MATERIALS RESEARCH BULLETIN
·
2024
·
IF 5.3
Zhiwen Shi,Lijuan Qiao,Zhi Jia,Peng Zhang,Bingxin Liu,Li Gao
It is of great significance to detect methanol in human exhaled breath since it may cause neurological disorders. In this study, N-doped Ti 3 C 2 T x MXene was synthesized by annealing and nitrogen doping in clay-like Ti 3 C 2 T x MXene. Then, TiO 2 nanospheres was generated in situ on the surface of N-doped Ti 3 C 2 T x MXene to provide adsorption and reaction sites for methanol. Based on the synergistic effects of electronic properties and gas adsorption, the N-Ti 3 C 2 T x MXene/TiO 2 exhibits high responsiveness and excellent selectivity to methanol at room temperature. Moreover, the detection limit is 0.1194 ppm. In addition, the adsorption and oxidation process of methanol on the N-Ti 3 C 2 T x MXene/TiO 2 was explored by in situ infrared spectra testing to reveal that the oxygen vacancy on the surface of N-Ti 3 C 2 T x MXene/TiO 2 plays an important role in the selective detection of methanol. This experiment provides a feasible solution for the detection of methanol gas in exhaled breath at room temperature.
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Nanomaterials
·
2023
·Vol. 13
·期 15
·2261
·
IF 5.3
Zelin Li,Yang Zhao,Qinglin Deng,Xuhui Zhu,Yipeng Tan,Ziwen Feng,Hao Ji,Shan Zhang,Lingmin Yao
Using natural light energy to convert water into hydrogen is of great significance to solving energy shortages and environmental pollution. Due to the rapid recombination of photogenerated carriers after separation, the efficiency of photocatalytic hydrogen production using photocatalysts is usually very low. Here, efficient CdZnS nanoparticles@Ti3C2TxMXene nanosheet heterojunction photocatalysts have been successfully prepared by a facile in situ growth strategy. Since the CdZnS nanoparticles uniformly covered the Ti3C2TxMxene nanosheets, the agglomeration phenomenon of CdZnS nanoparticles could be effectively inhibited, accompanied by increased Schottky barrier sites and an enhanced migration rate of photogenerated carriers. The utilization efficiency of light energy can be improved by inhibiting the recombination of photogenerated electron-hole pairs. As a result, under the visible-light-driven photocatalytic experiments, this composite achieved a high hydrogen evolution rate of 47.1 mmol h−1g−1, which is much higher than pristine CdZnS and Mxene. The boosted photocatalytic performances can be attributed to the formed heterojunction of CdZnS nanoparticles and Ti3C2TxMXene nanosheets, as well as the weakened agglomeration effects.
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Analytical Methods
·
2025
·
IF 2.6
Jinping Tang,Yuhai Wang,Chunxu Wang,Ziwei Yu,Jin Wang
Surface-enhanced Raman scattering (SERS) has emerged as a powerful analytical tool for trace molecular detection, enabling identification of target analytes through their characteristic vibrational fingerprints. Its high sensitivity, selectivity, and non-destructive detection capabilities make it extremely valuable in fields such as biological detection, food safety, and environmental detection. Currently, metal carbonitride (MXene) as an emerging two-dimensional material has become a hot topic in the field of SERS. In this work, by combining the advantages of bimetallic nanoparticles and MXene nanosheets, Ni/Ag nanoparticles with different proportions were modified on monolayer MXene nanosheets through chemical reduction and transmetallation reactions for the rapid detection of thiram. The evaluation of the SERS performance of the MXene–Ni/Ag composite substrate for the Raman reporter molecule mercaptobenzoic acid (MBA) demonstrates a high SERS performance factor (SPF) of 8.2 × 106, and a low detection limit of 10−10 M. Also, for the detection of the pesticide thiram, the substrate exhibits high sensitivity and reliable quantitative analysis capabilities, retaining detectable spectral features even at concentrations down to 10−9 M. Meanwhile, the substrate also exhibits a low relative standard deviation (RSD) value in reproducibility and maintains good stability over a certain period. Ni/Ag bimetallic nanoparticles provide high SERS activity, while MXene nanosheets effectively concentrate target molecules through their strong adsorption capacity. These results indicate that MXene–Ni/Ag composite substrates can serve as a highly effective SERS platform for sensitive and reliable environmental monitoring.
