Готові списки джерел за темами / MOLYBDENUM DISULFIDE NANOSHEETS

Добірка наукової літератури з теми "MOLYBDENUM DISULFIDE NANOSHEETS"

Автор: Grafiati

Опубліковано: 11 вересня 2023

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Статті в журналах з теми "MOLYBDENUM DISULFIDE NANOSHEETS"

pang, Bo, Lihong Jin, and Liying Wang. "Research on Targeted Thermal Effect of Molybdenum Disulfide Nanosheets Modified by Nucleic Acid Aptamers." E3S Web of Conferences 185 (2020): 04003. http://dx.doi.org/10.1051/e3sconf/202018504003.

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In this paper, the surface of molybdenum disulfide nanosheets synthesized by hydrothermal method was modified with bovine serum albumin (BSA) and nucleic acid aptamers in order to construct a photothermal system with high target recognition, stable size, good biocompatibility and low toxicity Nano material molybdenum disulfide; Under 808 nm laser irradiation, suitable functionalized molybdenum disulfide nanosheets can produce singlet oxygen at an effective concentration for photodynamic therapy, and at the same time, photothermal therapy can also be used to achieve synergistic therapy and the therapeutic effect is more excellent. This shows that such functionalized molybdenum disulfide nanosheets have excellent therapeutic effect and great potential in tumor treatment.

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Ogilvie, Sean P., Matthew J. Large, Hannah J. Wood, Aline Amorim Graf, Frank Lee, Jonathan P. Salvage, Alice A. K. King, and Alan B. Dalton. "Size selection and thin-film assembly of MoS₂ elucidates thousandfold conductivity enhancement in few-layer nanosheet networks." Nanoscale 14, no. 2 (2022): 320–24. http://dx.doi.org/10.1039/d1nr05815k.

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Here, few-layer molybdenum disulfide nanosheets are assembled by Langmuir deposition into thin films, and size selection is shown to lead to a thousandfold conductivity enhancement with potential applicability to all nanosheet networks.

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Huang, Wenjing, Yuta Sunami, Hiroshi Kimura, and Sheng Zhang. "Applications of Nanosheets in Frontier Cellular Research." Nanomaterials 8, no. 7 (July 12, 2018): 519. http://dx.doi.org/10.3390/nano8070519.

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Several types of nanosheets, such as graphene oxide (GO) nanosheet, molybdenum disulfide (MoS2) and poly(l-lactic acid) (PLLA) nanosheets, have been developed and applied in vitro in cellular research over the past decade. Scientists have used nanosheet properties, such as ease of modification and flexibility, to develop new cell/protein sensing/imaging techniques and achieve regulation of specific cell functions. This review is divided into three main parts based on the application being examined: nanosheets as a substrate, nanosheets as a sensitive surface, and nanosheets in regenerative medicine. Furthermore, the applications of nanosheets are discussed, with two subsections in each section, based on their effects on cells and molecules. Finally, the application prospects of nanosheets in cellular research are summarized.

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Amorim Graf, Aline, Matthew J. Large, Sean P. Ogilvie, Yuanyang Rong, Peter J. Lynch, Giuseppe Fratta, Santanu Ray, et al. "Sonochemical edge functionalisation of molybdenum disulfide." Nanoscale 11, no. 33 (2019): 15550–60. http://dx.doi.org/10.1039/c9nr04974f.

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We demonstrate the spontaneous edge functionalisation of molybdenum disulfide nanosheets exfoliated in acetone. Formation of molybdenum oxides explains the observed high-quality and stability of the dispersion in a low boiling point solvent.

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Wang, Fangping, Guifang Li, Jinfeng Zheng, Jing Ma, Caixia Yang, and Qizhao Wang. "Hydrothermal synthesis of flower-like molybdenum disulfide microspheres and their application in electrochemical supercapacitors." RSC Advances 8, no. 68 (2018): 38945–54. http://dx.doi.org/10.1039/c8ra04350g.

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Three-dimensional flower-like molybdenum disulfide microspheres composed of nanosheets were prepared by a hydrothermal method using ammonium molybdate as the molybdenum source and thiourea as the sulfur source.

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Sabarinathan, M., S. Harish, J. Archana, M. Navaneethan, H. Ikeda, and Y. Hayakawa. "Controlled exfoliation of monodispersed MoS2 layered nanostructures by a ligand-assisted hydrothermal approach for the realization of ultrafast degradation of an organic pollutant." RSC Advances 6, no. 111 (2016): 109495–505. http://dx.doi.org/10.1039/c6ra24355j.

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Ganesha, H., S. Veeresh, Y. S. Nagaraju, M. Vandana, M. Basappa, H. Vijeth, and H. Devendrappa. "2-Dimensional layered molybdenum disulfide nanosheets and CTAB-assisted molybdenum disulfide nanoflower for high performance supercapacitor application." Nanoscale Advances 4, no. 2 (2022): 521–31. http://dx.doi.org/10.1039/d1na00664a.

