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Search for "graphene" in Full Text gives 521 result(s) in Beilstein Journal of Nanotechnology. Showing first 200.

Metal-organic framework-based nanomaterials for CO2 storage: A review

  • Ha Huu Do,
  • Iqra Rabani and
  • Hai Bang Truong

Beilstein J. Nanotechnol. 2023, 14, 964–970, doi:10.3762/bjnano.14.79

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  • dramatic growth of 3.46 mmol·g−1 in the amount of absorbed CO2 after the modification, ascribed to the improved pore space by MWCNTs. In another work, MOF/carbon-based composites were reported by Liu and coworkers [40]. The authors used graphene oxides as templates for growing Cu-MOF nanograins for gas
  • storage. A benefit of this strategy was that surface area was enhanced, resulting in a significant 30% increase in the amount of CO2 adsorbed for the optimal Cu-MOFs/GO composites. Likewise, Kumar et al. employed graphene-based materials to reinforce MOF structures for the improvement of CO2 uptake [41
  • ]. The authors used carboxylic acids to modify graphene nanolayers, and then performed in situ synthesis of different MOF-74 materials on the graphene matrix via a solvothermal method (Figure 5). Although the surface area of composites was only slightly increased compared to the initial materials, the
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Published 20 Sep 2023

Upscaling the urea method synthesis of CoAl layered double hydroxides

  • Camilo Jaramillo-Hernández,
  • Víctor Oestreicher,
  • Martín Mizrahi and
  • Gonzalo Abellán

Beilstein J. Nanotechnol. 2023, 14, 927–938, doi:10.3762/bjnano.14.76

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  • hydroxides; layered double hydroxide; layered materials; scale-up process; synthesis; two-dimensional materials; Introduction Since the discovery of graphene [1], research on two-dimensional (2D) materials has become one of the most relevant topics in physics, chemistry, and (nano)materials science [2][3][4
  • ]. These materials play a key role both from a fundamental point of view and regarding potential applications in electronic devices, drug delivery, and energy storage and conversion, to name a few [5][6][7][8]. Layered materials range from monoelementals (i.e., graphene, silicene, germanene, or pnictogens
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Published 11 Sep 2023

Ni, Co, Zn, and Cu metal-organic framework-based nanomaterials for electrochemical reduction of CO2: A review

  • Ha Huu Do and
  • Hai Bang Truong

Beilstein J. Nanotechnol. 2023, 14, 904–911, doi:10.3762/bjnano.14.74

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  • low conductivity of MOFs hampers electron transport, leading to sluggish electrochemical reaction kinetics. To alleviate this problem, highly conductive materials such as graphene, and carbon nanotubes were combined with MOFs to improve overall conductivity. Additionally, the usage of pristine MOFs as
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Published 31 Aug 2023

A wearable nanoscale heart sound sensor based on P(VDF-TrFE)/ZnO/GR and its application in cardiac disease detection

  • Yi Luo,
  • Jian Liu,
  • Jiachang Zhang,
  • Yu Xiao,
  • Ying Wu and
  • Zhidong Zhao

Beilstein J. Nanotechnol. 2023, 14, 819–833, doi:10.3762/bjnano.14.67

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  • University, Hangzhou 310018, China School of Cyberspace Security, Hangzhou DIANZI University, Hangzhou 310018, China 10.3762/bjnano.14.67 Abstract This paper describes a method for preparing flexible composite piezoelectric nanofilms of P(VDF-TrFE)/ZnO/graphene using a high-voltage electrospinning method
  • . Composition and β-phase content of the piezoelectric composite films were analyzed using X-ray diffraction. The morphology of the composite film fibers was observed through scanning electron microscopy. Finally, the P(VDF-TrFE)/ZnO/graphene composite film was encapsulated in a sandwich-structure heart sound
  • , respectively, 2.4 times and 1.6 times greater than those of pure P(VDF-TrFE) nanogenerators [14]. Subash et al. added ZnO nanoparticles and exfoliated graphene oxide to P(VDF-TrFE) to prepare a composite nanofilm with excellent touch sensitivity and high output energy. They also used the piezoelectric film for
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Published 31 Jul 2023

