solvents. However, to realize the potential applications of ternary quantum dots, in particular as luminescent biomarkers, the quantum dots must be soluble in polar solvents, especially water. The transfer of quantum dots into aqueous solutions is usually accomplished by exchanging primary lyophilic ligands with smaller bifunctional molecules, such as thioglycolic (or mercaptopropionic) acids, which can passivate the surface of the quantum dots while making them soluble in the polar environment. Methods of colloidal synthesis of AgInS2 / ZnS quantum dots can be classified into the following types: Injection of ions into a high-boiling solvent Synthesis in a mixture of solvents Synthesis in the aquatic environment Methods for the synthesis of AgInS2 QDs in both aqueous solution and organic solvent medium are described. Examples of application of quantum dots for biomedical purposes and in photovoltaic and sensory devices are given. Quantum dots have high photostability and brightness, are characterized by a wide range of absorption and narrow spectral bands of radiation, ie meet most of the criteria for fluorescent materials and biosensors for imaging cancer cells in antitumor therapy, immunofluorescent labeling of proteins, detection of toxins s, visualize intracellular structures, etc. Quantum dots of tertiary chalcogenides, in particular CuInS2 and AgInS2, may be an alternative to quantum dots of binary lead and cadmium chalcogenides for use in light-emitting and light-absorbing systems, such as LEDs, sensors and solar absorbers.

9

Kurshanov, D. A., I. A. Arefina, M. S. Stepanova, A. Dubavik, and A. V. Baranov. "Effect of Fe-=SUB=-3-=/SUB=-O-=SUB=-4-=/SUB=- nanoparticle concentration on the luminescence of AgInS-=SUB=-2-=/SUB=-/ZnS in hybrid complex CaCO-=SUB=-3-=/SUB=--Fe-=SUB=-3-=/SUB=-O-=SUB=-4-=/SUB=-@AgInS-=SUB=-2-=/SUB=-/ZnS-=SUP=-*-=/SUP=-." Оптика и спектроскопия 129, no. 11 (2021): 1424. http://dx.doi.org/10.21883/os.2021.11.51649.1418-21.

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In this paper, we studied the properties of a multifunctional system, in which the luminescent and magnetic properties are combined. The calcium carbonate microspheres are used as porous matrices for complexes combining luminescence properties of AgInS2/ZnS quantum dots and magnetic properties of Fe3O4 nanoparticles. The study investigates the effect of magnetic nanoparticles concentration on optical properties of quantum dots in CaCO3-Fe3O4@AgInS2/ZnS complexes. It is shown that applying calcium carbonate microspheres as a matrix permits to reduce quenching of the quantum dots luminescence. Keywords: hybrid system; ternary quantum dots; magnetic nanoparticles; iron oxide; calcium carbonate microspheres.

10

Kurshanov D.A., Arefina I. A., Stepanova M. S., Dubavik A., and Baranov A. V. "Effect of Fe-=SUB=-3-=/SUB=-O-=SUB=-4-=/SUB=- nanoparticle concentration on the luminescence of AgInS-=SUB=-2-=/SUB=-/ZnS in hybrid complex CaCO-=SUB=-3-=/SUB=--Fe-=SUB=-3-=/SUB=-O-=SUB=-4-=/SUB=-@AgInS-=SUB=-2-=/SUB=-/ZnS." Optics and Spectroscopy 130, no. 14 (2022): 2134. http://dx.doi.org/10.21883/eos.2022.14.53999.1418-21.

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In this paper, we studied the properties of a multifunctional system, in which the luminescent and magnetic properties are combined. The calcium carbonate microspheres are used as porous matrices for complexes combining luminescence properties of AgInS2/ZnS quantum dots and magnetic properties of Fe3O4 nanoparticles. The study investigates the effect of magnetic nanoparticles concentration on optical properties of quantum dots in CaCO3-Fe3O4@AgInS2/ZnS complexes. It is shown that applying calcium carbonate microspheres as a matrix permits to reduce quenching of the quantum dots luminescence. Keywords: hybrid system; ternary quantum dots, magnetic nanoparticles, iron oxide; calcium carbonate microspheres.