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CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Qiang Li,Tianhui Zhao,Junjie Zhu,Muyuan Ma,Guoqing Hou,Mengyuan Fang,Yu Shen,Xiaoli Zhao,Zhi Tang,Fengchang Wu
Acetaminophen (ACTP) is a widely used antipyretic and analgesic, especially after the COVID-19 pandemic, during which its extensive use led to widespread distribution in the environment. Conventional wastewater treatment methods struggle to fully degrade ACTP, posing potential risks to human health and ecosystems. Therefore, developing efficient, safe, environmentally friendly, and cost-effective techniques for ACTP degradation is imperative. Herein, ultrathin-single Ti 3 C 2 T X MXene (USM) and multilayered Ti 3 C 2 T X MXene (MLM) with nanometer thickness and micron transverse size were synthesized from the MAX via acid/salt (HCl + LiF) etching process. Time-resolved photoluminescence indicated that the average fluorescence lifetimes (τ ave ) of USM (96.870 ns) and MLM (53.839 ns) are 9.47 and 5.26 times that of MAX (10.229 ns), respectively. Both materials exhibited excellent ACTP degradation ability (∼100 %) in a photocatalytic Fenton-like reaction process under visible light within 60 min. The visible light enhanced the degradation of ACTP by accelerating the redox cycles of Ti 3+ /Ti 4+ and achieving continuous catalytic activation of H 2 O 2 to form reactive oxygen species (h + , •OH, •O 2 – , and 1 O 2 ). Among these, h + radicals were the primary contributors, with •OH, •O 2 – , and 1 O 2 also playing supportive roles in the degradation process. The ecological structure–activity relationships analysis indicated that the degradation intermediates had significantly lower toxicity than ACTP itself. This study offers valuable insights into MXene’s application in photocatalytic Fenton-like systems, paving the way for efficient pharmaceutical degradation.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Chunyan Zhang,Yu Liu,Yi Zhao,Yining Qu,Li Wang,Han Zhang,Daomei Chen,Jiaqiang Wang
Most photocatalysts reported to date require sacrificial agents to achieve high-efficiency photocatalytic production of H 2 O 2 . Developing photocatalysts for H 2 O 2 production without sacrificial agents remains a significant challenge. In this study, we proposed an interfacial Schottky junction consisting of InP quantum dots (QDs) and Ti 3 C 2 T x nanosheets for photocatalytic production of H 2 O 2 without relying on any sacrificial agents. The InP/Ti 3 C 2 T x photocatalyst demonstrated high efficiency in generating H 2 O 2 , even when tested in wastewater and tap water. The photocatalytic rate of 5InP/Ti 3 C 2 T x reached 21.31 mmol g⁻¹ h⁻¹, which is 112 times greater than InP QDs. The 5InP/Ti 3 C 2 T x catalyst achieved a degradation performance of 99.9% for acid orange 7. The photocatalytic production of H 2 O 2 was effectively utilized in actual wastewater to decrease chemical oxygen demand (COD) levels. The COD concentration was decreased to 67 mg L −1 , well below the permissible threshold set by China's Ministry of Ecology and Environment for coking chemical industry emissions. As far as we know, no prior study has documented the application of InP in the photocatalytic production of H 2 O 2 within actual wastewater. This research explores the applications and impacts of InP compounds in the field of photocatalysis. This work introduces a novel approach for sacrificial agent-free photocatalytic H 2 O 2 production, offering a significant advancement in the field.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Ziheng Ye,Feihua Liu,Xiaoai Ye,Kaizheng Gao,Jingjing Luo,Xiangli Liu,Weiwei Zhao
Ti 3 C 2 T x MXene with outstanding physicochemical properties have shown huge potential in electromagnetic interference (EMI) shielding applications. However, the poor chemical stability and mechanical fragility have seriously hindered their practical use. Herein, we developed a novel pyrimidine-containing polyimide (PPI) and constructed Ti 3 C 2 T x /PPI (MP) composite films . The incorporation of PPI not only suppresses the oxidation of Ti 3 C 2 T x by forming Ti-N x interactions between the nitrogen-rich pyrimidine rings of PPI and the Ti centers of Ti 3 C 2 T x , but also enhances mechanical strength and durability of the composite film across a wide temperature range (-196–250 ℃). Compared with Ti 3 C 2 