In situ magnesiothermic reduction synthesis of a Ge@C composite for high-performance lithium-ion batterie anodes

  • Ha Tran Huu,
  • Ngoc Phi Nguyen,
  • Vuong Hoang Ngo,
  • Huy Hoang Luc,
  • Minh Kha Le,
  • Minh Thu Nguyen,
  • My Loan Phung Le,
  • Hye Rim Kim,
  • In Young Kim,
  • Sung Jin Kim,
  • Van Man Tran and
  • Vien Vo

Beilstein J. Nanotechnol. 2023, 14, 751–761, doi:10.3762/bjnano.14.62

Graphical Abstract
  • of crystalline Ge suggest the development of a novel Ge–C bond, akin to what has been observed in earlier studies on Ge–Sn and Ge–graphene [49][50]. Upon closer inspection of the Raman spectra between 1200 and 1800 cm−1, it can be observed that the ID/IG intensity ratio increases from 0.79 for BC-800
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Published 26 Jun 2023

Control of morphology and crystallinity of CNTs in flame synthesis with one-dimensional reaction zone

  • Muhammad Hilmi Ibrahim,
  • Norikhwan Hamzah,
  • Mohd Zamri Mohd Yusop,
  • Ni Luh Wulan Septiani and
  • Mohd Fairus Mohd Yasin

Beilstein J. Nanotechnol. 2023, 14, 741–750, doi:10.3762/bjnano.14.61

Graphical Abstract
  • graphene sheets on the surface [18][19]. In flame synthesis, the rapid heating rate causes catalytic activation and nucleation to occur almost instantaneously by the arrangement of carbon atoms on the surface of catalyst nanoparticles, leading to cap formation and liftoff. Figure 2b and Figure 2d show
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Published 21 Jun 2023

A graphene quantum dots–glassy carbon electrode-based electrochemical sensor for monitoring malathion

  • Sanju Tanwar,
  • Aditi Sharma and
  • Dhirendra Mathur

Beilstein J. Nanotechnol. 2023, 14, 701–710, doi:10.3762/bjnano.14.56

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  • Sanju Tanwar Aditi Sharma Dhirendra Mathur Centre of Nanotechnology, Rajasthan Technical University, Kota, Rajasthan, India Materials Research Centre, Malaviya National Institute of Technology, Jaipur, Rajasthan, India 10.3762/bjnano.14.56 Abstract Graphene quantum dots (GQDs) were made via a
  • spectroscopy; electrochemical sensor; graphene quantum dots; malathion; Introduction Global population growth makes food production more challenging, and pesticides are therefore used in agriculture in greater quantities than in the past to maintain and increase crop yields [1][2]. Pesticides containing
  • use of graphene and its derivatives is widespread for electrochemical detection since 2D graphene sheets provide numerous electrochemical sites for the detection of target molecules, while electrons in the sp2-hybridized pz orbital have a faster electron transfer rate, which enhances response time and
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Published 09 Jun 2023

Transferability of interatomic potentials for silicene

  • Marcin Maździarz

Beilstein J. Nanotechnol. 2023, 14, 574–585, doi:10.3762/bjnano.14.48

Graphical Abstract
  • graphene has also sparked interest in other non-carbon 2D materials [1][2]. One of such materials is 2D silicon, called silicene [3][4]. Using first-principles methods with current computer resources enables us to model structures up to about a few hundred atoms. For larger systems, approximate methods are
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Published 08 May 2023

ZnO-decorated SiC@C hybrids with strong electromagnetic absorption

  • Liqun Duan,
  • Zhiqian Yang,
  • Yilu Xia,
  • Xiaoqing Dai,
  • Jian’an Wu and
  • Minqian Sun

Beilstein J. Nanotechnol. 2023, 14, 565–573, doi:10.3762/bjnano.14.47

Graphical Abstract
  • graphene) may be easier because of the abundance of oxygen functional groups (e.g., carboxyl or hydroxy groups) on the carbon surface [26][31][32], in comparison to pure SiC. The introduction of carbon may help to further adjust the electromagnetic parameters and performance of SiC@ZnO nanocomposites
  • could be well controlled by adjusting the fractions of pristine materials and filler load of the absorbers. A comprehensive comparison with materials from our previous works (SiC@C and SiC@C-Fe3O4) and other reported materials (such as ZnO-decorated SiCnw or graphene/SiC) [16][24][34][35] shows that the
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Published 04 May 2023