11

Aldakov, Dmitry, Muhammad T. Sajjad, Valentina Ivanova, Ashu K. Bansal, Jinhyung Park, Peter Reiss, and Ifor D. W. Samuel. "Mercaptophosphonic acids as efficient linkers in quantum dot sensitized solar cells." Journal of Materials Chemistry A 3, no. 37 (2015): 19050–60. http://dx.doi.org/10.1039/c5ta04021c.

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12

May, Bambesiwe M., Mokae F. Bambo, Seyed Saeid Hosseini, Unathi Sidwaba, Edward N. Nxumalo, and Ajay K. Mishra. "A review on I–III–VI ternary quantum dots for fluorescence detection of heavy metals ions in water: optical properties, synthesis and application." RSC Advances 12, no. 18 (2022): 11216–32. http://dx.doi.org/10.1039/d1ra08660j.

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13

Hung, Le Xuan, Pascal D. Bassène, Pham Nam Thang, Nguyễn Thu Loan, Willy Daney de Marcillac, Amit Raj Dhawan, Fu Feng, et al. "Near-infrared emitting CdTeSe alloyed quantum dots: Raman scattering, photoluminescence and single-emitter optical properties." RSC Adv. 7, no. 76 (2017): 47966–74. http://dx.doi.org/10.1039/c7ra06500k.

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14

Chen, Guifeng, Qinghua Du, Hui Zhang, Ruotong Niu, Wenhao Yuan, Xinjian Xie, Tianyu Guo, and Guodong Liu. "Cu-related defects and optical properties in copper–indium–selenide quantum dots by a green synthesis." Journal of Applied Physics 131, no. 14 (April 14, 2022): 145704. http://dx.doi.org/10.1063/5.0085492.

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Quantum dots of I–III–VI ternary compounds exhibit unusual photophysical properties and technological utility, which attract attention and have been intensely investigated. CuInSe2 quantum dots are an environmentally friendly composition, a direct transition, and an adjustable bandgap. Here, we discuss the influence of the Cu/In molar ratio of CuInSe2 quantum dots on Cu-related defects and photo-physical properties, and CuInSe2 quantum dots are synthesized by a green, safe, and low-temperature method in triethylene glycol. The proportion of the +1 and +2 oxidation states of Cu in the quantum dots will change with the Cu/In molar atomic ratio. The +1-oxidation state of Cu will prolong the carrier recombination lifetime and provide favorable conditions for the transfer and collection of carriers. By adjusting for different defect types, we can better apply CISe quantum dots in devices and other fields.

15

Chiristina, Eva Natalia, Siti Utari Rahayu, Auttasit Tubtimtae, Jen-Bin Shi, and Ming-Way Lee. "Rare-earth-incorporated ternary Ce_xCd_1−xS quantum dot-sensitized solar cells." RSC Advances 12, no. 48 (2022): 31093–101. http://dx.doi.org/10.1039/d2ra05905c.

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16

Pandey, Sumeet C., Georgios I. Sfyris, and Dimitrios Maroudas. "Theory of surface segregation in ternary semiconductor quantum dots." Applied Physics Letters 98, no. 9 (February 28, 2011): 091907. http://dx.doi.org/10.1063/1.3559939.

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17

Allen, C. Nì, P. Finnie, S. Raymond, Z. R. Wasilewski, and S. Fafard. "Inhomogeneous broadening in quantum dots with ternary aluminum alloys." Applied Physics Letters 79, no. 17 (October 22, 2001): 2701–3. http://dx.doi.org/10.1063/1.1410333.

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18

Litvin, Aleksandr P., Ivan D. Skurlov, Iurii G. Korzhenevskii, Aliaksei Dubavik, Sergei A. Cherevkov, Anastasiia V. Sokolova, Peter S. Parfenov, et al. "Ternary Composites with PbS Quantum Dots for Hybrid Photovoltaics." Journal of Physical Chemistry C 123, no. 5 (January 18, 2019): 3115–21. http://dx.doi.org/10.1021/acs.jpcc.8b11685.

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19

Tyagi, Jagriti, Himanshu Gupta, and L. P. Purohit. "Ternary alloyed CdS1−xSex quantum dots on TiO2/ZnS electrodes for quantum dots-sensitized solar cells." Journal of Alloys and Compounds 880 (November 2021): 160480. http://dx.doi.org/10.1016/j.jallcom.2021.160480.