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Maachou, Lahcene, Kun Qi, Eddy Petit, Zhaodan Qin, Yang Zhang, Didier Cot, Valérie Flaud, et al. "Biomimetic electro-oxidation of alkyl sulfides from exfoliated molybdenum disulfide nanosheets." Journal of Materials Chemistry A 8, no. 47 (2020): 25053–60. http://dx.doi.org/10.1039/d0ta09045j.

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Sri Abirami Saraswathi, Meenakshi Sundaram, Dipak Rana, Prabu Vijayakumar, Subbiah Alwarappan, and Alagumalai Nagendran. "Tailored PVDF nanocomposite membranes using exfoliated MoS2 nanosheets for improved permeation and antifouling performance." New Journal of Chemistry 41, no. 23 (2017): 14315–24. http://dx.doi.org/10.1039/c7nj03193a.

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Yang, Lei, Alolika Mukhopadhyay, Yucong Jiao, Jonathan Hamel, Mourad Benamara, Yingjie Xing, and Hongli Zhu. "Aligned and stable metallic MoS2 on plasma-treated mass transfer channels for the hydrogen evolution reaction." Journal of Materials Chemistry A 5, no. 48 (2017): 25359–67. http://dx.doi.org/10.1039/c7ta08400e.

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Більше джерел

Дисертації з теми "MOLYBDENUM DISULFIDE NANOSHEETS"

Lee, Ting-Wei, and 李定偉. "Fate of Molybdenum Disulfide Nanosheets in the Aquatic Environment." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/mxv3k8.

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Анотація:

碩士
國立中興大學
環境工程學系所
106
The applications of two-dimensional transition metal dichalcogenides, including molybdenum disulfide (MoS2), have been developing rapidly, due to their unique optoelectronics properties. With different synthesis methods, the semiconducting 2H- and the metallic 1T-MoS2 can be synthesized. However, the environmental implications of these materials remain largely unknown. In this study, we study the short-term and long-term stability of MoS2 nanosheets concurrently with the presence of dissolved organic matter (DOM, e.g., Suwannee River natural organic matter (NOM) and Aldrich humic acid (HA)) under dark or sunlight-irradiated conditions in the aquatic environment. The results indicate that HA quickly binds with MoS2 nanosheets through Mo-C bonding onto MoS2 nanosheets surface. The oxidative deterioration and the phase transformation, 1T to 2H, of MoS2 nanosheets are retarded in the presence of NOM. In the dissolution experiments, MoS2 nanosheets with DOM species have less total mobilized concentration of Mo (TMC of Mo) under dark condition. By contrast, MoS2 nanosheets have enhanced TMC of Mo by adding HA under sunlight irradiation. Overall, the results suggest that the chemical stability and reactivity of MoS2 nanosheets depend on the dispersing media and the types of concurrent DOM in the environment; HA could react with MoS2 directly, while, NOM may protect MoS2 from oxidation and phase transformation.

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KAKOTY, NIMISHA. "SYNTHESIS AND STRUCTURAL CHARACTERIZATION OF MOLYBDENUM DISULFIDE NANOSHEET." Thesis, 2016. http://dspace.dtu.ac.in:8080/jspui/handle/repository/14871.

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The search for monolayer materials to substitute silicon in electronic devices has widened in the past decade. Despite the benefits of two dimensional graphene, it has no band gap and behaves as a semi-metal. Molybdenum disulphide is a promising material as it boasts a band gap of up to 1.9eV in a monolayer form. In this project, an inexpensive method of fabricating monolayer MoS2 is designed and growths on Si-substrates for future use in electronic devices will be attempted with this fabrication method

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Wang, Shih-Pang, and 王世邦. "Fabrication and Characterization of Solid-State Nanopores on Molybdenum Disulfide Nanosheets for DNA Translocation." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/wquxpr.

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Zhang, Xin-Quan, and 張鋅權. "Synthesis, Characterization, and Applications of Few Layered Boron Carbonitride, Boron Nitride, and Molybdenum Disulfide Nanosheets." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/44105058306800183852.

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Анотація:

碩士
東海大學
化學系
101
It was since 2004 that Prof. Andre Geim and Dr. Konstantin Novoselov used mechanical exfoliation method to gain monolayered graphite ---graphene. They have found it has significant electronic behavior and mechanical strength, and opened a route to study the optical and electric behaviors and application of few layered inorganic materials. This study focus on the synthesis of BCN nanosheets via chemical decoration of graphene oxide, hydrothermal exfoliations of boron nitride with the aid of hydrogen peroxide, and the synthesis of few layered structure of molybdenum disulfide by CVD process. In Chapter 1, it is about the basic structure, characteristics and recently progress of graphene, boron carbonitride, boron nitride and molybdenum disulfide nanosheets. In Chapter 2, it is about the experimental sections and investigating instrument. Chapter 3 is about the synthesis of BCN nanosheets, we have successfully doped GO nanosheets with BN via partial substitution of carbon atoms in graphene by boron and nitrogen atoms. Based on the XPS data, the doping concentration of BN increases with the increasing of the reaction temperature. Furthermore, we found that the use of gaseous ammonia allows the doping of graphene allows the doping of graphene with BN to be carried out at the lower temperature. The Raman spectra of the BCN sample synthesized at the various temperatures showed that I(D)/I(G) ratio is proportional to the doping concentration of BN in graphene. Furthermore, the estimate value of graphene nanocrystallite size decreases with the increase in the degree of doping in graphene. Finally, UV spectra of BCN sample with various doping concentration of BN have verified that the band gap of graphene is opened and dependent on atomic composition in nanosheets. For the electrical measurements, we will fabricate the bottom gated field-effect transistors by using the BN-doped graphene. For the studies of BN domain distribution in graphene, we will characterize the BCN samples by using electron energy loss spectroscopy. It is expected that the difference in current between graphene and BN domain can be observed. Chapter 4 is the synthesis of BN nanosheets, we have succesfully decorate BN with OH group via hydrothermal reactions with hydrogen peroxide, and sequentially exfoliated via sonication to gain BN nanosheets. Based on the AFM data, lateral size and height of BN nanosheets decreaes with increasing the reaction temperature.UV spectra of BN nanosheets have verified increased solubility with increased OH group . Finally, we use BN nanosheets to absorb perylene-3,4,9,10-tetracarboxylic acid tetrapotassium salt (PTAS) molecule with π-π interaction and desorption with KOH. We found that with the increase of OH concentration desorption concentration decreases caused by blocking of OH group. Chapter 5 is the synthesis of MoS2 layered structure, large-area MoS2 films are directly synthesized on SiO2/Si substrates with chemical vapor deposition. It is noteworthy that the growth of MoS2 is not unique to SiO2 substrates and it is also observed on other insulating substrates such as sapphire. The as-synthesized films are consisted of monolayer, bilayer and other few-layer MoS2. Chemical configurations, including stoichiometry and valence states of MoS2 layers are confirmed with XPS. Raman spectra and PL performance of the monolayer MoS2 are presented. TEM and SAED demonstrate that the monolayer MoS2 exhibits six-fold symmetry hexagonal lattice and high crystallinity. The electric measurement for the bottom-gate transistor shows a N-type semiconductor behavior and the on-off current ratio is approximately 1 x 104. The seeding approach can be further used to grow other transition metal dichalcogenides. Finally, Chapter 6 is the conclusion and future work.

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Huang, Yi-Jiun, and 黃義鈞. "Doping Zinc Oxide with Molybdenum or Tungsten Disulfide Nanosheets as Electron Transport Layers for Polymer with Fullerene or Small Molecule Photovoltaics." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/c7z7k5.

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Анотація:

博士
國立交通大學
材料科學與工程學系所
107
In organic photovoltaic (OPV) devices, more effective transfer of dissociated electrons and holes from the active layer to the respective electrodes will result in higher fill factors (FF) and short-circuit current densities (Jsc) and, thus, enhanced power conversion efficiencies (PCE). The PCE of OPVs is affected not only by active layer but also transport layer. In my study, I specialize in developing the electron transport layer (ETL) by doping two-dimensional (2D) transition-metal dichalcogenide (TMD) materials for OPV devices. In the first part study, we incorporated molybdenum disulfide (MoS2) nanosheets into sol–gel processing of zinc oxide (ZnO) to form ZnO:MoS2 composites for use as ETLs in inverted polymer solar cells featuring a binary bulk heterojunction active layer. We could effectively tune the energy band of the ZnO:MoS2 composite film from 4.45 to 4.22eV by varying the content of MoS2 up to 0.5 wt%, such that the composite was suitable for use in bulk heterojunction photovoltaic devices based on poly[bis(5-(2-ethylhexyl)thien-2-yl)benzodithiophene–alt–(4-(2-ethylhexyl)-3-fluorothienothiophene)-2-carboxylate-2,6-diyl)] (PTB7-TH):phenyl-C71-butryric acid methyl ester (PC71BM). In particular, the PCE of the PTB7-TH:PC71BM (1:1.5, w/w) device incorporating the ZnO:MoS2 (0.5 wt%) composite layer as the ETL was 10.1%, up from 8.8% for the corresponding device featuring ZnO alone as the ETL—a relative increase of 15%. Incorporating a small amount of MoS2 nanosheets into the ETL altered the morphology of the ETL and resulted in enhanced current densities, fill factors, and PCEs for the devices. We used ultraviolet photoelectron spectroscopy (UPS), synchrotron grazing-incidence wide-/small-angle X-ray scattering (GIWAXS/GISAXS), atomic force microscopy (AFM), and transmission electron microscopy (TEM) to characterize the energy band structures, internal structures, surface roughness, and morphologies, respectively, of the ZnO:MoS2 composite films. For the second part study, a new universal ETL that involves doping hydrogen-plasma treated tungsten disulfide (WS2) nanosheets into ZnO for polymer/fullerene or small molecule OPVs was prepared. A hydrogen-plasma treatment was used to alter the structures of WS2 nanosheets such that the W6+ content was converted into W4+; then ZnO:WS2 nanosheets composites were prepared to form ETLs. The energy band of the ZnO:WS2 films could be tuned from 5.15 to 4.60 eV by varying the concentration of the WS2 nanosheets up to 0.5 wt%. It was found that ZnO:WS2 ETLs exhibited superior charge transport properties than those of the pristine ZnO layer because of the structure changes, as determined from the X-ray scattering characterizations. OPVs incorporating active layers of PTB7-TH/PC71BM and PTB7-TH/IDIC blends exhibited their power conversion efficiencies of 10.3% and 6.7%, respectively, with the incorporation of 0.3 wt% of the WS2 nanosheets, up from 8.9% and 5.4% for the corresponding devices featuring pristine ZnO—relative increases of 16% and 24%, respectively. This study demonstrates the effectiveness of hydrogen-plasma treatment for altering the surface structures of 2D TMD nanosheets, and paves a way for the composite ETLs for use in OPVs.