Carbon nanotube-cellulose ink for rapid solvent identification

  • Tiago Amarante,
  • Thiago H. R. Cunha,
  • Claudio Laudares,
  • Ana P. M. Barboza,
  • Ana Carolina dos Santos,
  • Cíntia L. Pereira,
  • Vinicius Ornelas,
  • Bernardo R. A. Neves,
  • André S. Ferlauto and
  • Rodrigo G. Lacerda

Beilstein J. Nanotechnol. 2023, 14, 535–543, doi:10.3762/bjnano.14.44

Graphical Abstract
  • of lightweight materials comprising a conductive ingredient (e.g., carbon nanotubes (CNTs), graphene, graphene oxide, and metal particles) embedded in a polymer matrix, have been extensively studied as liquid sensors [14][15][16][17][21][22]. The main idea is to combine the responsive electrical
  • has resurfaced recently as a smart material because of its excellent thermal-mechanical properties, biocompatibility, biodegradability, and flexibility [22][23][30][31]. Composites based on carbon nanotubes or graphene and cellulose have been reported for, among other things, humidity and vapor
  • [39][40]. Besides, graphene films deposited on cellulose paper and a graphene/cellulose composite were also reported as a solvent sensor material [30][33]. However, most of these works rely on cellulose as a paper substrate or as a thick composite film that cannot be readily employed for large-scale
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Published 26 Apr 2023

On the use of Raman spectroscopy to characterize mass-produced graphene nanoplatelets

  • Keith R. Paton,
  • Konstantinos Despotelis,
  • Naresh Kumar,
  • Piers Turner and
  • Andrew J. Pollard

Beilstein J. Nanotechnol. 2023, 14, 509–521, doi:10.3762/bjnano.14.42

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  • .14.42 Abstract Raman spectroscopy is one of the most common methods to characterize graphene-related 2D materials, providing information on a wide range of physical and chemical properties. Because of typical sample inhomogeneity, Raman spectra are acquired from several locations across a sample, and
  • analysis is carried out on the averaged spectrum from all locations. This is then used to characterize the “quality” of the graphene produced, in particular the level of exfoliation for top-down manufactured materials. However, these have generally been developed using samples prepared with careful
  • , although quantification of the amount remains approximate. We therefore recommend this approach as a robust methodology for reliable characterization of mass-produced graphene-related 2D materials using confocal Raman spectroscopy. Keywords: few-layer graphene; graphene; metrology; quality control; Raman
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Published 24 Apr 2023

Molecular nanoarchitectonics: unification of nanotechnology and molecular/materials science

  • Katsuhiko Ariga

Beilstein J. Nanotechnol. 2023, 14, 434–453, doi:10.3762/bjnano.14.35

Graphical Abstract
  • molecules was also realized. Kawai et al. synthesized three-dimensional graphene nanoribbons by surface chemistry and showed that local probe chemistry can be used to add different molecules by tip manipulation [115]. Specifically, they demonstrated that radicals created by tip-induced debromination can be
  • . Foster, Kawai, and co-workers have investigated the zero-bias peak at the center of an armchair-type graphene nanoribbon on a AuSix/Au(111) surface using a combination of low-temperature scanning tunneling microscopy/spectroscopy and density functional theory calculations [116]. The zero-bias peak at the
  • boron site embedded at the center of the graphene nanoribbon was investigated. Si atoms were removed by vertical manipulation with a tip (Figure 5). In this manipulation, the tip was positioned at a silicon site and then moved closer to the silicon atoms while recording the tunneling current. After the
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Published 03 Apr 2023

Evaluation of electrosynthesized reduced graphene oxide–Ni/Fe/Co-based (oxy)hydroxide catalysts towards the oxygen evolution reaction

  • Karolina Cysewska,
  • Marcin Łapiński,
  • Marcin Zając,
  • Jakub Karczewski,
  • Piotr Jasiński and
  • Sebastian Molin

