ACS Applied Materials & Interfaces
·
2019
·
IF 8.456
Yujie Li,Lei Ding,Yichen Guo,Zhangqian Liang,Hongzhi Cui,Jian Tian
The big challenging issues in photocatalytic H2 evolution are efficient separation of the photoinduced carriers, the stability of the catalyst, enhancing quantum efficiency, and requiring photoinduced electrons to enrich on photocatalysts’ surface. Herein, Ti3C2 MXene quantum dots (QDs) possess the activity of Pt as a co-catalyst in promoting the photocatalytic H2 evolution to form heterostructures with g-C3N4 nanosheets (NSs) (denoted g-C3N4@Ti3C2 QDs). The photocatalytic H2 evolution rate of g-C3N4@Ti3C2 QD composites with an optimized Ti3C2 QD loading amounts (100 mL) is nearly 26, 3 and 10 times higher than pristine g-C3N4 NSs, Pt/g-C3N4, and Ti3C2 MXene sheet/g-C3N4, respectively. The Ti3C2 QDs increase the specific surface area of g-C3N4 and boost the density of the active site. Besides, metallic Ti3C2 QDs possess excellent electronic conductivity, causing the improvement of carrier transfer efficiency.
研究领域:
材料科学
·
能源化学
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产品关联
DOI
PubMed
高影响因子
Nanoscale
·
2017
·Vol. 10
·期 3
·1111-1118
·
IF 7.367
Xu Chen,Xueke Sun,Wen Xu,Gencai Pan,Donglei Zhou,Jinyang Zhu,He Wang,Xue Bai,Biao Dong,Hongwei Song
Intracellular pH sensing is of importance and can be used as an indicator for monitoring the evolution of various diseases and the health of cells. Here, we developed a new class of surface-functionalized MXene quantum dots (QDs), Ti3C2, by the sonication cutting and hydrothermal approach and further explored their intracellular pH sensing. The functionalized Ti3C2 QDs exhibit bright excitation-dependent blue photoluminescence (PL) originating from the size effect and surface defects. Meanwhile, Ti3C2 QDs demonstrate a high PL response induced by the deprotonation of the surface defects. Furthermore, combining the highly pH sensitive Ti3C2 QDs with the pH insensitive [Ru(dpp)3]Cl2, we developed a ratiometric pH sensor to quantitatively monitor the intracellular pH values. These novel MXene quantum dots can serve as a promising platform for developing practical fluorescent nanosensors.
研究领域:
生物医学工程
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材料科学
·
细胞生物学
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DOI
PubMed
高影响因子
Nanoscale
·
2019
·Vol. 11
·期 30
·14123-14133
·
IF 6.97
Qingwen Guan,Junfei Ma,Wenjing Yang,Rui Zhang,Xiaojie Zhang,Xiaoxiao Dong,Yuting Fan,Lulu Cai,Yi Cao,Yilin Zhang,Neng Li,Quan Xu
Quantum dots, derived from two-dimensional (2D) materials, have shown promise in bioimaging, sensing and photothermal applications, and in white light emitting devices (WLEDs). Herein, nitrogen and phosphorus functionalized Ti3C2 MXene based quantum dots (N,P-MQDs) were successfully prepared through a top-bottom hydrothermal method. This type of photoluminescent quantum dots has realized green fluorescence for the first time at around 560 nm with a photoluminescence quantum yield (PLQY) of 20.1%, the highest ever reported; meanwhile, it also exhibits excellent photostability and pH resistance capacities. Comprehensive characterization and well-resolved density functional theory (DFT) calculation were implemented to determine the mechanism of fluorescence shift and enhancement. Furthermore, the N,P-MQDs have been proved to efficiently act as fluorescent probes for macrophage labeling. In addition, the high sensitivity of the N,P-MQDs toward Cu2+ ions made them a low cost, sensitive, environment-friendly, and label-free fluorescence platform for Cu2+ detection. The outstanding performance of Ti3C2 MXene based quantum dots has demonstrated their great potential to be used as promising fluorescent probes in the fields of biological imaging, optical sensing, photoelectric conversion, etc.