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20

Nguyen, Hai Yen, Willy Daney de Marcillac, Clotilde Lethiec, Ngoc Hong Phan, Catherine Schwob, Agnès Maître, Quang Liem Nguyen, et al. "Synthesis and optical properties of core/shell ternary/ternary CdZnSe/ZnSeS quantum dots." Optical Materials 36, no. 9 (July 2014): 1534–41. http://dx.doi.org/10.1016/j.optmat.2014.04.020.

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21

Lemke, Karina, and Joachim Koetz. "Polycation-Capped CdS Quantum Dots Synthesized in Reverse Microemulsions." Journal of Nanomaterials 2012 (2012): 1–10. http://dx.doi.org/10.1155/2012/478153.

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This paper is focused on the formation and recovery of cadmium sulfide (CdS) nanoparticles in two different types of polycation-modified reverse microemulsions using low molecular weight poly(diallyldimethylammonium chloride) (PDADMAC) and poly(ethyleneimine) (PEI). Both polymers were incorporated in a quaternary w/o microemulsion consisting of water, toluene-pentanol (1 : 1), and sodium dodecyl sulfate (SDS), as well as in a ternary w/o microemulsion consisting of water, heptanol, and 3-(N,N-dimethyl-dodecylammonio)-propanesulfonate (SB). UV-vis and fluorescence measurements in the microemulsion illustrate the capping effect of the polycations on the formation of the CdS quantum dots. The nanoparticles are redispersed in water and characterized by using UV-vis and fluorescence spectroscopy, in combination with dynamic light scattering. From the quaternary microemulsion, only nanoparticle aggregates of about 100 nm can be redispersed, but, from the ternary microemulsion, well-stabilized polycation-capped CdS quantum dots can be obtained. The results show that the electrostatic interactions between the polycation and the surfactant are of high relevance especially in the solvent evaporation and redispersion process. That means only that in the case of moderate polycation-surfactant interactions a redispersion of the polymer-capped CdS quantum dots without problems of aggregation is possible.

22

Ebrahim, Fadia, Omar Al-Hartomy, and S. Wageh. "Cadmium-Based Quantum Dots Alloyed Structures: Synthesis, Properties, and Applications." Materials 16, no. 17 (August 28, 2023): 5877. http://dx.doi.org/10.3390/ma16175877.

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Cadmium-based alloyed quantum dots are one of the most popular metal chalcogenides in both the industrial and research fields owing to their extraordinary optical and electronic properties that can be manipulated by varying the compositional ratio in addition to size control. This report aims to cover the main information concerning the synthesis techniques, properties, and applications of Cd-based alloyed quantum dots. It provides a comprehensive overview of the most common synthesis methods for these QDs, which include hot injection, co-precipitation, successive ionic layer adsorption and reaction, hydrothermal, and microwave-assisted synthesis methods. This detailed literature highlights the optical and structural properties of both ternary and quaternary quantum dots. Also, this review provides the high-potential applications of various alloyed quantum dots.

23

Vacha, Martin, and Dharmendar Kumar Sharma. "Photophysics and electroluminescence of single nanocrystals of halide perovskites and related nanomaterials." EPJ Web of Conferences 190 (2018): 02012. http://dx.doi.org/10.1051/epjconf/201819002012.

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We report simultaneous photoluminescence and electroluminescence single-particle study of nanocrystals of inorganic halide perovskite CsPbBr3, as well as of ternary I-III-IV semiconductor quantum dots.

24

Fan, Fei, Bin Zhang, Yaming Cao, Xutong Yang, Junwei Gu, and Yu Chen. "Conjugated polymer covalently modified graphene oxide quantum dots for ternary electronic memory devices." Nanoscale 9, no. 30 (2017): 10610–18. http://dx.doi.org/10.1039/c7nr02809a.

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A novel arylamine-based polyazomethine covalently functionalized graphene oxide quantum dots (TPAPAM-GOQDs), which exhibited nonvolatile ternary memory effect with an OFF : ON-1 : ON-2 current ratio of 1 : 60 : 3000, was synthesized.

25

Mubeen, Muhammad, Noor ul Ain, Muhammad Adnan Khalid, Maria Mukhtar, Bushra Naz, Zumaira Siddique, Anwar Ul-Hamid, and Azhar Iqbal. "Enhancing the FRET by tuning the bandgap of acceptor ternary ZnCdS quantum dots." RSC Advances 13, no. 28 (2023): 19096–105. http://dx.doi.org/10.1039/d3ra03233g.