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Chen, Cian-Yu, and 陳芊宇. "Molecular Simulation Study of Poly (ether-block-amide) Based Mix Matrix Membranes Incorporating 2D Molybdenum Disulfide Nanosheets for Carbon Dioxide Capture Enhancement." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/cv9hv4.

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Анотація:

碩士
國立臺灣大學
化學工程學研究所
107
In recent years, two-dimensional materials have widely been used to replace traditional fillers in mix matrix membranes (MMMs). With high affinity for carbon dioxide (CO2), molybdenum disulfide (MoS2) provides great potential to produce MMMs with high permeability and sufficient selectivity in gas separation application. However, it is still a challenge to estimate the performance of using MoS2 as functional fillers in MMMs due to the complex structure. An aim of our study is to develop a methodology to appropriately simulate MoS2-contained MMMs system and also predict the separation performance. We modified the force field parameters in PCFF, which is built in commercial software Materials Studio 2017 R2, and applied the restraint method for a better description of MoS2 nanosheet structure. In this study, Pebax-1657 was chosen as the polymer matrix and a series of MMMs models with MoS2 loading ranging from 0wt% to 20wt% were constructed. By applying molecular dynamics (MD) and Monte Carlo (MC) simulations, we respectively determined the diffusivity and solubility coefficient of CO2 and N2 within the MMMs. Then, to investigate the influence of MoS2 loading on the performance, the permeability via the solution-diffusion mechanism for each gas as well as the ideal gas selectivity for binary gas mixtures were examined. The results reveal that the addition of MoS2 could significant increase the solubility of CO2 at low loading and the upward trend seems to level off with additional loading to 20wt%. Compared to the results of diffusivity, it was found that the solution step dominates the solution-diffusion process. By increasing the MoS2 loading from 0wt% to 20wt%, the permeability of CO2 significantly increased from 32.05 to 129.64 Barrer without sacrificing the permeability selectivity of CO2/N2. Therefore, our results indicate that, at appropriate MoS2 loading, the incorporation of MoS2 could enhance the CO2 capture performance of Pebax-1657 membrane. Our study provides a method to build representative MoS2-contained MMMs models and predict the performance. The results can help followers to efficiently conduct the experiment and design MMMs of other polymer bases as well.

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Ali, Rajab S. K. "Engineering of Nanomaterials: Application in Antibacterial Activity, Bio-Analyte Detection and Environmental Remediation." Thesis, 2023. https://etd.iisc.ac.in/handle/2005/6071.

