{"title":"Lateral growth of WSe2 monolayer film in a confined reaction environment via an Au vapor-assisted CVD: A systematic and comparative study with a NaCl-assisted CVD","authors":"Muhammet Ayhan Işık , Kardelen Çelik , Mehtap Aygün Çağlar , Güven Turgut","doi":"10.1016/j.flatc.2024.100796","DOIUrl":"10.1016/j.flatc.2024.100796","url":null,"abstract":"<div><div>Two-dimensional (2D) monolayer tungsten diselenide (WSe<sub>2</sub>) is of great interest in optoelectronic and photo(electro)catalytic applications due to its direct optical band gap characteristic which is highly dependent on the number of layers. Achieving uniform, high-purity, large-area monolayer WSe<sub>2</sub> with the traditional salt-assisted chemical vapor deposition method (CVD) remains challenging due to the issues controlling the growth mechanisms and number of layers. Recent studies have demonstrated that metal vapor-assisted CVD can achieve uniform development of large-scale WSe<sub>2</sub> monolayers. It is critical to comprehensively examine the influence of metal vapor-assisted CVD parameters on lateral WSe<sub>2</sub> growth relative to salt-assisted CVD and to analyze the underlying mechanisms. Here, we carried out a systematic and comparable study assessing the effect of several CVD parameters on lateral WSe<sub>2</sub> monolayer growth in the presence of a NaCl and an Au vapor catalyst, respectively. Detailed characterization of the grown WSe<sub>2</sub> materials confirmed that using only a gold vapor catalyst in a confined micro-reactor space of sapphires allows for the ultrafast growth of highly crystalline, uniform, and sub-centimeter-sized monolayer WSe<sub>2</sub> films without any residual ions, which can be scalable for reliable high-performance device fabrication and photocatalytic applications. Moreover, we observed that in-situ etching could occur on the film by the increased reaction time. Overall, this study paves the way for future research on fabricating large-area monolayer transition metal dichalcogenides and reaction mechanisms using gold or other metal vapor-assisted CVD in a confined reaction environment.</div></div>","PeriodicalId":316,"journal":{"name":"FlatChem","volume":"49 ","pages":"Article 100796"},"PeriodicalIF":5.9,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143182862","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
FlatChemPub Date : 2025-01-01DOI: 10.1016/j.flatc.2024.100779
Q.H. Liu , H.L. Shi , Q.Z. Han , J. Yang , Y.H. Ren , Y.H. Zhao , L.J. Gong , H. Yang , Z.T. Jiang
{"title":"Improving the thermoelectric performance of the SnS monolayer by Na doping: A theoretical study","authors":"Q.H. Liu , H.L. Shi , Q.Z. Han , J. Yang , Y.H. Ren , Y.H. Zhao , L.J. Gong , H. Yang , Z.T. Jiang","doi":"10.1016/j.flatc.2024.100779","DOIUrl":"10.1016/j.flatc.2024.100779","url":null,"abstract":"<div><div>Aiming at exploring new thermoelectric (TE) materials of high performance, we theoretically calculate the TE transport properties including the Seebeck coefficient, electrical conductance, thermal conductance, power factor, and figure of merit <span><math><mrow><mi>Z</mi><mi>T</mi></mrow></math></span> of the SnS monolayer. Different from the heavy-metal doping, the economical and environment-friendly Na doping is adopted to improve the <span><math><mrow><mi>Z</mi><mi>T</mi></mrow></math></span> of the monolayer SnS. It is shown that the Na doping can increase the maximum <span><math><mrow><mi>Z</mi><mi>T</mi></mrow></math></span> along the armchair and zigzag directions, respectively, and the highest <span><math><mrow><mi>Z</mi><mi>T</mi></mrow></math></span> peak is moved to the proximity of chemical potential <span><math><mrow><mi>μ</mi><mo>=</mo><mn>0</mn><mspace></mspace><mi>eV</mi></mrow></math></span>, which indicates that the corresponding TE device can work at a low bias voltage. As the temperature increases from 300 K to 800 K, the maximum <span><math><mrow><mi>Z</mi><mi>T</mi></mrow></math></span> of the pristine SnS monolayer is increased from 0.89 to 2.26 (from 1.33 to 2.89) along the armchair (zigzag) direction, and the maximum <span><math><mrow><mi>Z</mi><mi>T</mi></mrow></math></span> of the Na-doped one is increased from 1.24 to 2.45 (from 1.44 to 2.86) along the armchair (zigzag) direction. This implies that the Na-doped SnS monolayer can be utilized to design promising TE devices working in a broad temperature scope and at a lower bias voltage.</div></div>","PeriodicalId":316,"journal":{"name":"FlatChem","volume":"49 ","pages":"Article 100779"},"PeriodicalIF":5.9,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143182942","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