Beilstein J. Nanotechnol. 2023, 14, 420–433, doi:10.3762/bjnano.14.34

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  • Cracow, Poland 10.3762/bjnano.14.34 Abstract In this work, the specific role of the addition of graphene oxide (GO) to state-of-the-art nickel–iron (NiFe) and cobalt–nickel–iron (CoNiFe) mixed oxides/hydroxides towards the oxygen evolution reaction (OER) is investigated. Morphology, structure, and OER
  • different kinds of conductive carbon materials [14][15][16][17][18]. Recently, graphene (Gr)/graphene oxide (GO) has attracted the attention of many researchers due to its high surface area, significant chemical stability, high electrical conductivity, and high mechanical strength [12][19]. Combining a
  • graphene material with Ni-, Fe- and/or Co-based oxides/hydroxides with high chemical reactivity provides both an effective electron pathway through the catalyst [20] and high specific surface area [21], which is desirable for the OER process [13]. The overall electrocatalytic performance of the hybrid
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Published 29 Mar 2023

Plasmonic nanotechnology for photothermal applications – an evaluation

  • A. R. Indhu,
  • L. Keerthana and
  • Gnanaprakash Dharmalingam

Beilstein J. Nanotechnol. 2023, 14, 380–419, doi:10.3762/bjnano.14.33

Graphical Abstract
  • cause little damage to adjacent healthy tissues due to extremely localized heating [3]. Generally, the reduction of material dimensions to the nanoscale, such as in graphene, carbon nanotubes (CNT) and polymers, leads to an enhancement of the PT effect due to factors such as improved thermal
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Published 27 Mar 2023

Bismuth-based nanostructured photocatalysts for the remediation of antibiotics and organic dyes

  • Akeem Adeyemi Oladipo and
  • Faisal Suleiman Mustafa

Beilstein J. Nanotechnol. 2023, 14, 291–321, doi:10.3762/bjnano.14.26

Graphical Abstract
  • . BiFeO3-graphene nanocomposites were made using a hydrothermal process by Lam and co-workers [177]. Under visible-light photocatalysis, the nanocomposite efficiently degraded Congo red dye. The improved performance was attributed to the altered bandgap between graphene oxide and BiFeO3. Table 9 provides a
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Published 03 Mar 2023

Cyclodextrins as eminent constituents in nanoarchitectonics for drug delivery systems

  • Makoto Komiyama

Beilstein J. Nanotechnol. 2023, 14, 218–232, doi:10.3762/bjnano.14.21

Graphical Abstract
  • , this method is less affected by drug resistance and side-effects. A hydrogel was prepared by using both the electrostatic self-assembly between graphene oxide and a quaternized polymer and the formation of a pseudopolyrotaxane between α-CyD and poly(ethylene glycol) monomethyl ether (many α-CyD
  • molecules were threaded into the polymer chains) [87]. NIR light (808 nm) was absorbed by graphene oxide and converted into heat for photothermal therapy. At the same time, the heat induces the gel–sol transition of the hydrogel to release the encapsulated drug which add to the photothermal effect for
  • temperature elevation by the photothermal effect induces gel–sol transition of the nanomedicine, which the release of encapsulated cisplatin from the hydrogel. Mitochondria-targeting photothermal therapy was accomplished by two-dimensional nanoassemblies, prepared from β-CyD-grafted graphene oxide and
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Published 09 Feb 2023

Structural, optical, and bioimaging characterization of carbon quantum dots solvothermally synthesized from o-phenylenediamine

  • Zoran M. Marković,
  • Milica D. Budimir,
  • Martin Danko,
  • Dušan D. Milivojević,
  • Pavel Kubat,
  • Danica Z. Zmejkoski,
  • Vladimir B. Pavlović,
  • Marija M. Mojsin,
  • Milena J. Stevanović and
  • Biljana M. Todorović Marković