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Infectious diseases caused by pathogenic bacteria are creating a global health problem. In the recent report of World Health Organization (WHO), it has been mentioned that around 7 lacks people are dying each year worldwide due to drug resistant microbials. After discovery of the lifesaving “wonder drug” molecule penicillin, it was extensively used for the treatment of bacterial infection diseases. However, the excessive use of antibiotics leads to the development of antimicrobial resistance in the pathogenic bacterial strains to overcome the bactericidal effect of antibiotics. The drug-resistance bacteria follow multiple pathways to show resistance towards the existing antimicrobial agents and eventually make them abortive. The prevalence of these drug resistant bacterial strains poses a serious threat to the present medical system. Therefore, there is an urgency to develop advanced antimicrobial agents which can restrict the spread of pathogenic bacteria to eradicate infectious diseases. In this context, the current advancement in the field of nanotechnology would help us to develop nanomaterial-based antimicrobial agents which could be one of the possible alternatives of conventionally used antibiotics. There are numerous reports, which established that nanomaterials such as graphene oxide, carbon nanotube, noble metal nanoparticles, metal oxides like ZnO2, MnO2 etc. have possessed antibacterial activity. In particular, the use of nanosized molybdenum disulfide (MoS2), a transition metal dichalcogenide showed a great potential to utilize for the development of potent antibacterial agents owing to its unique chemical and photophysical properties. Two-dimensional MoS2 nanosheets provide a large surface to volume ratio for the effective interaction with the bacterial cell membrane. For better biological interactions of MoS2 nanomaterials, its surface modification can be easily achieved through functionalization using thiol ligand molecule. Functionalization also enhances its aqueous dispersibility in manyfold. In this thesis work, I have utilized MoS2 nanomaterials and their nanocomposites to develop nanomaterial-based effective antimicrobial agents for the pathogenic bacterial strains using multiple strategies. To extend my work towards the development of nanomaterial-based antibacterial agents, I have explored antibacterial activity of the supramolecularly self-assembled nanosized cage molecule to eradicate drug-resistant bacteria. Apart from antibacterial activity, I have also expanded the scope of applicability of our newly developed nanomaterials in the direction of bio-analyte detection and environmental remediation such as degradation of organic pollutant and detoxification of the chemical warfare agent.

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Частини книг з теми "MOLYBDENUM DISULFIDE NANOSHEETS"

Chen, Linxuan. "Molybdenum Disulfide Nanosheets for Efficient Hydrogen Evolution Reaction." In The 2021 International Conference on Machine Learning and Big Data Analytics for IoT Security and Privacy, 962–66. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-89511-2_135.

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Kumar, Praveen, and Amit Jaiswal. "2D Molybdenum Disulfide (MoS2 ) Nanosheets: An Emerging Antibacterial Agent." In Recent Trends and The Future of Antimicrobial Agents - Part 2, 172–89. BENTHAM SCIENCE PUBLISHERS, 2023. http://dx.doi.org/10.2174/9789815123975123010011.

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The development of resistance against antibiotics in microorganisms has led to the search for alternatives that can effectively kill microbes and will have a lesser probability of the generation of resistance. In this regard, nanomaterials have emerged as protagonists demonstrating efficient antibacterial activities against drug-resistant strains. Amongst nanomaterials, 2D nanosheets have attracted attention as an antibacterial agent due to their sheet-like features, having sharp edges and corners which can pierce through bacterial membranes, subsequently leading to membrane damage. The present chapter discusses the antibacterial potential of one such 2D material, transition metal dichalcogenides, specifically MoS2 nanosheets and their composites. A brief discussion about the synthesis of MoS2 nanosheets is presented, and a detailed overview of its application as an antibacterial agent is illustrated. The mechanism of action of antibacterial activity of 2D MoS2 nanosheets is discussed, which shows that these nanosheets can cause bacterial cell death through membrane damage and depolarization, metabolic inactivation and generation of reactive oxygen species (ROS). Further, the photothermal property and the intrinsic peroxidase-like activity in certain conditions can also show antibacterial activity, which is summarized in the chapter along with the biocompatibility evaluation.

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Rajendran, Sasireka, Vinoth Rathinam, Vasanth Kumar, Manusree Kandasamy, Sharmila Selvi Muthuvel, and Shanmugasundari Arumugam. "Biomedical Applications of Chitosan-Coated Nanosheets." In Advances in Nanosheets [Working Title]. IntechOpen, 2023. http://dx.doi.org/10.5772/intechopen.1002023.

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Nanotechnology paves the way for the synthesis of novel nanomaterials in one or more dimensions with a size range of less than 100 nm and enhances its specific application because of its unique properties. Nanosheets are a type of layered nanomaterial mostly designed using graphene, poly(L-lactic acid) (PLLA), and molybdenum disulfide by liquid exfoliation method and are of great interest. Nanosheets fabricated could be employed with other materials to enhance their application in diverse areas. Chitosan, a cationic polymer in conjugation with various nanosheets, was designed for various applications like sensors, cancer treatment, drug delivery, and so on. Chitosan-decorated different nanosheets were formulated by various methods, and their diverse application will be focused.

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Тези доповідей конференцій з теми "MOLYBDENUM DISULFIDE NANOSHEETS"

Qu, Ming, Tuo Liang, Jirui Hou, Weipeng Wu, Yuchen Wen, and Lixiao Xiao. "Ultralow Concentration of Amphiphilic Molybdenum Disulfide Nanosheets for Enhanced Oil Recovery-Research and Field Application." In SPE Annual Technical Conference and Exhibition. SPE, 2021. http://dx.doi.org/10.2118/206260-ms.