FlatChemPub Date : 2025-01-01DOI: 10.1016/j.flatc.2024.100800
Ayse V. Hacinecipoglu, Metin Gencten
{"title":"Efficient electrochemical synthesis of 2H-MoS2/S-Doped graphene oxide composites for Binder-Free High-Performance supercapacitor electrodes","authors":"Ayse V. Hacinecipoglu, Metin Gencten","doi":"10.1016/j.flatc.2024.100800","DOIUrl":"10.1016/j.flatc.2024.100800","url":null,"abstract":"<div><div>The objective of this research is to examine the synthesis and characterization of molybdenum disulfide (MoS<sub>2</sub>) and sulphur-doped graphene oxide (S-GO) composites as potential materials for advanced supercapacitors. The study reports the first use of 2H-MoS<sub>2</sub>@SG-based materials, synthesized via an electrochemical method at room temperature, as binder-free electrode materials in supercapacitors. The synthesis of 2H-MoS<sub>2</sub> involved cyclic voltammetry (CV), while sulfur-doped graphene oxide (SGO) was synthesized using chronoamperometry (CA). The materials were comprehensively characterized using various techniques, including Raman spectroscopy, X-ray photoelectron spectroscopy, and X-ray diffraction (XRD), to gain insights into their chemical structure. The surface morphology of the composites was examined using scanning electron microscopy (SEM) coupled with energy-dispersive X-ray spectroscopy (EDX). Additionally, the capacitive behavior changes over numerous cycles were evaluated through cyclic voltammetry, electrochemical impedance spectroscopy, and cyclic charge/discharge tests. The highest specific capacitance achieved was 532.8 mF cm<sup>−2</sup> at 10 mA cm<sup>−2</sup> (266.4F/g at 0.5 A g<sup>−1</sup> current density) with the 2H-MoS<sub>2</sub>@SG electrode and 247.4 mF cm<sup>−2</sup> at 10 mA cm<sup>−2</sup> (190.31F/g at 0.5 A g<sup>−1</sup> current density) with the SG10 electrode. These values were measured at charge–discharge current rates of 10 mAcm<sup>−2</sup> in a 1.0 M H<sub>2</sub>SO<sub>4</sub> electrolyte. Moreover, the capacitive behavior of this electrode was tested over 5000 cycles, showing a capacitance retention of more than 99.2 % at the end of the 5000 cycles. 2H-MoS<sub>2</sub>@SG electrodes shows a high coulombic efficiency of 100 % over 5000 cycles at 0.5 A g<sup>−1</sup>.</div></div>","PeriodicalId":316,"journal":{"name":"FlatChem","volume":"49 ","pages":"Article 100800"},"PeriodicalIF":5.9,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143182918","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"A full carbon-based thermoplastic photocatalyst for organic pollutants abatement: An experimental and computational study","authors":"Lidia Mezzina , Angelo Nicosia , Vincenzo Patamia , Antonio Rescifina , Luisa D’Urso , Vincenzo Paratore , Placido Giuseppe Mineo","doi":"10.1016/j.flatc.2025.100809","DOIUrl":"10.1016/j.flatc.2025.100809","url":null,"abstract":"<div><div>Remediating water pollution utilizing inorganic semiconductor photocatalysts represents the prevailing standard for sustainable depollution. However, the applicability of this method is impeded in underground environments, low Earth orbit outposts, and future lunar bases due to the scarcity of essential materials and the logistical challenges associated with supply provision. Within this framework, developing photocatalytic systems utilizing on-site accessible resources or repurposing plastic or bio-waste materials is deemed more advantageous. In particular, a hybrid fully carbon-based material incorporating a bio-derived chromophore may leverage the electronic interactions between the carbon moiety and the chromophore antenna to induce photocatalytic processes. In the present study, a porphyrin-reduced graphene oxide photocatalytic system was developed through a one-pot synthesis method, allowing the simultaneous covalent attachment of 5,10,15,20-tetrakis-(<em>p</em>-hydroxyphenyl)-porphyrin to the graphene oxide platform while concurrently reducing the latter. To prevent the dispersion and self-aggregation of the powder during water depollution treatments, the carbon-based photocatalyst was further integrated into polyvinyl acetate using an <em>in-situ</em> polymerization approach, producing various nanocomposites with different weight percentages of photocatalyst