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Journal articles on the topic 'Sulfur Dot'

Author: Grafiati

Published: 6 September 2023

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1

Li, Xueliang, Kuan Hu, Ruwen Tang, Kun Zhao, and Yunsheng Ding. "CuS quantum dot modified carbon aerogel as an immobilizer for lithium polysulfides for high-performance lithium–sulfur batteries." RSC Advances 6, no. 75 (2016): 71319–27. http://dx.doi.org/10.1039/c6ra11990e.

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CuS quantum dot (QD) modified carbon aerogels were successfully prepared via a facile and scalable method to encapsulate sulfur and polysulfides into the hierarchical porous channel of lithium–sulfur batteries.

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2

Brubaker, Cole D., Talitha M. Frecker, James R. McBride, Kemar R. Reid, G. Kane Jennings, Sandra J. Rosenthal, and Douglas E. Adams. "Incorporation of fluorescent quantum dots for 3D printing and additive manufacturing applications." Journal of Materials Chemistry C 6, no. 28 (2018): 7584–93. http://dx.doi.org/10.1039/c8tc02024h.

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3

Jian, Zhixu, Shichao Zhang, Xianggang Guan, Jiajie Li, Honglei Li, Wenxu Wang, Yalan Xing, and Huaizhe Xu. "ZnO quantum dot-modified rGO with enhanced electrochemical performance for lithium–sulfur batteries." RSC Advances 10, no. 54 (2020): 32966–75. http://dx.doi.org/10.1039/d0ra04986g.

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4

Veamatahau, Aisea, Bo Jiang, Tom Seifert, Satoshi Makuta, Kay Latham, Masayuki Kanehara, Toshiharu Teranishi, and Yasuhiro Tachibana. "Origin of surface trap states in CdS quantum dots: relationship between size dependent photoluminescence and sulfur vacancy trap states." Physical Chemistry Chemical Physics 17, no. 4 (2015): 2850–58. http://dx.doi.org/10.1039/c4cp04761c.

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5

Luo, Zhimin, Dongliang Yang, Guangqin Qi, Jingzhi Shang, Huanping Yang, Yanlong Wang, Lihui Yuwen, Ting Yu, Wei Huang, and Lianhui Wang. "Microwave-assisted solvothermal preparation of nitrogen and sulfur co-doped reduced graphene oxide and graphene quantum dots hybrids for highly efficient oxygen reduction." J. Mater. Chem. A 2, no. 48 (2014): 20605–11. http://dx.doi.org/10.1039/c4ta05096g.

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6

Yang, Ze, Juan Xiao, Jia-Yun Wan, Zhong-Guo Liu, Ting-Ting Cao, Wen-Jie Zhang, and Hang-Xing Wang. "Graphene oxide/carbon dot composite: a new photoelectrode material for photocurrent response enhancement." Physical Chemistry Chemical Physics 17, no. 48 (2015): 32283–88. http://dx.doi.org/10.1039/c5cp05616k.

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7

Yuan, Mingjian, Kyle W. Kemp, Susanna M. Thon, Jin Young Kim, Kang Wei Chou, Aram Amassian, and Edward H. Sargent. "High-Performance Quantum-Dot Solids via Elemental Sulfur Synthesis." Advanced Materials 26, no. 21 (March 21, 2014): 3513–19. http://dx.doi.org/10.1002/adma.201305912.

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8

Al Ghifari, Alvin Dior, Edi Sanjaya, and Isnaeni Isnaeni. "Pengaruh Doping Nitrogen, Sulfur, dan Boron terhadap Spektrum Absorbansi dan Fotoluminesensi Karbon Dot Asam Sitrat." Al-Fiziya: Journal of Materials Science, Geophysics, Instrumentation and Theoretical Physics 2, no. 2 (December 31, 2019): 93–101. http://dx.doi.org/10.15408/fiziya.v2i2.11787.

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Telah dilakukan sintesis karbon dot dengan bahan asam sitrat dengan metode pemanasan microwave. Sampel yang dibuat adalah sampel murni dan sampel yang diberi doping. Doping yang digunakan adalah HNO3 untuk doping Nitrogen (N), Na2S2O5 untuk doping Sulfur (S), dan H3BO3 untuk doping Boron (B). Pengujian optik yang dilakukan adalah Absorbansi UV-Vis dan Fotoluminesensi. Sampel karbon dot asam sitrat tanpa doping diuji terlebih dahulu, kemudian karbon dot doping-N, doping-S, dan doping-B diuji. Hasil yang didapat berupa spektrum absorbansi yang merupakan daya serap gelombang sampel yang diuji, dan spektrum fotoluminesensi yang merupakan pendaran sampel yang diuji. Spektrum sebelum pendopingan dibandingkan dengan spektrum setelah pendopingan. Dilakukan analisis perubahan sumbu-x yaitu pergeseran panjang gelombang, dan sumbu-y yaitu kenaikan atau penurunan nilai absorbansi dan intensitas fotoluminesensi. Hasil absorbansi karbon dot asam sitrat murni memiliki dua buah puncak (peak) absorbansi. Pendopingan N dan S tidak mempengaruhi spektrum absorbansi secara signifikan, namun pendopingan B sangat mempengaruhinya pada puncak kedua dengan menggeser 40 nm ke kanan dan menurunkan nilai absorbansi 1,68. Sedangkan hasil fotoluminesensi karbon dot asam sitrat murni memiliki sebuah puncak pada panjang gelombang 502 nm dengan intensitas 758 a.u., atau pendarannya berada dalam daerah warna cyan. Pendopingan N, S, dan B dapat menggeser spektrum fotoluminesensi ke arah warna merah dan nilai terbesar adalah dengan doping S yaitu sebesar 32 nm.