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Abstract Recently, spherical nanoparticles have been studied to enhance oil recovery (EOR) worldwide due to their remarkable properties. However, there is a lack of studies of nanosheets on EOR. In this work, we synthesize the amphiphilic molybdenum disulfide nanosheets through a straightforward hydrothermal method. The octadecyl amine (ODA) molecules were grafted onto the surfaces of molybdenum disulfide nanosheets due to the presence of active sites over the surfaces of MoS2 nanosheets. The synthesized amphiphilic molybdenum disulfide nanosheets (ODA-MoS2 nanosheets) are approximate 67 nm in width and 1.4 nm in thickness. The effects of ultralow concentration ODA-MoS2 nanosheets on the dynamic wettability change of solid surfaces and emulsion stability were also studied and discussed. Besides, the core flooding experiments were also conducted to reveal the adsorption rules and the oil displacement effects of ultralow concentration ODA-MoS2 nanosheets. Experimental results indicate that the oil-wet solid surface (a contact angle of 130°) can transform into the neutral-wet solid surface (a contact angle of 90°) within 120 hrs after 50 mg/L ODA-MoS2 nanosheets treatment. In addition, micro-scale emulsions in size of 2 µm can be formed after the addition of ODA-MoS2 nanosheets by adsorbing onto the oil-water interfaces. The desorption energy of a single ODA-MoS2 nanosheet from the oil-water interface to the bulk phase is proposed. When the concentration of ODA-MoS2 nanosheets is 50 mg/L, the emulsions are the most stable. Core flooding results demonstrate that the ultimate residue of ODA-MoS2 nanosheets in porous media is less than 11%, and the highest increased oil recovery of around 16.26% is achieved. Finally, the production performance of ultralow concentration of ODA-MoS2 nanofluid (50 mg/L) in the application of Daqing Oilfield is summarized and discussed.

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Wu, Guodong, Yanchi Liu, Maieryemuguli Anwaier, Erdong Yao, Hongda Ren, and Yuan Li. "Small Sizes of Molybdenum Disulfide Nanosheets As Heavy Oil Viscosity Reducers." In ASME 2022 41st International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2022. http://dx.doi.org/10.1115/omae2022-78776.

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Abstract The high content of asphaltenes and colloids in heavy oil lead to their high viscosity, making it difficult to exploit and transport. Nanomaterials have become an important additive in reducing viscosity of crude oil. In this work, a series of amphiphilic molybdenum dioxide (MoS2) nanosheets are developed to reduce the viscosity of crude oil by an ultralow concentration aqueous solution. Firstly, nanosheets were synthesized by the hydrothermal methods. The influence factors such as raw material ratio, temperature and time were investigated. Then, SEM are used to systemically characterize the morphology and structure of MoS2 nanosheets. Then, the properties (i.e., size, viscosity reduction, and interfacial activity) of MoS2 nanosheets are tested. The relationship between these properties and viscosity reduction abilities were studied. Finally, based on viscosity reduction testing results, optimal MoS2 nanosheets formulation and dosage are determined. By controlling the stirring and temperature, hydrophilic MoS2 nanosheets with sizes from 40 nm to 160 nm were synthesized, respectively. Modifying them with oleyl amine, the amphiphilic nanosheets can be obtained. SEM show that they are materials with layered nano-structure and commonly composed of 8–10 layers. These nanosheets have good interfacial activity, wetting and emulsifying ability. By adding 100 ppm of MoS2 nanosheets to the mixture of heavy oil and water, the viscosity of these system can fall from > 880 mPa·s to 9 mPa·s. The smaller the size of the MoS2 nanosheets is, the better the viscosity reduction ability will be. The optimal using dosage of these nanosheets is 300–400 ppm, and the optimal size is 40–60 nm. It is predicted that nanosheets will gradually become a new field for the development of heavy oil.

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Li, Yuan, Fujian Zhou, Bojun Li, Hang Xu, Erdong Yao, Minghui Li, and Lufeng Zhang. "Enhancement of Tight Oil Recovery by Amphiphilic Janus Nanosheets." In ASME 2022 41st International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2022. http://dx.doi.org/10.1115/omae2022-79920.

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Abstract Recently, nanofluid flooding has become one of the promising technologies in enhanced oil recovery. The agglomeration and the insufficient interfacial activity of nanoparticles in an aqueous solution are two major concerns affecting the application effect of nanofluids. Amphiphilic Janus nanomaterials make up for the deficiencies in both aspects compared with homogeneous modified nanomaterials. In this work, we investigate the potential use of an amphiphilic Janus molybdenum disulfide (MoS2) nanosheet (JMDN) as an enhanced oil recovery agent. JMDN was synthesized by the SiO2 Template Method. Firstly, molybdenum disulfide nanosheets were adsorbed on the surface of SiO2 nano-microspheres as a single-sided modification. Then KOH was used to dissolve the SiO2 nano-microspheres, and the other side of the nano-sheet was modified to obtain JMDN. The scanning electron microscope (SEM) and transmission electron microscope (TEM) were used to systematically characterize the morphology and structure of molybdenum disulfide nanosheets. The properties such as wettability, stability and interfacial tension were tested. The effect of using JMDN on low-permeability reservoir recovery was emphasized. Low-permeability core flooding and microfluidic experiments were conducted with a concentration of 50ppm nanofluids. The JMDN with 40nm particle size was synthesized under certain conditions. The results of SEM showed it has 5–6 layers of nanostructures and TEM indicates that hydrophilic carboxyl group and hydrophobic alkyl group respectively exist in two sides of the nanosheet. The modified nanosheet can be stable for 7 days at 90°C. The contact angle experiment shows that the JMDN could effectively change rocks from oil-wet to water-wet. Oil-water interfacial tension is as low as 2.87 mN/m. The core flooding experiment show that the nanofluid could significantly increase oil recovery. Numerous studies focused on the uniform modification of nanomaterials in tight oil recovery. Compared with conventional nanomaterials, the JMDN could strip oil from rock surfaces more efficiently due to its amphiphilic structure. This paper reveals the physical and chemical properties of JMDN and provides a new and efficient nanofluid system for EOR.