loads. The obtained products were characterized by infrared, Raman, absorption and fluorescence spectroscopies, electrochemical analysis, and thermogravimetric analysis. Photocatalytic tests, performed with both solar simulating and visible light (>400 nm), showed that the nanocomposites could act efficiently as sequestering agents and photocatalysts for organic pollutants. Finally, computational studies were performed to verify the spectroscopic features of the system and elucidate its photocatalytic mechanism. These studies demonstrated that the constructed photocatalytic system induced a planarization of the porphyrin structure, significantly enhancing its photocatalytic performance by increased light absorption, more efficient charge separation, and greater structural stability, collectively contributing to more robust and efficient catalytic cycles in the observed photocatalytic process.</div></div>","PeriodicalId":316,"journal":{"name":"FlatChem","volume":"49 ","pages":"Article 100809"},"PeriodicalIF":5.9,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143182863","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
FlatChemPub Date : 2025-01-01DOI: 10.1016/j.flatc.2024.100774
Xiaoming Yu, Yichun Cai, Tianfu Wang, Tongwen Yu
{"title":"A review on two-dimensional nanosheet membranes for separation","authors":"Xiaoming Yu, Yichun Cai, Tianfu Wang, Tongwen Yu","doi":"10.1016/j.flatc.2024.100774","DOIUrl":"10.1016/j.flatc.2024.100774","url":null,"abstract":"<div><div>Two-dimensional building blocks with atomic thinness can be assembled into ultrathin separation membranes minimizing the transport resistance to maximize the permeation rate. Herein, this review focuses on the current states, challenges and perspectives of 2D nanosheet membranes. The nanosheet membranes, such as zeolite, metal–organic frameworks (MOFs), graphene and graphene oxide (GO), COFs-based and mixed matrix membranes (MMMs) as well as 2D confined membranes are first systematically introduced. Further, the recent advances of synthesis methods for 2D nanosheets and membranes are systematically reviewed. It concludes with the current challenges of membrane synthesis and performance, the perspectives are also provided.</div></div>","PeriodicalId":316,"journal":{"name":"FlatChem","volume":"49 ","pages":"Article 100774"},"PeriodicalIF":5.9,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143183020","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
FlatChemPub Date : 2025-01-01DOI: 10.1016/j.flatc.2024.100802
Devkumari Patel , Swati Jaiswal , Bhushashi Khuntey , Sanju Yadav , Ankita Rai , Vijai K Rai , Manorama Singh
{"title":"An electroactive nanocomposite based on g-C3N4 and bioinspired synthesized reduced graphene oxide grafted Ag nanoparticles for p-nitrophenol detection","authors":"Devkumari Patel , Swati Jaiswal , Bhushashi Khuntey , Sanju Yadav , Ankita Rai , Vijai K Rai , Manorama Singh","doi":"10.1016/j.flatc.2024.100802","DOIUrl":"10.1016/j.flatc.2024.100802","url":null,"abstract":"<div><div>We report the <em>p</em>-nitrophenol electrochemical sensor using a new nanocomposite composed of bioinspired synthesised ‘reduced graphene oxide grafted Ag nanoparticles and <em>g</em>-C<sub>3</sub>N<sub>4</sub> ‘(AgNPs-rGO)<sub>TL</sub>’. Here, it has been prepared by simultaneous reduction of AgNO<sub>3</sub> and graphene oxide (GO) in one pot using only a phytoextract <em>i. e. Ocimum sanctum</em> leaf extract as a ‘green reducer’. It is a straightforward, green and cost-effective approach. Further, it blends with graphitic carbon nitride to form a new nanocomposite (AgNPs-rGO)<sub>TL</sub>:<em>g</em>-C<sub>3</sub>N<sub>4</sub> for electrocatalytic sensing of toxic ‘<em>p</em>-nitrophenol’ in the aqueous medium at −0.62 V. The synthesized nanocomposite was well-characterized by FTIR, XPS, XRD, SEM with EDX and TEM. Phyto-synthesized (AgNPs-rGO)<sub>TL</sub> synergistically enhances the properties of <em>g</em>-C<sub>3</sub>N<sub>4</sub> such as surface coverage area and electron transportation. The newly fabricated sensor exhibited negligible influence of common interferences and performed well in a very wide linearity in two calibration ranges (0.015 μM–846 μM and 846 μM–8001 μM) and detection limit (15 nM). The real-world sample analysis was well performed.</div></div>","PeriodicalId":316,"journal":{"name":"FlatChem","volume":"49 ","pages":"Article 100802"},"PeriodicalIF":5.9,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143182866","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