Beilstein J. Nanotechnol. 2023, 14, 165–174, doi:10.3762/bjnano.14.17

Graphical Abstract
  • shows that the absorption of DPBF solution in both vials is nearly identical. This means that the CQDs/PU sample does not produce singlet oxygen, which confirms the previous results obtained by EPR and luminescence at 1270 nm. Ge et al. reported earlier that graphene quantum dots generate singlet oxygen
  • through energy transfer to molecular oxygen [21]. Chong et al. claimed that superoxide anions are involved in the generation of singlet oxygen, implying that electron transfer is an intermediate step for the generation of singlet oxygen by photoexcited graphene quantum dots [20]. In nitrogen-doped
  • graphene, depending on the doping procedure, the nitrogen moieties include graphitic N together with pyrrolic and pyridinic nitrogen and amino groups [37][38][39]. Bianco et al. reported recently that pyridine nitrogen can be a reactive center and activates other reactive centers at the adjacent carbon
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Published 30 Jan 2023

Liquid phase exfoliation of talc: effect of the medium on flake size and shape

  • Samuel M. Sousa,
  • Helane L. O. Morais,
  • Joyce C. C. Santos,
  • Ana Paula M. Barboza,
  • Bernardo R. A. Neves,
  • Elisângela S. Pinto and
  • Mariana C. Prado

Beilstein J. Nanotechnol. 2023, 14, 68–78, doi:10.3762/bjnano.14.8

Graphical Abstract
  • allows it to be employed to obtain nanoflakes of a collection of materials such as graphene [3][7], hexagonal boron nitride [8], transition metal dichalcogenides [9], and others [10][11]. Although the experimental setup is generally designed as described before [6], numerous parameters must be adjusted
  • pharmaceutical and cosmetics uses [17]. It was shown that monolayer talc has outstanding mechanical properties of the same order of magnitude as graphene [12]. The breaking strength for uniaxial deformations ranges from 29 to 33 N·m−1, and the two-dimensional elasticity modulus is E = 181 N·m−1. Also, talc’s
  • flexural rigidity is about three times that of graphene but it can be bent to small curvatures without fracturing. These properties make nanoscale talc a promising candidate for the application [14][15][18] as reinforcement for polymers and other composites, including biocompatible materials, and van der
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Published 09 Jan 2023

Atmospheric water harvesting using functionalized carbon nanocones

  • Fernanda R. Leivas and
  • Marcia C. Barbosa

Beilstein J. Nanotechnol. 2023, 14, 1–10, doi:10.3762/bjnano.14.1

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  • monolayers of graphene and MoS2 [43][44]. Another advantage of the cone format is the possibility of capturing more water at the larger diameter entrance, without losing the high flow at the reduced diameter in other parts of the cone. As the example of the Namibian desert beetle shows, the introduction of
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Published 02 Jan 2023

Single-step extraction of small-diameter single-walled carbon nanotubes in the presence of riboflavin

  • Polina M. Kalachikova,
  • Anastasia E. Goldt,
  • Eldar M. Khabushev,
  • Timofei V. Eremin,
  • Timofei S. Zatsepin,
  • Elena D. Obraztsova,
  • Konstantin V. Larionov,
  • Liubov Yu. Antipina,
  • Pavel B. Sorokin and
  • Albert G. Nasibulin

Beilstein J. Nanotechnol. 2022, 13, 1564–1571, doi:10.3762/bjnano.13.130

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  • isoalloxazine rings and a sidewall of SWCNTs [17][18]. Flavin derivatives compounds are known to extract specific (n,m) SWCNTs from dispersions in organic solvents [19][20]. Moreover, flavin mononucleotide phosphate could be used as a stabilizer for graphene aqueous dispersions [21]. Although proven to
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Published 22 Dec 2022

A TiO2@MWCNTs nanocomposite photoanode for solar-driven water splitting

  • Anh Quynh Huu Le,
  • Ngoc Nhu Thi Nguyen,
  • Hai Duy Tran,
  • Van-Huy Nguyen and
  • Le-Hai Tran

Beilstein J. Nanotechnol. 2022, 13, 1520–1530, doi:10.3762/bjnano.13.125

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  • 42.6° correspond to the d-spacing between graphene sheets and the lateral correlation of graphite layers, which is presentative for MWCNTs [27]. Additionally, the XRD pattern of TiO2 exhibits peaks at 25.4° and 48.2°, ascribed to the anatase phase, while the other peaks at 27.6° and 36.2° are
  • electrodes [38]. The results reveal a significant improvement in the electrical conductivity for the TiO2@MWCNTs electrode. The result agrees well with a previous study on TiO2@graphene composite electrodes [37]. Among the electrodes, the EDL capacitance (C2) at the TiO2 electrode surface is the lowest (1.32
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Published 14 Dec 2022