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9

Rasal, Akash S., Khalilalrahman Dehvari, Girum Getachew, Chiranjeevi Korupalli, Anil V. Ghule, and Jia-Yaw Chang. "Efficient quantum dot-sensitized solar cells through sulfur-rich carbon nitride modified electrolytes." Nanoscale 13, no. 11 (2021): 5730–43. http://dx.doi.org/10.1039/d0nr07963d.

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Polysulfide electrolytes with sulfur-rich graphitic carbon nitride additives are effective in various Cu-based I–III–VI quantum dot-sensitized solar cells, including Cu–In–S and Cu–In–Se, for improving power conversion efficiencies.

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10

Meng, Fanrong, Haoran Xu, Shuolin Wang, Jingxian Wei, Wengong Zhou, Qiang Wang, Peng Li, Fangong Kong, and Yucang Zhang. "One-step high-yield preparation of nitrogen- and sulfur-codoped carbon dots with applications in chromium(vi) and ascorbic acid detection." RSC Advances 12, no. 30 (2022): 19686–94. http://dx.doi.org/10.1039/d2ra01758j.

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A novel bio-based nitrogen- and sulfur-codoped carbon dot with enhanced synthetic yield and photoluminescence quantum yield for reversible detection of chromium (Cr)(vi) and ascorbic acid was fabricated by a one-pot hydrothermal method.

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11

Park, Joong Pill, Jin Hyuck Heo, Sang Hyuk Im, and Sang-Wook Kim. "Highly efficient solid-state mesoscopic PbS with embedded CuS quantum dot-sensitized solar cells." Journal of Materials Chemistry A 4, no. 3 (2016): 785–90. http://dx.doi.org/10.1039/c5ta08668j.

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We synthesized a new type of PbS colloidal quantum dot (QD) embedding CuS (PbS[CuS] QDs) by rapid injection of a sulfur precursor into a lead precursor solution followed by cation exchange of Pb with Cu ions.

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12

Nemati, Fatemeh, Morteza Hosseini, Rouholah Zare-Dorabei, and Mohammad Reza Ganjali. "Sensitive recognition of ethion in food samples using turn-on fluorescence N and S co-doped graphene quantum dots." Analytical Methods 10, no. 15 (2018): 1760–66. http://dx.doi.org/10.1039/c7ay02850d.

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To achieve a fast, sensitive and inexpensive method for the detection of ethion in the presence of Hg²⁺ ions, a nitrogen and sulfur co-doped graphene quantum dot (N,S/GQD)-based fluorescence sensing system was developed.

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13

Tang, Jingmin, Masanori Sakamoto, Haruhisa Ohta, and Ken-ichi Saitow. "1% defect enriches MoS2 quantum dot: catalysis and blue luminescence." Nanoscale 12, no. 7 (2020): 4352–58. http://dx.doi.org/10.1039/c9nr07612c.

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MoS₂ quantum dot, given by laser ablation, have 1% sulfur vacancies quantified by ESR as a functional defect. Very good catalyst, the shortest synthesis time, and room-temperature process are achieved against the top 10 papers of the HER of MoS₂.

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14

Fan, Shengnan, Xiaoqing Li, Fanghui Ma, Minghui Yang, Juan Su, and Xiang Chen. "Sulfur quantum dot based fluorescence assay for lactate dehydrogenase activity detection." Journal of Photochemistry and Photobiology A: Chemistry 430 (September 2022): 113989. http://dx.doi.org/10.1016/j.jphotochem.2022.113989.

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15

Fan, Shengnan, Xiaoqing Li, Fanghui Ma, Minghui Yang, Juan Su, and Xiang Chen. "Sulfur quantum dot based fluorescence assay for lactate dehydrogenase activity detection." Journal of Photochemistry and Photobiology A: Chemistry 430 (September 2022): 113989. http://dx.doi.org/10.1016/j.jphotochem.2022.113989.

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16

Yang, Zusing, Chia-Ying Chen, Chi-Wei Liu, and Huan-Tsung Chang. "Electrocatalytic sulfur electrodes for CdS/CdSe quantum dot-sensitized solar cells." Chemical Communications 46, no. 30 (2010): 5485. http://dx.doi.org/10.1039/c0cc00642d.

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17

Kurka, Vladislav, Zdeněk Kuboň, Ladislav Kander, Petr Jonšta, and Ondřej Kotásek. "The Effect of Bismuth on Technological and Material Characteristics of Low-Alloyed Automotive Steels with a Good Machinability." Metals 12, no. 2 (February 9, 2022): 301. http://dx.doi.org/10.3390/met12020301.