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In this article, we report the band gap tuning of ternary ZnCdS quantum dots (QDs) by varying the concentration of the capping ligand, mercaptoacetic acid (MAA) that enhances the FRET in artificial sunscreen/QDs dyad.

26

Yu, Yunjian, Lin Mei, Yanmei Shi, Xinge Zhang, Kesong Cheng, Fengyi Cao, Liuxue Zhang, Jia Xu, Xiumin Li, and Zhenlong Xu. "Ag-Conjugated graphene quantum dots with blue light-enhanced singlet oxygen generation for ternary-mode highly-efficient antimicrobial therapy." Journal of Materials Chemistry B 8, no. 7 (2020): 1371–82. http://dx.doi.org/10.1039/c9tb02300c.

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A broad-spectrum antibacterial system was produced in which silver nanoparticle-conjugated graphene quantum dots were utilised as a blue light-enhanced nanotherapeutic for efficient ternary-mode antimicrobial therapy.

27

Brown, S. S., A. J. Rondinone, M. D. Pawel, and S. Dai. "Ternary cadmium sulphide selenide quantum dots as new scintillation materials." Materials Technology 23, no. 2 (June 2008): 94–99. http://dx.doi.org/10.1179/175355508x310124.

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Pečar, P., A. Ramšak, N. Zimic, M. Mraz, and I. Lebar Bajec. "Adiabatic pipelining: a key to ternary computing with quantum dots." Nanotechnology 19, no. 49 (November 18, 2008): 495401. http://dx.doi.org/10.1088/0957-4484/19/49/495401.

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Maroudas, Dimitrios, Xu Han, and Sumeet C. Pandey. "Design of semiconductor ternary quantum dots with optimal optoelectronic function." AIChE Journal 59, no. 9 (May 21, 2013): 3223–36. http://dx.doi.org/10.1002/aic.14118.

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30

Choi, Hyekyoung, Sungwoo Kim, Joseph M. Luther, Sang-Wook Kim, Dongwoon Shin, Matthew C. Beard, and Sohee Jeong. "Facet-Specific Ligand Interactions on Ternary AgSbS2 Colloidal Quantum Dots." Chemistry - A European Journal 23, no. 70 (November 7, 2017): 17707–13. http://dx.doi.org/10.1002/chem.201703681.

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Choi, Hyekyoung, Sungwoo Kim, Joseph M. Luther, Sang-Wook Kim, Dongwoon Shin, Matthew C. Beard, and Sohee Jeong. "Facet-Specific Ligand Interactions on Ternary AgSbS2 Colloidal Quantum Dots." Chemistry - A European Journal 23, no. 70 (November 8, 2017): 17625. http://dx.doi.org/10.1002/chem.201704971.

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32

Qi, Kezhen, Yu Wang, Ruidan Wang, Di Wu, and Guo-Dong Li. "Facile synthesis of homogeneous CuInS2 quantum dots with tunable near-infrared emission." Journal of Materials Chemistry C 4, no. 9 (2016): 1895–99. http://dx.doi.org/10.1039/c5tc04232a.

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Ternary CuInS₂ quantum dots (QDs) with homogeneous and tunable emission ranging from 693 to 835 nm were synthesized via a one-pot thermolysis route. The fluorescence of CuInS₂ QDs was greatly enhanced via surface passivation of ZnS layers.

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Wang, Jun, Yan Li, Juan Ge, Bo-Ping Zhang, and Wan Wan. "Improving photocatalytic performance of ZnO via synergistic effects of Ag nanoparticles and graphene quantum dots." Physical Chemistry Chemical Physics 17, no. 28 (2015): 18645–52. http://dx.doi.org/10.1039/c5cp02352a.

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A Ag–graphene quantum dots (GQDs)–ZnO ternary photocatalyst was prepared using GQDs as both a reducing agent and a cation solvent. Photodegradation performance was improved because of the synergic effect of Ag and GQDs.

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Jiang, Zicong, Yun Lei, Mingzhen Zhang, Zheng Zhang, and Zhong Ouyang. "Graphene Quantum Dots-Modified Ternary ZnCdS Semiconductor for Enhancing Photoelectric Properties." Journal of Nanomaterials 2019 (June 9, 2019): 1–9. http://dx.doi.org/10.1155/2019/6042026.