FlatChemPub Date : 2025-01-01DOI: 10.1016/j.flatc.2024.100795
Cem Odaci , Muhammad Shaukat Khan , Tutku Beduk , Manoj Jose , Marta Kisielewska , Umut Aydemir , Ali Roshanghias
{"title":"The enhanced lifetime of printed GaS-based photodetectors with polymer encapsulation","authors":"Cem Odaci , Muhammad Shaukat Khan , Tutku Beduk , Manoj Jose , Marta Kisielewska , Umut Aydemir , Ali Roshanghias","doi":"10.1016/j.flatc.2024.100795","DOIUrl":"10.1016/j.flatc.2024.100795","url":null,"abstract":"<div><div>Exhibiting excellent absorption in the UV–visible wavelength range makes layered gallium sulfide (GaS) semiconductor material a promising candidate for use in electronics and optoelectronics applications. Recently, a fully printed GaS-based photodetector has been proposed and fabricated, rendering a low-cost fabrication process in flexible electronics. However, the degradation of the semiconductor layer due to environmental conditions causes reliability issues and shortens their lifetime. Thus, in this study, an attempt has been made to encapsulate printed GaS-based photodetector using different polymers to hinder the degradation. It is demonstrated that encapsulating the printed GaS-based photodetector by utilizing the polymer-capping method with styrene co-polymers, Polystyrene-block-polyisoprene-block-polystyrene, highly hydrogenated poly(styrene)-block-poly(butadiene), partially hydrogenated poly(styrene)-block-poly(butadiene), increases the performance of the photodetector. The efficiency of the GaS-based photodetector printed on flexible polyethylene terephthalate (PET) substrate has reached up to 123 % in responsivity in 6 weeks after the polymer coating. Also, the device figure of merit, the detectivity value of the printed photodetector, has increased more than three times after the polymer coating compared to its as-deposited state. Meanwhile, it is observed that the fall and rise times of the printed GaS photodetector have remained constant. Based on these results attained in this study, it can be claimed that the polymer coating provides high performance and long stability in the printed GaS-based photodetectors on flexible substrates, which will pave the way for the further implementations of III-VI group layered semiconductor materials in electronics and optoelectronics applications.</div></div>","PeriodicalId":316,"journal":{"name":"FlatChem","volume":"49 ","pages":"Article 100795"},"PeriodicalIF":5.9,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143182919","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
FlatChemPub Date : 2025-01-01DOI: 10.1016/j.flatc.2025.100811
Havva Nur Gurbuz , Kenan Can Tok , Mehmet Gumustas , Esra Maltas Cagil , Hasan Huseyin Ipekci , Aytekin Uzunoglu
{"title":"Development of flexible nicotine sensors by inkjet printing of heteroatom-doped 3D V2C MXene nanoflower/holey carbon nanotube-based inks","authors":"Havva Nur Gurbuz , Kenan Can Tok , Mehmet Gumustas , Esra Maltas Cagil , Hasan Huseyin Ipekci , Aytekin Uzunoglu","doi":"10.1016/j.flatc.2025.100811","DOIUrl":"10.1016/j.flatc.2025.100811","url":null,"abstract":"<div><div>Two-dimensional (2D) metal carbides, nitrides, and carbo nitrides (MXenes) are considered potent alternatives to carbon-based 2D materials for inkjet printing. On the other hand, the low oxidation resistance and vulnerability to restacking issues make developing novel MXene-based materials with 3D structures essential. Herein, we developed highly stable aqueous inks consisting of Nitrogen and Sulphur-codoped (V<sub>2</sub>C MXene nanoflower (Nf)/holey multiwalled carbon nanotube (h-MWCNT)) hybrids. The V<sub>2</sub>C MXene Nf architectures with an average particle size of 284.6 ± 78.8 nm were synthesized using a facile ultrasonic treatment followed by a freeze-drying process without any template. The 3D V<sub>2</sub>C MXene architectures were mixed with holey MWCNTs to enhance the oxidation stability of MXene. Furthermore, creating holes in the MWCNT structure enhanced the printability of the inks and boosted the electrochemical performance of the printed sensors significantly compared to pristine MWCNT-based hybrids. The inks were inkjet printed on flexible substrates to fabricate electrochemical sensors. The electrocatalytic activity of the printed sensors was assessed against nicotine. The results indicated that our novel printed sensor design performed much better than already reported sensors in terms of linear range (10–500 µM) and LOD (0.058 µM).</div></div>","PeriodicalId":316,"journal":{"name":"FlatChem","volume":"49 ","pages":"Article 100811"},"PeriodicalIF":5.9,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143182973","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