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The aim of this work is to compare the technological and material properties of CMnCr steels without bismuth, with 0.08 wt. % Bi and 0.12 wt. % Bi. Experimental heats showed that the most advantageous alloying of Bi into the heat was in the ladle, with an efficiency of about 20%. The optimal temperature range for forming steel was found to be 1160–1050 °C. With increasing Bi content, the formability of steels and plastic properties decreased, while the yield stress and tensile strength increased. Manganese sulfides, aluminum oxides, or oxysulfides, which were segregated both individually and in clusters, were found in the matrix of all tested steels. In steels with Bi, the Bi particles segregate the separately in the form of globules, either as envelopes of elongated MnS or Al2O3 particles segregated in rows. Sulfur dot-shaped segregations in the steel with 0.12 wt. % of Bi and the steel without Bi were essentially uniform over the whole area. For the steel with 0.08 wt. % of Bi, both dot-like and ray-ordered sulfur segregations were observed. The microstructure of all tested steels was ferritic–pearlitic with islands of bainite. Towards the center of the forged bars, variable shape and size of bainite blocks were observed. Machinability tests evaluated by the extend of tool wear showed that the most advantageous was CMnCr steel alloyed with 0.08 wt. % Bi.

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18

Clarke, Samuel, Randall E. Mielke, Andrea Neal, Patricia Holden, and Jay L. Nadeau. "Bacterial and Mineral Elements in an Arctic Biofilm: A Correlative Study Using Fluorescence and Electron Microscopy." Microscopy and Microanalysis 16, no. 2 (January 26, 2010): 153–65. http://dx.doi.org/10.1017/s1431927609991334.

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AbstractFew simple labeling methods exist for simultaneous fluorescence and electron microscopy of bacteria and biofilms. Here we describe the synthesis, characterization, and application of fluorescent nanoparticle quantum dot (QD) conjugates to target microbial species, including difficult to label Gram-negative strains. These QD conjugates impart contrast for both environmental scanning electron microscopy (ESEM) and fluorescence microscopy, permitting observation of living and fixed bacteria and biofilms. We apply these probes for studying biofilms extracted from perennial cold springs in the Canadian High Arctic, which is a particularly challenging system. In these biofilms, sulfur-metabolizing bacteria live in close association with unusual sulfur mineral formations. Following simple labeling protocols with the QD conjugates, we are able to image these organisms in fully-hydrated samples and visualize their relationship to the sulfur minerals using both ESEM and fluorescence microscopy. We then use scanning transmission electron microscopy to observe precipitated sulfur around individual cells and within the biofilm lattice. All combined, this information sheds light on the possible mechanisms of biofilm and mineral structure formation. These new QD conjugates and techniques are highly transferable to many other microbiological applications, especially those involving Gram-negative bacteria, and can be used for correlated fluorescence and electron microscopy.

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19

Li, Fei, Lang Sun, Yi Luo, Ming Li, Yongjie Xu, Guanghui Hu, Xinyu Li, and Liang Wang. "Effect of thiophene S on the enhanced ORR electrocatalytic performance of sulfur-doped graphene quantum dot/reduced graphene oxide nanocomposites." RSC Advances 8, no. 35 (2018): 19635–41. http://dx.doi.org/10.1039/c8ra02040j.

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20

Daniels, Craig, Patricia Godoy, Estrella Duque, M. Antonia Molina-Henares, Jesús de la Torre, José María del Arco, Carmen Herrera, et al. "Global Regulation of Food Supply by Pseudomonas putida DOT-T1E." Journal of Bacteriology 192, no. 8 (February 5, 2010): 2169–81. http://dx.doi.org/10.1128/jb.01129-09.

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ABSTRACT Pseudomonas putida DOT-T1E was used as a model to develop a “phenomics” platform to investigate the ability of P. putida to grow using different carbon, nitrogen, and sulfur sources and in the presence of stress molecules. Results for growth of wild-type DOT-T1E on 90 different carbon sources revealed the existence of a number of previously uncharted catabolic pathways for compounds such as salicylate, quinate, phenylethanol, gallate, and hexanoate, among others. Subsequent screening on the subset of compounds on which wild-type DOT-TIE could grow with four knockout strains in the global regulatory genes Δcrc, Δcrp, ΔcyoB, and ΔptsN allowed analysis of the global response to nutrient supply and stress. The data revealed that most global regulator mutants could grow in a wide variety of substrates, indicating that metabolic fluxes are physiologically balanced. It was found that the Crc mutant did not differ much from the wild-type regarding the use of carbon sources. However, certain pathways are under the preferential control of one global regulator, i.e., metabolism of succinate and d-fructose is influenced by CyoB, and l -arginine is influenced by PtsN. Other pathways can be influenced by more than one global regulator; i.e., l-valine catabolism can be influenced by CyoB and Crp (cyclic AMP receptor protein) while phenylethylamine is affected by Crp, CyoB, and PtsN. These results emphasize the cross talk required in order to ensure proper growth and survival. With respect to N sources, DOT-T1E can use a wide variety of inorganic and organic nitrogen sources. As with the carbon sources, more than one global regulator affected growth with some nitrogen sources; for instance, growth with nucleotides, dipeptides, d-amino acids, and ethanolamine is influenced by Crp, CyoB, and PtsN. A surprising finding was that the Crp mutant was unable to flourish on ammonium. Results for assayed sulfur sources revealed that CyoB controls multiple points in methionine/cysteine catabolism while PtsN and Crc are needed for N-acetyl-l-cysteamine utilization. Growth of global regulator mutants was also influenced by stressors of different types (antibiotics, oxidative agents, and metals). Overall and in combination with results for growth in the presence of various stressors, these phenomics assays provide multifaceted insights into the complex decision-making process involved in nutrient supply, optimization, and survival.