研究领域:
生物成像
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光学传感
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材料科学
·
分析化学
✓ 已验证
DOI
PubMed
高影响因子
Analytical Methods
·
2023
·
IF 3.1
Yuxuan Bai,Mingwang Liu,Yu He,Gongwu Song
Recent years have witnessed the ever-increasing achievements of Ti3C2 MXene quantum dots (Ti3C2 MQDs) and their vital contributions to fluorescent biosensing. However, the applicability and flexibility of most Ti3C2 MQDs-based sensors are limited by their emission of a single blue wavelength. To address this issue, we present a facile strategy to utilize carbon dots as the model to construct a ratiometric fluorescent sensor based on fluorescence resonance energy transfer to quantitatively monitor crystal violet. The fabricated probe exhibited dual emission at 440 and 565 nm respectively, when introducing crystal violet, the peak at 565 nm was quenched but 440 nm remained constant. Further aiming for portable, convenient, and on-site analysis, an innovative smartphone-assisted platform provides promising perspectives on the future in-situ quantitation. This work creates a general strategy for constructing the Ti3C2 MQDs-based composite fluorescent system, as well as suggests great application potential in food security monitoring.
研究领域:
材料科学
·
分析化学
·
食品安全
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Applied Materials Today
·
2020
·
IF 8.352
Xin Du,Tianyu Zhao,Ziyuan Xiu,Zipeng Xing,Zhenzi Li,Kai Pan,Shilin Yang,Wei Zhou
Novel BiVO 4 @ZnIn 2 S 4 /Ti 3 C 2 MXene quantum dots (QDs) assembly all-solid-state direct Z-scheme photocatalyst is fabricated via in-situ growth combined with two-step solvothermal strategy, which forms a hierarchical core-shell structure. The proper energy band structure of BiVO 4 and ZnIn 2 S 4 and the formation of a good solid-solid contact interface between them promote the construction of Z-scheme system, which achieves effective charge separation. It is surprisingly discovered that Ti 3 C 2 MXene QDs can be applied as cocatalysts for photocatalytic overall water splitting, which could accelerate the surface redox kinetics of the catalyst due to the unique properties of Ti 3 C 2 MXene QDs . In particular, due to its excellent metal conductivity, a Schottky barrier can be formed at the interface in contact with ZnIn 2 S 4 , further promoting charge separation. BiVO 4 @ZnIn 2 S 4 /Ti 3 C 2 MXene QDs achieves effective visible-light-driven pure water splitting into O 2 and H 2 evolution rates up to 50.83 and 102.67 μmol g −1 h −1 (~1:2). In addition, it also shows high photocatalytic degradation Bisphenol A efficiency of ~96.4 %. The high photocatalytic performance can be ascribed to the all-solid-state direct Z-scheme structure favoring spatial charge separation, Ti 3 C 2 MXene QDs as cocatalysts promoting proton reduction, and hierarchical core-shell structure offering more surface active sites. This work provides new insights to fabricate high-performance direct Z-scheme assembly system.
研究领域:
材料科学
·
光催化
·
能源化学
·
纳米材料
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环境科学
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半导体物理
·
表面科学
✓ 已验证
DOI
高影响因子
ACS Applied Energy Materials
·
2022
·
IF 6.959
Lan Ding,Senwei Zeng,Weiye Zhang,Chao Guo,Xinyi Chen,Bo Peng,Zhongpeng Lv,Hongjun Zhou,Quan Xu
Solar-driven photocatalytic hydrogen production is considered an effective strategy to mitigate the current energy and environmental challenges. Herein, a function heterostructure photocatalyst of 1D CdS nanorod rationally supported nitrogen-doped Ti3C2 MXene quantum dots (N-MQDs) is successfully constructed via the self-assembly strategy. Impressively, N-MQDs/CdS exhibits superior photocatalytic hydrogen production performance with an efficiency rate of 17094 μmol g–1 h–1, which is 14.79 times higher than pure CdS. The strong oxidizing performance of N-MQDs/CdS also presents an efficient activity for the photodegradation of phenol. The significant enhancement in performance is mainly due to the synergistic effect of the tight interfacial contact and matched energy levels between the highly conductive Ti3C2 MXene quantum dots and 1D CdS nanorod, which greatly accelerates the separation and transfer of photogenerated carriers. Regulating the energy band structure of photocatalysts via multifunctional MXene materials could hopefully motivate further interest in the reasonable design of MXene-semiconductor photocatalytic materials in energy and environmental applications.