FlatChemPub Date : 2025-01-01DOI: 10.1016/j.flatc.2024.100801
Nallin Sharma , Chia-Hung Chi , Deepak Dabur , Andrew Chi-Chang Tsai , Hui-Fen Wu
{"title":"Cost-effective and selective determining <1 µm melamine microplastics via the photoelectrochemical properties of Ir-Cu non-hexagonal nanosheets","authors":"Nallin Sharma , Chia-Hung Chi , Deepak Dabur , Andrew Chi-Chang Tsai , Hui-Fen Wu","doi":"10.1016/j.flatc.2024.100801","DOIUrl":"10.1016/j.flatc.2024.100801","url":null,"abstract":"<div><div>The increasing health hazards of microplastics has raised an alarming scenario worldwide. Microplastic contaminants are present everywhere and causing unwanted interactions and hence termed as pollutants. Strict studies to explore the involvement of small-size microplastics are need of hour, and highly sensitive probes are required for identification. The present study explores highly sensitive identification of <1 µm melamine microplastic in water sources using non-hexagonal IrCu (NH-IC) nanosheets as a photoelectrochemical (PEC) agent. Synthesis of IrCu nanosheet is carried out via a non-hydrolytic sol–gel process, assisted with the probe-sonication method. The methodology is stringently developed to achieve high PEC response under UV illumination, the current density increases after UV-illumination. Selective identification of melamine was achieved in comparison with other similar-sized microplastics, and particulate count’s measurement showed a high linearity response. The particulate study shows a high linearity response after incubation with the NH-IC nanosheet. The calculated response after melamine microplastic incubation for 10 and 20 min is R<sup>2</sup> 0.9421, 0.9624 and the limit of detection is 0.034 ppm and 0.0028 ppm, respectively.</div></div>","PeriodicalId":316,"journal":{"name":"FlatChem","volume":"49 ","pages":"Article 100801"},"PeriodicalIF":5.9,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143182939","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"The role of delaminating agents on the structure, morphology, bonding and electrical properties of HF etched MXenes","authors":"Swati Singh, Saicharan Dharavath, Supriya Kodali, Raj Kishora Dash","doi":"10.1016/j.flatc.2024.100806","DOIUrl":"10.1016/j.flatc.2024.100806","url":null,"abstract":"<div><div>MXenes (2-dimensional metal carbides and carbonitrides) have gained significant attention as layered materials due to their unique combination of high electrical conductivity and hydrophilic nature. In this study, titanium carbide MXene (Ti<sub>3</sub>C<sub>2</sub>T<sub>x</sub>) nanosheets have been synthesized by etching the MAX phase (Ti<sub>3</sub>AlC<sub>2</sub>) using hydrofluoric acid (HF) and subsequently delaminated using three different reagents: Tetramethylammonium hydroxide (TMAOH), Dimethyl sulfoxide (DMSO) and Aqueous ammonia (aq. NH<sub>3</sub>). The impact of these delaminating agents on the structure, morphology and electrical properties of the resulting MXenes was thoroughly investigated to elucidate the underlying mechanisms. Experimental results reveal that TMAOH is more effective in achieving layer separation than DMSO and aqueous NH<sub>3</sub>. Field emission scanning electron microscopy (FESEM) images confirm superior delamination with TMAOH, resulting in thinner, more transparent sheets than those obtained with the other agents. Raman spectroscopy further confirms successful layer separation in samples delaminated with TMAOH and DMSO with various surface functional groups including –OH, –F, and =O present on all delaminated sheets indicating that functionalization occurs during delamination. The electrical conductivity measurements results reveal that the etched MAX phase (MX3) exhibits higher electrical conductivity than the delaminated samples of identical thickness, likely due to the Grotthuss mechanism of proton conductivity playing a dominant role.</div></div>","PeriodicalId":316,"journal":{"name":"FlatChem","volume":"49 ","pages":"Article 100806"},"PeriodicalIF":5.9,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143182974","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}