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A series of graphene quantum dots-modified ZnCdS (ZnCdS/G) composites with different contents of graphene quantum dots (GQDs) were prepared by a solvothermal route and characterized via various measurements. GQDs have a type graphene height of 2 nm and exhibit an excitation-dependent PL behavior. GQDs-modified ZnCdS composites present good lattice fingers that can be assigned to the (110) plane of GQDs and (112) plane of ZnCdS. The effect of different GQDs contents on the photoelectric property of ZnCdS was investigated. The results show that the photocurrent density of ZnCdS/G first increases and achieves a maximum of 11.4 μA/cm2 with the addition of 0.06 wt% and then decreases as the GQDs content changes from 0.06 wt% to 0.12 wt%. Photocurrent counts as a function of time present a decrease of 10% and remains stable after 1600 s.

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Gugula, K., A. Szydlo, L. Stegemann, C. A. Strassert, and M. Bredol. "Photobleaching-resistant ternary quantum dots embedded in a polymer-coated silica matrix." Journal of Materials Chemistry C 4, no. 23 (2016): 5263–69. http://dx.doi.org/10.1039/c6tc00943c.

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36

Shokry, Azza, Ayman El Tahan, Hesham Ibrahim, Moataz Soliman, and Shaker Ebrahim. "The development of a ternary nanocomposite for the removal of Cr(vi) ions from aqueous solutions." RSC Advances 9, no. 67 (2019): 39187–200. http://dx.doi.org/10.1039/c9ra08298k.

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The aim is to develop a ternary nanocomposite of polyaniline/2-acrylamido-2-methylpropanesulfonic acid-capped silver nanoparticles/graphene oxide quantum dots as an efficient adsorbent for the removal of the highly toxic hexavalent chromium (Cr(vi)) from polluted water.

37

Sulaman, Muhammad, Shengyi Yang, Taojian Song, Haowei Wang, Yishan Wang, Bo He, Miao Dong, Yi Tang, Yong Song, and Bingsuo Zou. "High performance solution-processed infrared photodiode based on ternary PbSxSe1−x colloidal quantum dots." RSC Advances 6, no. 90 (2016): 87730–37. http://dx.doi.org/10.1039/c6ra19946a.

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High performance solution-processed infrared photodiodes ITO/ZnO/PbS_xSe_1−x/Au, in which ternary PbS_xSe_1−x colloidal quantum dots acts as the active layer and ZnO interlayer acts as electron-transporting layer, have been demonstrated.

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Swelm, Wageh, Ahmed Al-Ghamdi, Asim Jilani, and Javed Iqbal. "Facile Synthesis of Ternary Alloy of CdSe1-xSx Quantum Dots with Tunable Absorption and Emission of Visible Light." Nanomaterials 8, no. 12 (November 27, 2018): 979. http://dx.doi.org/10.3390/nano8120979.

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The synthesis of alloyed semiconductor quantum dots has produced structures that have distinct properties in comparison with both their bulk counterparts and their parent binary semiconductor quantum dots. In this work, the quantum confined structures of a ternary alloy of CdSe1−xSx were synthesized by one-pot synthesis method in an aqueous medium at a low temperature and capped with 3-mercaptopropoionic acid. Structures of the synthesized quantum dots were investigated by energy dispersive X-ray, X-ray diffraction, X-ray photoelectron spectroscopy, and high-resolution transmission electron microscopy. The obtained quantum dots had modified cubic structures as proven by X-ray diffraction and selected area electron diffraction. The optical properties of the synthesized quantum dots were characterized by optical absorption, photoluminescence, and color analysis. Optical absorption investigation revealed a widening of the band gap of CdSe1−xSx with increasing S content. This widening increased for the samples suspended in water relative to the samples measured in powder form due to the difference in the environment of the two cases. The size determined from the optical absorption measurements was found to be compatible with the sizes obtained from the X-ray diffraction with the value of bowing parameter around 1, which indicated a graded diffusion of sulfur. It was also ascertained that the emission of different compositions covered the most visible range with a small full width at half maximum. The x and y values of the chromaticity coordinates decreased with increasing sulfur content of up to 15%, while the z value increased.