研究领域:
材料科学
·
化学
·
环境科学
·
能源科学
✓ 已验证
DOI
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2023
·
IF 4.4
Xun Zhou,Juerui Zhang,Dongyan Huang,Yinhui Yi,Kechen Wu,Gangbing Zhu
In this work, a ratiometric fluorescence sensing platform was established to detect Cu 2+ and D-PA ( d -penicillamine) based on nitrogen-doped Ti 3 C 2 MXene quantum dots ( N -MODs) that was prepared via a simple hydrothermal method and exhibited strong fluorescent and photoluminescence performance as well as excellent stability. Since the oxidation reaction between o -phenylenediamine (OPD) and Cu 2+ induced the formation of 2,3-diaminophenazine (ox-OPD) which not only can emerge an emission peak at 570 nm, but also inhibit the fluorescence intensity of N -MQDs at 450 nm, a ratiometric reverse fluorescence sensor via fluorescence resonance energy transfer (FRET) was designed to sensitively detect Cu 2+ , where N -MQDs acted as energy donor and ox-OPD as energy acceptor. More importantly, another considerably interesting phenomenon was that their catalytic oxidation reaction can be restrained in the presence of D-PA because of the coordination of Cu 2+ with D-PA, further triggering the obvious changes in ratio fluorescent signal and color, thus a ratiometric fluorescent sensor of determining D-PA was proposed also in this work. After optimizing various conditions, the ratiometric sensing platform showed rather low detection limits for Cu 2+ (3.0 nM) and D-PA (0.115 μM), coupled with excellent sensitivity and stability.
研究领域:
分析化学
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材料科学
·
纳米技术
·
传感器与执行器
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2022
·
IF 9.221
Yuxuan Bai,Yu He,Manman Wang,Gongwu Song
Ti 3 C 2 MXene quantum dots (Ti 3 C 2 MQDs) are recognized as promising new nanomaterial recently, while the majority of the Ti 3 C 2 MQDs manifest limited maximum emission in the blue-light range. Herein, the green fluorescence nitrogen, phosphorus-doped Ti 3 C 2 MQDs (N, P-Ti 3 C 2 MQDs) were synthesized via facile microwave-assisted method, which greatly reduces the reaction time. The as-prepared N, P-Ti 3 C 2 MQDs showed excitation-dependent photoluminescence , anti-photobleaching, and favorable dispersibility . Interestingly, the fluorescence of N, P-Ti 3 C 2 MQDs can be quenched by 1,10-phenanthroline-Fe (II) complex (Phen-Fe 2+ ) via inner filter effect (IFE), accompanied by the increased orange color. After introduction of nitrite (NO 2 - ), owing to the redox reaction between NO 2 - and Fe 2+ , the fluorescence will be recovered and the color varies from orange to colorless gradually. Therefore, a colorimetric/fluorometric dual-modal recognition of NO 2 - was fabricated based on N, P-Ti 3 C 2 MQDs and Phen-Fe 2+ complex. Moreover, paper-based test trips were facilely made by the N, P-Ti 3 C 2 MQDs/Phen-Fe 2+ sensing system in response to ultrafast-response, real-time detection of NO 2 - with the assistant of smartphone. This study tendered a novel dual-channel method for real-time visual assay of NO 2 - as well as provided insightful research into functionalized Ti 3 C 2 MQDs regarding in food analysis.
研究领域:
材料科学
·
分析化学
·
纳米技术
·
环境科学
·
食品科学
✓ 已验证
产品关联
DOI
高影响因子
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