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21

Ngoc Anh, Nguyen Thi, Pei-Yi Chang, and Ruey-An Doong. "Sulfur-doped graphene quantum dot-based paper sensor for highly sensitive and selective detection of 4-nitrophenol in contaminated water and wastewater." RSC Advances 9, no. 46 (2019): 26588–97. http://dx.doi.org/10.1039/c9ra04414k.

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22

Lu, Haixin, Hanqiang Zhang, Yufei Li, and Feng Gan. "Sensitive and selective determination of tetracycline in milk based on sulfur quantum dot probes." RSC Advances 11, no. 37 (2021): 22960–68. http://dx.doi.org/10.1039/d1ra03745e.

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23

Wang, Shan, Xing Bao, Bei Gao, and Meng Li. "A novel sulfur quantum dot for the detection of cobalt ions and norfloxacin as a fluorescent “switch”." Dalton Transactions 48, no. 23 (2019): 8288–96. http://dx.doi.org/10.1039/c9dt01186b.

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Sulfur nanomaterials exceed carbon nanomaterials in terms of the antimicrobial or antifungal properties. A novel S QDs which were prepared by “top-down” methodology to detect Co²⁺and norfloxacin was constructed for the first time. S QDs can play a dual role for detection of Co²⁺as well as norfloxacin in aqueous media as a fluorescent switch.

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24

Wang, Xiaobin, Yuqing Zhao, Qing Hua, Jiaojiao Lu, Feiyan Tang, Wenjie Sun, Feng Luan, Xuming Zhuang, and Chunyuan Tian. "An ultrasensitive electrochemiluminescence biosensor for the detection of total bacterial count in environmental and biological samples based on a novel sulfur quantum dot luminophore." Analyst 147, no. 8 (2022): 1716–21. http://dx.doi.org/10.1039/d2an00153e.

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25

Ravenschlag, Katrin, Kerstin Sahm, Jakob Pernthaler, and Rudolf Amann. "High Bacterial Diversity in Permanently Cold Marine Sediments." Applied and Environmental Microbiology 65, no. 9 (September 1, 1999): 3982–89. http://dx.doi.org/10.1128/aem.65.9.3982-3989.1999.

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ABSTRACT A 16S ribosomal DNA (rDNA) clone library from permanently cold marine sediments was established. Screening 353 clones by dot blot hybridization with group-specific oligonucleotide probes suggested a predominance of sequences related to bacteria of the sulfur cycle (43.4% potential sulfate reducers). Within this fraction, the major cluster (19.0%) was affiliated with Desulfotalea sp. and other closely related psychrophilic sulfate reducers isolated from the same habitat. The cloned sequences showed between 93 and 100% similarity to these bacteria. Two additional groups were frequently encountered: 13% of the clones were related to Desulfuromonas palmitatis, and a second group was affiliated withMyxobacteria spp. and Bdellovibrio spp. Many clones (18.1%) belonged to the γ subclass of the classProteobacteria and were closest to symbiotic or free-living sulfur oxidizers. Probe target groups were further characterized by amplified rDNA restriction analysis to determine diversity within the groups and within the clone library. Rarefaction analysis suggested that the total diversity assessed by 16S rDNA analysis was very high in these permanently cold sediments and was only partially revealed by screening of 353 clones.

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26

Jahani, Ghazaleh, Masoume Malmir, and Majid M. Heravi. "Catalytic Oxidation of Alcohols over a Nitrogen- and Sulfur-Doped Graphitic Carbon Dot-Modified Magnetic Nanocomposite." Industrial & Engineering Chemistry Research 61, no. 5 (February 1, 2022): 2010–22. http://dx.doi.org/10.1021/acs.iecr.1c04198.

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27

Kang, Jin Soo, Jiho Kang, Jiyoung Chae, Yoon Jun Son, Juwon Jeong, Jin Kim, Jae-Yup Kim, Soon Hyung Kang, Kwang-Soon Ahn, and Yung-Eun Sung. "Vapor-Deposited Tungsten Carbide Nano-Dendrites as Sulfur-Tolerant Electrocatalysts for Quantum Dot-Sensitized Solar Cells." Journal of The Electrochemical Society 165, no. 14 (2018): H954—H961. http://dx.doi.org/10.1149/2.0911814jes.

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28

Chiu, Arlene, Eric Rong, Christianna Bambini, Yida Lin, Chengchangfeng Lu, and Susanna M. Thon. "Sulfur-Infused Hole Transport Materials to Overcome Performance-Limiting Transport in Colloidal Quantum Dot Solar Cells." ACS Energy Letters 5, no. 9 (August 18, 2020): 2897–904. http://dx.doi.org/10.1021/acsenergylett.0c01586.