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Nga, Pham Thu, Nguyen Hai Yen, Dinh Hung Cuong, Nguyen Ngoc Hai, Nguyen Xuan Nghia, Vu Thi Hong Hanh, Le Van Vu, and Laurent Coolen. "Study on the fabrication of CdZnSe/ZnSeS ternary alloy quantum dots." International Journal of Nanotechnology 12, no. 5/6/7 (2015): 525. http://dx.doi.org/10.1504/ijnt.2015.067910.

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Aladesuyi, Olanrewaju A., and Oluwatobi S. Oluwafemi. "Synthesis strategies and application of ternary quantum dots — in cancer therapy." Nano-Structures & Nano-Objects 24 (October 2020): 100568. http://dx.doi.org/10.1016/j.nanoso.2020.100568.

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Wang, Chunlei, Shuhong Xu, Yujie Shao, Zhuyuan Wang, Qinying Xu, and Yiping Cui. "Synthesis of Ag doped ZnlnSe ternary quantum dots with tunable emission." J. Mater. Chem. C 2, no. 26 (2014): 5111–15. http://dx.doi.org/10.1039/c4tc00601a.

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Hochreiner, A., S. Kriechbaumer, T. Schwarzl, H. Groiss, M. Hassan, and G. Springholz. "Tuning of mid-infrared emission of ternary PbSrTe/CdTe quantum dots." Applied Physics Letters 100, no. 11 (March 12, 2012): 113112. http://dx.doi.org/10.1063/1.3694286.

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Yang, Min, Yongbo Wang, Yingkun Ren, Enzhou Liu, Jun Fan, and Xiaoyun Hu. "Zn/Cd ratio-dependent synthetic conditions in ternary ZnCdS quantum dots." Journal of Alloys and Compounds 752 (July 2018): 260–66. http://dx.doi.org/10.1016/j.jallcom.2018.04.084.

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Mićić, O. I., and A. J. Nozik. "Synthesis and characterization of binary and ternary III–V quantum dots." Journal of Luminescence 70, no. 1-6 (October 1996): 95–107. http://dx.doi.org/10.1016/0022-2313(96)00047-6.

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Vorontsov, Dmytro, Anna Fučíková, Václav Dědič, and Jan Valenta. "Cd-free photoluminescent composites based on the ternary chalcogenides quantum dots." Optical Materials 143 (September 2023): 114208. http://dx.doi.org/10.1016/j.optmat.2023.114208.

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Walther, Thomas. "Measurement of Diffusion and Segregation in Semiconductor Quantum Dots and Quantum Wells by Transmission Electron Microscopy: A Guide." Nanomaterials 9, no. 6 (June 8, 2019): 872. http://dx.doi.org/10.3390/nano9060872.

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Abstract:

Strategies are discussed to distinguish interdiffusion and segregation and to measure key parameters such as diffusivities and segregation lengths in semiconductor quantum dots and quantum wells by electron microscopy methods. Spectroscopic methods are usually necessary when the materials systems are complex while imaging methods may suffice for binary or simple ternary compounds where atomic intermixing is restricted to one type of sub-lattice. The emphasis on methodology should assist microscopists in evaluating and quantifying signals from electron micrographs and related spectroscopic data. Examples presented include CdS/ZnS core/shell particles and SiGe, InGaAs and InGaN quantum wells.

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Maluleke, Rodney, and Oluwatobi Samuel Oluwafemi. "Synthetic Approaches, Modification Strategies and the Application of Quantum Dots in the Sensing of Priority Pollutants." Applied Sciences 11, no. 24 (December 7, 2021): 11580. http://dx.doi.org/10.3390/app112411580.

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Abstract:

Polycyclic aromatic hydrocarbons (PAHs) and nitro-aromatic compounds (NACs) are two classifications of environmental pollutants that have become a source of health concerns. As a result, there have been several efforts towards the development of analytical methods that are efficient and affordable that can sense these pollutants. In recent decades, a wide range of techniques has been developed for the detection of pollutants present in the environment. Among these different techniques, the use of semiconductor nanomaterials, also known as quantum dots, has continued to gain more attention in sensing because of the optical properties that make them useful in the identification and differentiation of pollutants in water bodies. Reported studies have shown great improvement in the sensing of these pollutants. This review article starts with an introduction on two types of organic pollutants, namely polycyclic aromatic hydrocarbons and nitro-aromatic explosives. This is then followed by different quantum dots used in sensing applications. Then, a detailed discussion on different groups of quantum dots, such as carbon-based quantum dots, binary and ternary quantum dots and quantum dot composites, and their application in the sensing of organic pollutants is presented. Different studies on the comparison of water-soluble quantum dots and organic-soluble quantum dots of a fluorescence sensing mechanism are reviewed. Then, different approaches on the improvement of their sensitivity and selectivity in addition to challenges associated with some of these approaches are also discussed. The review is concluded by looking at different mechanisms in the sensing of polycyclic aromatic hydrocarbons and nitro-aromatic compounds.