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Bai, Yuting, Yinping Miao, Mingxin Liu, Hongmin Zhang, Bin Li, Xiaoping Yang, and Jianquan Yao. "Relative Humidity Sensor Based on Molybdenum Disulfide Nanosheets Modified Microfiber Coupler." In 2018 Asia Communications and Photonics Conference (ACP). IEEE, 2018. http://dx.doi.org/10.1109/acp.2018.8595723.

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Zhang, Kaiyu, Jirui Hou, and Zhuojing Li. "Improved Gelation Performance of an Acidic Low-Polymer Loading Zirconium Cross-Linked CMHPG Fracturing Fluid by Surface Functionalized 1T-Phase Molybdenum Disulfide Nanosheets." In SPE International Conference on Oilfield Chemistry. SPE, 2021. http://dx.doi.org/10.2118/204308-ms.

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Abstract The low and ultra-low permeability reservoirs in China, such as the Changqing, Jidong, and Daqing peripheral oil fields, often apply CO2 as a flooding medium to enhance oil recovery. A serial of water-rock interactions will be occurred among the CO2, formation rock, and formation water under the HT/HP conditions. The pH value of the formation will be converted to acidity accordingly. As a side effect, the traditional guar-based fracturing fluids in an alkaline range, such as the borate cross-linked hydroxypropyl guar gum (HPG), cannot result in an effective hydrofracturing operation due to the incompatibility. Consequently, developing an acidic fracturing fluid system with a satisfactory performance is an imperative. Acidic fracturing fluids, such as the zirconium cross-linked carboxymethyl hydroxypropyl guar gum (CMHPG), can protect the formation during the hydrofracturing process from the damage arising from the swelling and migration of the clay particles. However, the shortcomings of the uncontrollable viscosity growth and the irreversible shear-thinning behavior limit the large-scale use of the acidic fracturing fluids. In this work, a novel organic zirconium cross-linker synthesized in the laboratory was applied to control and delay the cross-link reaction under the acidic condition. The ligands coordinated to the zirconium center were the L-lactate and ethylene glycol. The thickener used was the CMHPG at a low loading of 0.3% (approximately 25 pptg). Meanwhile, the surface functionalized metallic phase (1T-phase) molybdenum disulfide (MoS2) nanosheets were employed to improve the rheological performance of the zirconium cross-linked CMHPG fracturing fluid. The modification reagent utilized was the L-cysteine. The morphology, structure, and property of the fabricated functionalized 1T-MoS2 (Cys-1T-MoS2) nanosheets were systematically characterized using the transmission electron microscopy (TEM), scanning electron microscopy (SEM), Raman spectroscopy, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FTIR), and thermogravimetric analysis (TGA) measurements. The results of the characterization tests demonstrated a successful functionalization of the 1T-MoS2 nanosheets with L-cysteine. Then, the effects of this new nanosheet-enhanced zirconium cross-linked CMHPG fracturing fluid systems with different cross-linker and nanosheet loadings on gelation performance were systematically assessed employing the Sydansk bottle testing method combined with a rheometer under the controlled-stress or controlled-rate modes. The results indicated that the nanosheet-enhanced fracturing fluid had a desirable delayed property. Compared with the blank fracturing fluid (without nanosheets), the nanosheet-enhanced fracturing fluid had a much better shear-tolerant and shear-recovery performance.

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Amer, Moh, Frank DelRio, Fadhel Alsaffar, and Abdullah Alrasheed. "Laser treated molybdenum disulfide nanosheets: towards engineering better 2D photodetectors (Conference Presentation)." In Low-Dimensional Materials and Devices 2017, edited by Nobuhiko P. Kobayashi, A. Alec Talin, Albert V. Davydov, and M. Saif Islam. SPIE, 2017. http://dx.doi.org/10.1117/12.2274582.