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29

Li, Lu, Chao Yang, Yong Li, Yulun Nie, and Xike Tian. "Sulfur quantum dot-based portable paper sensors for fluorometric and colorimetric dual-channel detection of cobalt." Journal of Materials Science 56, no. 7 (November 9, 2020): 4782–96. http://dx.doi.org/10.1007/s10853-020-05544-z.

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30

Akhgari, Farhad, Naser Samadi, Khalil Farhadi, and Mehrdad Akhgari. "A green one-pot synthesis of nitrogen and sulfur co-doped carbon quantum dots for sensitive and selective detection of cephalexin." Canadian Journal of Chemistry 95, no. 6 (June 2017): 641–48. http://dx.doi.org/10.1139/cjc-2016-0531.

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The article reports a simple, economic, and green method for preparing water-soluble, nitrogen and sulfur co-doped carbon quantum dots via a one-step hydrothermal method. Pomegranate juice served as the carbon source, and the L-cysteine provided nitrogen and sulfur. Co-doped carbon dots were characterized by X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM), and Fourier transform infrared (FTIR) spectroscopy techniques. The co-doped carbon dots served as fluorescent probes for sensitive and selective detection of cephalexin. Briefly, the co-doped carbon dot systems showed quenching of photoluminescence intensity in the presence of cephalexin. The decrease of fluorescence intensity made it possible to analyze cephalexin with satisfactory detection limits and linear ranges. The Sterne–Volmer plot showed a linear relationship (R2 = 0.998) between F0/F and the concentration of cephalexin over the range from 0.3 to 10 μmol L−1. The limit of detection (LOD) was estimated to be 1 × 10−7 mol L−1 (at a signal to noise ratio of 3). To validate the applicability, the described method was successfully applied for the detection of cephalexin in human urine and raw milk samples.

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31

Favaro, Marco, Mattia Cattelan, Stephen W. T. Price, Andrea E. Russell, Laura Calvillo, Stefano Agnoli, and Gaetano Granozzi. "In Situ Study of Graphene Oxide Quantum Dot-MoSx Nanohybrids as Hydrogen Evolution Catalysts." Surfaces 3, no. 2 (June 16, 2020): 225–36. http://dx.doi.org/10.3390/surfaces3020017.

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Graphene quantum dots (GOQDs)-MoSx nanohybrids with different MoSx stoichiometries (x = 2 and 3) were prepared in order to investigate their chemical stability under hydrogen evolution reaction (HER) conditions. Combined photoemission/electrochemical (XPS/EC) measurements and operando X-ray absorption spectroscopy (XAS) were employed to determine the chemical changes induced on the MoSx-based materials as a function of the applied potential. This in situ characterization indicates that both MoS2 and MoS3 materials are stable under operating conditions, although sulfur terminal sites in the MoS3 nanoparticles are converted from S-dimer (S22−) to S-monomer (S2−), which constitute the first sites where the hydrogen atoms are adsorbed for their subsequent evolution. In order to complete the characterization of the GOQDs-MoSx nanohybrids, the composition and particle size were determined by X-ray photoemission spectroscopy (XPS), X-ray diffraction (XRD) and Raman spectroscopy; whereas the HER activity was studied by conventional electrochemical techniques.

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32

Martins, Eduardo Constante, Edson Roberto Santana, and Almir Spinelli. "Nitrogen and sulfur co-doped graphene quantum dot-modified electrode for monitoring of multivitamins in energy drinks." Talanta 252 (January 2023): 123836. http://dx.doi.org/10.1016/j.talanta.2022.123836.

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33

Fang Wang, Huiming Zhang, and Bin Xu. "Nitrogen and Sulfur Quantum Dot Co-Modified Graphene Nanosheet with Enhanced Photocatalytic Activity for Methyl Orange Degradation." Russian Journal of Physical Chemistry A 94, no. 11 (October 30, 2020): 2299–305. http://dx.doi.org/10.1134/s0036024420110333.

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34

Xu, Wenjiao, Yuxiu Sun, Bin Ding, and Jingbo Zhang. "Zeolitic-imidazolate frameworks derived Pt-free counter electrodes for high-performance quantum dot-sensitized solar cells." Royal Society Open Science 5, no. 5 (May 2018): 180335. http://dx.doi.org/10.1098/rsos.180335.

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Zeolitic-imidazole frameworks (ZIFs), as novel porous materials, are attracting much attention in several fields due to their special advantages such as large specific surface area, versatile porosity and well-connected networks. Here, we develop a porous ZIF-derived catalytic thin film, which was coated on the conducting glass as a counter electrode (CE) to substitute costly platinum for quantum dot-sensitized solar cells (QDSSCs). A ZIF layer is first prepared by coating ZIF-67 powders on the conducting glass, followed by the careful calcination treatments in sulfur vapour (sulfuration) or nitrogen gas (carbonization). The structure and morphologies of the derived porous film are characterized by the measurements of XRD, SEM and BET, and the electrochemical properties in the polysulfide solution are evaluated by the measurements of Tafel curves and electrochemical impedance spectroscopies. The derived porous film is used as a CE to fabricate QDSSC with CdSe quantum dot-sensitized TiO 2 nanocrystalline thin film and the polysulfide solution. Compared with the photovoltaic performance of CdSe QDSSCs based on the CE prepared by the different sulfuration conditions, QDSSC based on the CE derived by the sulfuration for 30 min shows an excellent light-to-electric conversion efficiency of 3.77%, it is even higher than that of QDSSC based on Pt CE (2.98%). This work will open a new avenue to design a facile, low-cost and renewable CE for QDSSC.