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Kiran John, U., and Siby Mathew. "Investigation on nonlinear optical and optical limiting properties of Cd_0.7Zn_0.3Te quantum dots." Journal of Physics: Conference Series 2357, no. 1 (October 1, 2022): 012011. http://dx.doi.org/10.1088/1742-6596/2357/1/012011.

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Abstract:

Ternary alloyed Cd0.7Zn0.3Te colloidal quantum dots were synthesized under open atmosphere conditions. The Cd0.7Zn0.3Te quantum dots were characterized under XRD studies, DLS technique and optical absorption measurements. Using tauc and urbach relation the optical energy bandgap and urbach energy were obtained. The intensity depended nonlinear optical parameters of Cd0.7Zn0.3Te quantum dots were determined with Z-scan experimental setup using a green laser source working on continuous wave mode. The nonlinear absorption coefficient β, along with optical limiting capacity of Cd0.7Zn0.3Te quantum dot is investigated through the open aperture set up. The transmittance of Cd0.7Zn0.3Te quantum dot showed a sharp dip at the maximum intensity point of the laser which indicates reverse saturable absorption. The optical limiting threshold value for Cd0.7Zn0.3Te quantum dot was obtained around 4.6 KJ/cm2. The nonlinear refractive index of Cd0.7Zn0.3Te quantum dot is find out using closed aperture set up. The nonlinear refractive index with a negative sign was obtained for the Cd0.7Zn0.3Te quantum dot which is attributed to the self-defocusing phenomena. The nonlinear studies indicate that the sample exhibits good nonlinear properties and find applications in optical limiting materials.

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Miropoltsev, Maksim, Vera Kuznetsova, Anton Tkach, Sergei Cherevkov, Anastasiia Sokolova, Viktoria Osipova, Yulia Gromova, et al. "FRET-Based Analysis of AgInS2/ZnAgInS/ZnS Quantum Dot Recombination Dynamics." Nanomaterials 10, no. 12 (December 8, 2020): 2455. http://dx.doi.org/10.3390/nano10122455.

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Abstract:

Ternary quantum dots (QDs) are very promising nanomaterials with a range of potential applications in photovoltaics, light-emitting devices, and biomedicine. Despite quite intensive studies of ternary QDs over the last years, the specific relaxation channels involved in their emission mechanisms are still poorly understood, particularly in the corresponding core-shell nanostructures. In the present work, we have studied the recombination pathways of AgInS2 QDs stabilized with the ZnAgInS alloy layer and the ZnS shell (AIS/ZAIS/ZnS QDs) using time-resolved fluorescence spectroscopy. We have also investigated FRET in complexes of AIS/ZAIS/ZnS QDs and cyanine dyes with the absorption bands overlapping in the different regions of the QD emission spectrum, which allowed us to selectively quench the radiative transitions of the QDs. Our studies have demonstrated that FRET from QDs to dyes results in decreasing of all QD PL decay components with the shortest lifetime decreasing the most and the longest one decreasing the least. This research presents important approaches for the investigation of ternary QD luminescence mechanisms by the selective quenching of recombination pathways. These studies are also essential for potential applications of ternary QDs in photodynamic therapy, multiplex analysis, and time-resolved FRET sensing.

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Liu, Chang, Jingbo Wang, Shuang Yang, Xiuying Li, and Xue Lin. "Ag3PO4 nanocrystals and g-C3N4 quantum dots decorated Ag2WO4 nanorods: ternary nanoheterostructures for photocatalytic degradation of organic contaminants in water." RSC Advances 9, no. 14 (2019): 8065–72. http://dx.doi.org/10.1039/c8ra09815h.

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Abstract:

The ternary heterostructured Ag₃PO₄/g-C₃N₄/Ag₂WO₄ photocatalysts were successfully synthesized. The ternary composites exhibited enhanced photocatalytic activity.