Rapid and sensitive detection of box turtles using an electrochemical DNA biosensor based on a gold/graphene nanocomposite

  • Abu Hashem,
  • M. A. Motalib Hossain,
  • Ab Rahman Marlinda,
  • Mohammad Al Mamun,
  • Khanom Simarani and
  • Mohd Rafie Johan

Beilstein J. Nanotechnol. 2022, 13, 1458–1472, doi:10.3762/bjnano.13.120

Graphical Abstract
  • probe using bioinformatics tools, and it was also validated in wet-lab experiments. As a detection platform, a screen-printed carbon electrode (SPCE) enhanced with a nanocomposite containing gold nanoparticles and graphene was used. The morphology of the nanoparticles was analysed by field-emission
  • the applications of impedance DNA hybridisation biosensors for the detection of a number of analytes [31][32][33][34]. Nanomaterials may significantly enhance biosensor performance, stability, repeatability, and sensitivity [35][36][37][38][39]. Among various nanomaterials, graphene (Gr) [40] and gold
  • nanoparticles (AuNPs) [32] based nanocomposites are well established [41] due to their excellent performance. In particular, self-decorated AuNPs in the honeycomb-structured graphene lattice could facilitate the accommodation of a greater number of recognition probes. In addition, Gr is a nanomaterial with a
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Published 06 Dec 2022

LED-light-activated photocatalytic performance of metal-free carbon-modified hexagonal boron nitride towards degradation of methylene blue and phenol

  • Nirmalendu S. Mishra and
  • Pichiah Saravanan

Beilstein J. Nanotechnol. 2022, 13, 1380–1392, doi:10.3762/bjnano.13.114

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  • shows zero activity in the visible region. Keywords: carbon modification; hexagonal boron nitride (HBN); LED light; phenol; photocatalysis; Introduction Hexagonal boron nitride (HBN) commonly known as white graphene belongs to a class of two-dimensional layered crystalline materials. It comprises
  • boron (B) and nitrogen (N) atoms in equal stoichiometry in a honeycomb-like arrangement comparable to that of graphene [1][2][3]. Its interlayer stacking consists of a sandwich-type arrangement of B and N atoms. The N atom is more electronegative than the B atom, leading to polarization and localization
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Published 22 Nov 2022

Recent trends in Bi-based nanomaterials: challenges, fabrication, enhancement techniques, and environmental applications

  • Vishal Dutta,
  • Ankush Chauhan,
  • Ritesh Verma,
  • C. Gopalkrishnan and
  • Van-Huy Nguyen

Beilstein J. Nanotechnol. 2022, 13, 1316–1336, doi:10.3762/bjnano.13.109

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  • -type Bi2O3 CB. In the Bi2O3/Bi2S3 photocatalytic system, electrons and holes participate directly in the redox process. In another reported work, a BiOI/Bi2O2CO3/graphene ternary composite was fabricated via a facile and economic hydrothermal technique [98]. In order to assess the newly constructed
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Published 11 Nov 2022

Studies of probe tip materials by atomic force microscopy: a review

  • Ke Xu and
  • Yuzhe Liu

Beilstein J. Nanotechnol. 2022, 13, 1256–1267, doi:10.3762/bjnano.13.104

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  • ][24]. Jiménez-Sánchez et al. [25] studied the extraction of Ir clusters from graphene (by indentation) on the surface of Rh(111) to fabricate AFM sharp nano-tips, i.e., with weak van der Waals interactions. Experiments were performed under ultrahigh pressure and low temperature (5 K) conditions using
  • average diameter of the tip generated under this method is 10 ± 5 nm. Transmission electron microscopy confirmed that this tip type is a multi-walled nanotube (MWNT) formed by ordered graphene walls. In any case, however, the pore growth method does not allow the growth of a single carbon nanotube at the
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Published 03 Nov 2022
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