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35

Xiao, Tingjiao, Fengjin Yi, Mingzhi Yang, Weiliang Liu, Mei Li, Manman Ren, Xu Zhang, and Zhen Zhou. "A composite of CoNiP quantum dot-decorated reduced graphene oxide as a sulfur host for Li–S batteries." Journal of Materials Chemistry A 9, no. 31 (2021): 16692–98. http://dx.doi.org/10.1039/d1ta03608d.

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36

Hmar, Jehova Jire L., Tanmoy Majumder, Saurab Dhar, and Suvra Prakash Mondal. "Sulfur and Nitrogen co-doped graphene quantum dot decorated ZnO nanorod/polymer hybrid flexible device for photosensing applications." Thin Solid Films 612 (August 2016): 274–83. http://dx.doi.org/10.1016/j.tsf.2016.06.014.

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37

Li, Yue, Jia Wang, Yaqiong Yang, and Suqin Han. "Sulfur and nitrogen co‐doped graphene quantum dot‐assisted chemiluminescence for sensitive detection of tryptophan and mercury (II)." Luminescence 35, no. 5 (January 26, 2020): 773–80. http://dx.doi.org/10.1002/bio.3783.

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38

Chen, Hongyan, Guoli Fu, Xupeng Xu, Xuming Xu, Wenqi Ju, Zengsheng Ma, Xinming Wang, and Weixin Lei. "NiO quantum dot-modified high specific surface carbon aerogel materials as an advanced host for lithium-sulfur batteries." Electrochimica Acta 467 (November 2023): 143087. http://dx.doi.org/10.1016/j.electacta.2023.143087.

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39

Majumder, Tanmoy, Saurab Dhar, Pinak Chakraborty, Kamalesh Debnath, and Suvra Prakash Mondal. "S, N Co-Doped Graphene Quantum Dots Decorated C-Doped ZnO Nanotaper Photoanodes for Solar Cells Applications." Nano 14, no. 01 (January 2019): 1950012. http://dx.doi.org/10.1142/s1793292019500127.

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Sulfur and nitrogen co-doped graphene quantum dots (SNGQDs) were synthesized using a hydrothermal method. The doping of S, N atoms and chemical bonding in SNGQDs has been investigated by XPS measurements. Our as-grown SNGQDs showed strong UV (wavelength [Formula: see text]261–341[Formula: see text]nm) and visible absorption (wavelength [Formula: see text]261–341[Formula: see text]nm) and demonstrated excitation-dependent photoemission in visible spectrum. Photoelectrochemical and photovoltaic properties of SNGQDs sensitized carbon-doped ZnO nanotaper (C-ZnO NT) photoanodes has been studied in detail. SNGQD sensitized photoanodes demonstrated superior photoconversion efficiency ([Formula: see text]1.46% and incident-photon-to-current conversion efficiency (IPCE) [Formula: see text]92.48% at 340[Formula: see text]nm. Quantum dot sensitized solar cells (QDSSCs) has been fabricated using SNGQDs sensitized C-ZnO NT photoandoes and demonstrated maximum power conversion efficiency ([Formula: see text]0.59%.

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Coolen, Marco J. L., and Jörg Overmann. "Analysis of Subfossil Molecular Remains of Purple Sulfur Bacteria in a Lake Sediment." Applied and Environmental Microbiology 64, no. 11 (November 1, 1998): 4513–21. http://dx.doi.org/10.1128/aem.64.11.4513-4521.1998.

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ABSTRACT Molecular remains of purple sulfur bacteria (Chromatiaceae) were detected in Holocene sediment layers of a meromictic salt lake (Mahoney Lake, British Columbia, Canada). The carotenoid okenone and bacteriophaeophytin awere present in sediments up to 11,000 years old. Okenone is specific for only a few species of Chromatiaceae, includingAmoebobacter purpureus, which presently predominates in the chemocline bacterial community of the lake. With a primer set specific for Chromatiaceae in combination with denaturing gradient gel electrophoresis, 16S rRNA gene sequences of four different Chromatiaceae species were retrieved from different depths of the sediment. One of the sequences, which originated from a 9,100-year-old sample, was 99.2% identical to the 16S rRNA gene sequence of A. purpureus ML1 isolated from the chemocline. Employing primers specific for A. purpureus ML1 and dot blot hybridization of the PCR products, the detection limit for A. purpureus ML1 DNA could be lowered to 0.004% of the total community DNA. With this approach the DNA of the isolate was detected in 7 of 10 sediment layers, indicating that A. purpureus ML1 constituted at least a part of the ancient purple sulfur bacterial community. The concentrations of A. purpureus DNA and okenone in the sediment were not correlated, and the ratio of DNA to okenone was much lower in the subfossil sediment layers (2.7 · 10−6) than in intact cells (1.4). This indicates that degradation rates are significantly higher for genomic DNA than for hydrocarbon cell constituents, even under anoxic conditions and at the very high sulfide concentrations present in Mahoney Lake.