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Basu, Parbati, Arnab Pal, Pijush K. Gan, and Kuntal Chatterjee. "N,P-dual doped molybdenum disulfide nanosheets for enhanced electrocatalytic hydrogen evolution reaction." In DAE SOLID STATE PHYSICS SYMPOSIUM 2019. AIP Publishing, 2020. http://dx.doi.org/10.1063/5.0016668.

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Qu, M. "Mechanisms of Nanofluid Based Modification MoS2 Nanosheet for Enhanced Oil Recovery." In Indonesian Petroleum Association 44th Annual Convention and Exhibition. Indonesian Petroleum Association, 2021. http://dx.doi.org/10.29118/ipa21-e-162.

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Recently, much attention has been directed towards the applications of nanofluids for enhanced oil recovery (EOR). Here, amphiphilic molybdenum disulfide (KH550-MoS2) nanosheets were synthesized using a hydrothermal approach. The physicochemical properties and potential EOR of ultra-low concentration KH550-MoS2 nanofluids were systematically investigated under reservoir conditions at Changqing Oilfield (China) (temperature~55℃ and salinity~7.8×104 mg/L). Interfacial tension (IFT), wettability change, and emulsion stability were measured to evaluate the physicochemical properties of the KH550-MoS2 nanofluids. The results showed that ultra-low concentration of KH550-MoS2 nanofluid (50 mg/L) could decrease IFT to 2.6 mN/m, change the contact angle (CTA) from 131.2° to 51.7° and significantly enhance emulsion stability. Core flooding experiments were conducted to determine the dynamic adsorption loss law and the oil displacement efficiency of KH550-MoS2 nanofluid. The results indicated that the ratio of cumulative produced KH550-MoS2 nanosheets to the total injected KH550-MoS2 nanosheets (CNR) reached 91.5% during flooding in low permeability reservoirs. Moreover, ultra-low concentration KH550-MoS2 nanofluid can increase the oil displacement efficiency by 14% after water driven. This study shows the physicochemical properties of the KH550-MoS2 amphiphilic nanofluid and offers a novel high- efficiency amphiphilic nanoﬂuid for EOR

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Zhao, L., M. Cheng, G. Liu, H. Lu, Y. Gao, and G. Lu. "BS6.4 - A fluorescent biosensor based on molybdenum disulfide (MoS2) nanosheets and protein aptamer for sensitive detection of carcinoembryonic antigen." In 17th International Meeting on Chemical Sensors - IMCS 2018. AMA Service GmbH, Von-Münchhausen-Str. 49, 31515 Wunstorf, Germany, 2018. http://dx.doi.org/10.5162/imcs2018/bs6.4.

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Cao, Dongqing, Ming Han, Mohanad M. Fahmi, and Abdulkareem M. AlSofi. "Improved AMD Nanosheet System to Increase Oil Production Under Harsh Reservoir Conditions." In Middle East Oil, Gas and Geosciences Show. SPE, 2023. http://dx.doi.org/10.2118/213888-ms.

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Abstract Amphiphilic molybdenum disulfide (AMD) nanosheet is a novel flake type Nano material, which is different from the widely used particulate Nano material, for increasing oil production. Most of the current researches and applications of nanosheets were for low temperature and low permeability sandstone reservoirs. This work investigated an improved nanosheet system for permeable carbonates at harsh reservoir conditions. AMD nanosheet sample was a concentrated black liquid with flake size about 80*60*1.2 nm. The features in a high salinity water (HSW) and high temperature were characterized by compatibility test, interfacial tension (IFT) test, emulsification test, and phase behavior test. The potential for increasing oil production was evaluated by micromodel displacement tests. The micromodel was treated to oil-wet to simulate the wettability of carbonates. The performances of initial sample and improved sample by a cationic surfactant were compared. Initial AMD nanosheet sample was not compatible with HSW at 95 °C. A cationic surfactant significantly improve the compatibility. IFT of 50 mg/L nanosheet with a light oil was 0.46 mN/m at 25 °C. IFT of The improved system with the surfactant decreased to 0.21 mN/m at 90 °C. The increase of nanosheet and surfactant concentration resulted in an IFT increase. Although IFT was not ultra-low, nanosheet had strong interfacial activity on oil-water interface even at low concentration. Nanosheet-only produced much stable emulsion than surfactant-only. Mixing nanosheet and surfactant increased emulsion stability slightly. Phase behavior results demonstrated that surfactant improved the hydrophilic and lipophilic balance of nanosheet to produce Winsor III type microemulsion. In core flow testing, the nanosheet alone injection partially plugged the core plug with relatively high adsorption/retention. Adding the surfactant improved the migration and reduced adsorption of nanosheet in porous media. Micromodel displacement test showed that improved nanosheet system at low concentration of 50 mg/L increased oil production by more than 20% after water flooding at both ambient temperature and reservoir temperature at 95 °C. This study investigated a more efficient material with same dimension as oil-water interface compared with surfactant or particulate Nano materials. An improved nanosheet system was developed for carbonate reservoirs under harsh conditions.

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