T x film, the MP film exhibits significantly improved oxidation resistance , which the EMI SE of MP film did not decrease after 14 days in 80 ℃/80 RH environment when the weight ratio of Ti 3 C 2 T x and PPI reaches 11:4. Merely 1.4 dB decrease in EMI SE of the MP film was revealed after 200,000 bending cycles with a radius of 2 mm, and the EMI SE remained virtually unchanged after bending in liquid N 2 . Moreover, the composite film demonstrates excellent thermal management properties, including rapid thermal response, efficient electrothermal conversion, excellent durability and stability. The combination of desirable EMI shielding ability, ultrahigh flexibility, superior stability and durability, as well as ideal thermal management performance gives this material excellent potential for various applications.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2025
·
IF 7.7
Meiling Lian,Haoquan Wang,Liuxing Chen,Da Chen,Qi Yang,Xuezhi Qiao
Electrochemical sensing devices often suffer from biofouling due to nonspecific adsorption of biomolecules and microorganisms in complex biological matrices. To address this challenge, we developed an efficient antifouling and self-sterilizing sensing interface by grafting polyethylene glycol (PEG) onto two-dimensional Ti 3 C 2 T x MXene nanosheets for the accurate detection of cardiac troponin I (cTnI), a gold-standard biomarker for acute myocardial infarction (AMI). The Mn 2+ -intercalated Ti 3 C 2 T x (Mn-Ti 3 C 2 T x ) exhibited enhanced electrochemical activity in a three-electron oxygen reduction reaction (3e - ORR), enabling in situ self-sterilization by activating molecular oxygen to generate hydroxyl radicals (•OH), which demonstrated potent antibacterial effects against both Gram-negative and Gram-positive bacteria. Density functional theory calculations revealed that Mn doping in MXene significantly reduced the free energy barrier of *OOH intermediate, promoting H 2 O 2 formation and subsequent reduction to •OH. The PEGylated Mn-Ti 3 C 2 (PEG@Mn-Ti 3 C 2 T x ) composite combined the superior hydrophilicity of PEG for effective protein repulsion with the enhanced conductivity of Mn-Ti 3 C 2 T x , enabling sensitive biosensing. Critically, the fabricated biosensor demonstrated high specificity for cTnI against common interferents and achieved reliable detection in spiked serum samples. It exhibited a broad detection range from 0.1 pg mL -1 to 500 ng mL -1 with an ultralow limit of 0.03 pg mL -1 . This work presents a novel strategy for combating biofouling and paves the way for designing robust biosensors capable of accurate and long-term operation in clinically relevant environments, holding great promise for point-of-care diagnostics.
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RSC Advances
·
2026
·Vol. 16
·期 13
·12165-12179
·
IF 6.1
Waqas Saeed,Ye Tian,Irshad Ahmad Mir,Baoji Miao,Amna Manzoor,Surjyakanta Rana,Xing Chen
Ammonia (NH3) detection at room temperature under varying humidity conditions is crucial for environmental monitoring, industrial safety, and healthcare. However, ammonia detection remains a challenge due to the lack of sensitivity and selectivity of current room temperature based sensors. In this context, Ti3C2Tx MXene and flower-like SnS2 composites were investigated for NH3 sensing. A comparative analysis of multilayered and few-layered nanohybrid composites demonstrated that the few-layered configuration displayed a markedly enhanced response to ammonia. Its larger surface area, higher electrical conductivity, and higher number of active sites contribute to its superior gas diffusion and charge transfer properties. The composite was further functionalized with Nafion (NF) to enhance sensitivity and selectivity under humid conditions. In an optimized NF-functionalized few-layered Ti3C2Tx/SnS2 sensor, we achieved a 12.11 response ratio towards 100 ppm NH3, with a response time of 42 s and a recovery time of 156 s, as well as excellent selectivity towards interfering gases. Reliability tests conducted in humid environments confirmed the excellent operational stability and durability of the proposed sensor. These experimental results demonstrate that the developed few-layered Ti3C2Tx/SnS2/NF nanohybrid composite provides a highly durable, sensitive, and selective platform for NH3 detection in practical applications at room temperature.