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Thon, Susanna Mitrani, Arlene Chiu, Yida Lin, Hoon Jeong Lee, Sreyas Chintapalli, and Botong Qiu. "(Keynote) New Materials and Spectroscopies for Colloidal Quantum Dot Solar Cells." ECS Meeting Abstracts MA2022-02, no. 20 (October 9, 2022): 918. http://dx.doi.org/10.1149/ma2022-0220918mtgabs.

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Colloidal quantum dots (CQDs) are an attractive third-generation material for photovoltaics due to their solution-processability, lightweight and flexible nature, and bandgap tunability, allowing them to be used as infrared materials for multi-junction solar cells. Here, we describe several methods for building new lead sulfide-based CQD materials and thin films for improving efficiencies in both single-junction and multi-junction solar cells. First, we demonstrate that the power conversion efficiency in single-junction PbS CQD solar cells is limited in part by the performance of the hole transport layer (HTL), traditionally made from ethanedithiol-passivated lead sulfide CQDs, due to the sub-optimal carrier mobility and doping density in this material. We use sulfur doping of the HTL, as well as incorporation of 2D transition metal dichalcogenide nanoflakes to address these issues and demonstrate absolute power conversion efficiency improvements of greater than 1% in single-junction devices. Next, we demonstrate a micrometer-resolution 2D characterization method with millimeter-scale field of view for assessing CQD solar cell film quality and uniformity. Our instrument simultaneously collects photoluminescence spectra, photocurrent transients, and photovoltage transients. We use this high-resolution morphology mapping to quantify the distribution and strength of the local optoelectronic property variations in CQD solar cells due to film defects, physical damage, and contaminants across nearly the entire test device area, and the extent to which these variations account for overall performance losses. We also use the massive data sets produced by this method to train machine learning models that take as input simple illuminated current-voltage measurements and output complex underlying materials parameters, greatly simplifying the characterization process for optoelectronic devices. Finally, we use artificial photonic band engineering as a method for achieving spectral selectivity in absorbing PbS CQD thin films for applications in multi-junction photovoltaics. We show that a structured periodic CQD thin film is able to maintain a photonic band structure, including the existence of a reduced photonic density of states, in the presence of weak material absorption, enabling modification of the absorption, transmission, and reflection spectra. We use a machine learning-based inverse design process to generate CQD thin film photonic structures with targeted absorption, transmission, and reflection spectra for multi-junction photovoltaics and narrow bandwidth photodetectors.

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Lu, Haochen, Qiubo Guo, Qi Fan, Liang Xue, Xingyu Lu, Feng Zan, and Hui Xia. "Cobalt sulfide quantum dot embedded in nitrogen/sulfur-doped carbon nanosheets as a polysulfide barrier in Li-S batteries." Journal of Alloys and Compounds 870 (July 2021): 159341. http://dx.doi.org/10.1016/j.jallcom.2021.159341.

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Zhang, Jianli, Yun Cheng, Haibo Chen, Yang Wang, Qiang Chen, Guangya Hou, Ming Wen, and Yiping Tang. "MoP Quantum Dot-Modified N,P-Carbon Nanotubes as a Multifunctional Separator Coating for High-Performance Lithium–Sulfur Batteries." ACS Applied Materials & Interfaces 14, no. 14 (March 31, 2022): 16289–99. http://dx.doi.org/10.1021/acsami.2c02212.

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Zeng, Peng, Hao Yu, Hong Liu, Yongfang Li, Ziyi Zhou, Xi Zhou, Changmeng Guo, et al. "Enhancing Reaction Kinetics of Sulfur-Containing Species in Li-S Batteries by Quantum Dot-Level Tin Oxide Hydroxide Catalysts." ACS Applied Energy Materials 4, no. 5 (April 20, 2021): 4935–44. http://dx.doi.org/10.1021/acsaem.1c00513.

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Li, Ling, Xichuan Yang, Wenming Zhang, Huayan Zhang, and Xiaowei Li. "Boron and sulfur co-doped TiO2 nanofilm as effective photoanode for high efficiency CdS quantum-dot-sensitized solar cells." Journal of Power Sources 272 (December 2014): 508–12. http://dx.doi.org/10.1016/j.jpowsour.2014.08.116.

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Li, Wenhua, Guoqiang Long, Qianqiao Chen, and Qin Zhong. "High-efficiency layered sulfur-doped reduced graphene oxide and carbon nanotube composite counter electrode for quantum dot sensitized solar cells." Journal of Power Sources 430 (August 2019): 95–103. http://dx.doi.org/10.1016/j.jpowsour.2019.05.020.

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Liu, Yongfeng, Xiuwen Shao, Zhaoju Gao, Xiaolin Zhu, Zhangcheng Pan, Yupeng Ying, Jinpeng Yang, Wei Pei, and Jia Wang. "Sulfur quantum dot as a fluorescent nanoprobe for Fe3+ ions: Uncovering of detection mechanism, high sensitivity, and large detection range." Journal of Luminescence 257 (May 2023): 119693. http://dx.doi.org/10.1016/j.jlumin.2023.119693.

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Nasrin, Fahmida, Kenta Tsuruga, Doddy Irawan Setyo Utomo, Ankan Dutta Chowdhury, and Enoch Y. Park. "Design and Analysis of a Single System of Impedimetric Biosensors for the Detection of Mosquito-Borne Viruses." Biosensors 11, no. 10 (October 7, 2021): 376. http://dx.doi.org/10.3390/bios11100376.

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The treatment for mosquito-borne viral diseases such as dengue virus (DENV), zika virus (ZIKV), and chikungunya virus (CHIKV) has become difficult due to delayed diagnosis processes. In addition, sharing the same transmission media and similar symptoms at the early stage of infection of these diseases has become more critical for early diagnosis. To overcome this, a common platform that can identify the virus with high sensitivity and selectivity, even for the different serotypes, is in high demand. In this study, we have attempted an electrochemical impedimetric method to detect the ZIKV, DENV, and CHIKV using their corresponding antibody-conjugated sensor electrodes. The significance of this method is emphasized on the fabrication of a common matrix of gold–polyaniline and sulfur, nitrogen-doped graphene quantum dot nanocomposites (Au-PAni-N,S-GQDs), which have a strong impedimetric response based only on the conjugated antibody, resulting in minimum cross-reactivity for the detection of various mosquito-borne viruses, separately. As a result, four serotypes of DENV and ZIKV, and CHIKV have been detected successfully with an LOD of femtogram mL−1.

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Lee, YC, MH Buraidah, and HJ Woo. "Poly(acrylamide-co-acrylic acid) gel polymer electrolyte incorporating with water-soluble sodium sulfide salt for quasi-solid-state quantum dot-sensitized solar cell." High Performance Polymers 32, no. 2 (March 2020): 183–91. http://dx.doi.org/10.1177/0954008320902232.

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Rapid decay of photoanode, leakage from sealant, and evaporation of electrolyte are always the major concerns of quantum dot-sensitized solar cells (QDSCs) based on liquid electrolyte. Subsequently, gel polymer electrolyte (GPE) appears as an attractive solution in addition to lower cost, lighter weight, and flexibility. Poly(acrylamide- co-acrylic acid) (PAAm-PAA) is of special interest to act as a polymer host to entrap liquid electrolyte because it provides high transparency, good gelatinizing properties, and excellent compatibility with the liquid electrolyte. In this work, the electrical and transport properties of PAAm-PAA GPE incorporating with water-soluble sodium sulfide were characterized by impedance spectroscopy. An increment of ionic conductivity was observed with the incorporation of ethylene carbonate (EC) and potassium chloride (KCl). The highest room temperature ionic conductivity of PAAm-PAA GPE is 70.82 mS·cm−1. QDSC based on PAAm-PAA GPE with the composition of 1.3 wt% of KCl, 0.9 wt% of EC, 55.3 wt% of PAAm-PAA, 38.5 wt% of sodium sulfide, and 4.0 wt% of sulfur can present up to 1.80% of light-to-electricity conversion efficiency.

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Zheng, Guihua, Shiyao Li, Ting Zhang, Feiyun Zhu, Jing Sun, Shuangjiang Li, and Linfeng You. "Water Pollution Control and Treatment Based on Quantum Dot Chemical and Biological High-Sensitivity Sensing." Journal of Sensors 2021 (October 28, 2021): 1–10. http://dx.doi.org/10.1155/2021/8704363.

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Inorganic pollutants in water can have an important impact on ecosystems and human health, so the development of rapid and sensitive detection methods for typical inorganic pollutants in water samples is important for understanding the pollution status of the water environment, as well as water pollution prevention and protection of drinking water safety. Fluorescence sensing technology has the advantages of fast response, high sensitivity, simple operation, and low cost but still has the problems of low quantum yield, cumbersome construction process, and limited practical applications. Based on the excellent fluorescence properties, a series of fluorescence sensing was constructed for the rapid, highly sensitive, and selective detection of various typical inorganic pollutants in water. And the related fluorescence sensing mechanism was investigated in this paper. In this paper, nitrogen/sulfur codoped carbon quantum dots (N, S-CQDs) were prepared for the sensitive and selective detection of sulfide and ferric ion. The blue fluorescent N, S-CQDs were prepared by a one-step hydrothermal method using ammonium citrate and L-cysteine as raw materials, which have excitation wavelength dependence and fluorescence quantum yield of 16.1% for the selective detection of sulfides with a detection limit ( S / N = 3 ) of 11.0 nM (about 0.35 μg/L). CQDs with significantly higher fluorescence quantum yields (69%) and no excitation dependence were prepared when citric acid was used instead of ammonium citrate and were used for the selective detection of ferric ion with a detection limit of 14.0 nM (~0.8 μg/L). The method has been successfully applied to the determination of total phosphorus in surface water and human urine, and the fluorescence color change of the dual-emission sensing can be used for the naked-eye identification and semiquantitative detection of phosphate.

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