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Journal of Cleaner Production
·
2026
·
IF 10.7
Chong Li,Chunjie Wu,Yufei Xiao,Siqi Zhu,Yuhan Li,Kunyi Tong,Chenhao Zhang,Hui Li
Two-dimensional MXene nanosheets have attracted extensive attention due to their exceptional physicochemical properties. However, the conventional synthesis of MXenes relies heavily on hazardous fluoride-based etchants, causing severe environmental and safety risks. Herein, we report a clean, fluorine-free, and sustainable strategy for synthesizing oxygen-terminated Ti 3 C 2 T x MXene (Ff-Ti 3 C 2 T x ) via a novel chelation-assisted alkaline etching approach. By synergistically combining tetramethylammonium hydroxide with ethylenediaminetetraacetic acid, we successfully overcome the intrinsic aluminum-passivation bottleneck that severely restricts the etching efficiency of conventional pure alkaline systems. This dual-agent chelation system not only enables the controlled and efficient delamination of Ti 3 AlC 2 into monolayer Ti 3 C 2 T x nanosheets under extremely mild conditions but also delivers a record-high yield of 40%, representing a 60% improvement over existing fluorine-free methods. The resulting Ff-Ti 3 C 2 T x exhibits a highly hydrophilic, oxygen-rich surface (–OH, –O), which inherently enhances its electrochemical activity and light-harvesting performance. As an environmental sensor, it achieves ultrasensitive detection of p -nitrophenol with a low detection limit of 0.055 μM and a high sensitivity of 3.16 μA μM −1 cm −2 . Moreover, Ff-Ti 3 C 2 T x demonstrates exceptional near-infrared photothermal performance, with a mass extinction coefficient of 21.8 L g −1 cm −1 at 808 nm and a photothermal conversion efficiency of 42.1%. This work provides a scalable, environmentally benign, and high-yielding pathway for fluorine-free production of MXene and establishes Ff-Ti 3 C 2 T x as a versatile platform for next-generation environmental monitoring and sustainable energy applications.
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Advanced Materials Technologies
·
2022
·Vol. 7
·期 7
·2101639
·
IF 8.856
Chuqiao Hu,Hao Chen,La Li,Hui Huang,Guozhen Shen
The enriched surface functional group such as OH termination and unique 2D structure of Ti 3 C 2 T x MXene provide the feasibility to form hydrogen bonds with organic photosensitive materials as van der Waals heterostructures, thus can realize the improved photoresponsivity of near infrared (NIR) photodetectors (PDs). In this work, an organic–inorganic van der Waals heterostructure-based NIR PD array is designed using Ti 3 C 2 T x MXene as conductive electrodes and RAN film as active materials (Ti 3 C 2 T x -RAN PDs). The on-off ratio of the fabricated devices shows 6.25 times higher than that of PDs using thermal evaporated Au electrode (Au-RAN PDs) under 1064 nm laser excitations. The fabricated Ti 3 C 2 T x -RAN NIR PDs also possess outstanding mechanical stability with no obvious photoresponse degradation under different bending states and high transparency with a transmittance above 70% in the visible region. Owing to the high performance of the Ti 3 C 2 T x -RAN PDs, a 1024-pixel (32 × 32) image sensor array is fabricated to achieve delicate, vivid, and higher resolution imaging of a “deer,” opening up a new avenue for the biomimetic vision and flexible wearable accurate image sensing.
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CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Liu-Xin Liu,Wei Chen,Hao-Bin Zhang,Yu Zhang,Pingping Tang,Danyang Li,Zhiming Deng,Lvxuan Ye,Zhong-Zhen Yu
Although transition metal carbide (MXene) fibers are highly electrically conductive, the poor spinnability of neat MXene dispersion and the brittleness of the conductive fibers limit their applications. Herein, a coaxial wet spinning assembly strategy is adopted to fabricate mechanically strong and electrically conductive Ti 3 C 2 T x MXene-based core–shell fibers with regenerated cellulose (RC) as the tough component and graphene oxide/MXene (GM) as the conductive components. By an optimal structure design, the hollow RC@GM 90 fiber with the RC shell exhibits an increased strength of 134.7 MPa, a high toughness of 14.1 MJ m −3 , a large elongation at break of 13%, and a high conductivity of 2.37×10 3 S m −1 . By sewing on a textile substrate, the hollow RC@MXene fibers with a high conductivity of 3.68×10 4 S m −1 provide an extraordinary electromagnetic interference shielding efficiency of over 90 dB and outstanding solar-thermal energy conversion performances. Similarly, by improving spinnability of the MXene spinning dope with an aqueous dispersion of GO, solid core–shell GM@RC fibers with conductive GM shells are fabricated by the coaxial spinning, and the chemically reduced GM@RC fibers exhibit a high conductivity of 9.90×10 4 S m −1 and excellent electro-thermal energy conversion performances.
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Nano-Micro Letters
·
2021
·Vol. 13
·期 1
·1-11
·
IF 16.419
Li La,Liu Weijia,Jiang Kai,Chen Di,Qu Fengyu,Shen Guozhen
Flexible Zn-ion hybrid micro-supercapacitors (MSCs) array was fabricated with Ti 3 C 2 T x as the cathode via laser direct writing method, which present ultrastability up to 50,000 cycles after in-situ annealed treatment.
A digital timer driven by the obtained single MSC under bending state, together with a flexible LED displayer of the “TiC” logo lighted by the MSC arrays under twisting, crimping and winding conditions demonstrate the great potential application of the MSCs in integrated wearable electronics.
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