Crystals
·
2024
·Vol. 14
·期 8
·728
·
IF 2.4
Boyu Wang,Zhiyuan Jiang
Recently, there has been a growing interest in skutterudite (SKD) compounds containing electronegative elements such as Br, Cl, S, Se, and Te, owing to their increased diversity and the versatility of filler atoms. This study focused on the thermoelectric performance of a series of (Ni, Te) co-doped SKDs filled with the electronegative element S, denoted as SxNi0.4Co3.6Sb11.2Te0.8(x= 0, 0.1, 0.2, and 0.3). These compounds were prepared using a combination of a solid-state reaction and spark plasma sintering techniques. The results showed that (Ni, Te) co-doping introduced excess electrons in the SKD lattice, while the incorporation of the element S into the SKD voids optimized carrier concentration. This led to a considerable increase in the absolute Seebeck coefficient to 110.6 μV K−1at ambient temperatures. The presence of S fillers induced phonon resonance scattering and point scattering, which reduced lattice thermal conductivity and ultimately improved the thermoelectric figure of meritzT, which reached 0.93 for S0.3Ni0.4Co3.6Sb11.2Te0.8at 823 K.
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Advanced Electronic Materials
·
2024
·Vol. 10
·期 6
·2300809
·
IF 5.3
Abdul Basit,Jiwu Xin,Yubo Luo,Ji-Yan Y. Dai,Junyou Yang
Lead-free polycrystalline manganese telluride holds great potential in the development of waste heat recovery due to its fascinating physical properties. However, the poor thermoelectric (TE) performance in the p-type MnTe alloys always results from their inferior carrier concentration, leading to low power factor and high thermal conductivity which restrict the overall thermoelectric performance. In this work, the problem is solved by decoupling its electrical and thermal transports through the hole donor Ge-deficiency in MnTe + x mol.% GeTe (0 ≤ x ≤ 4) compounds. Intrinsically, extra GeTe in MnTe + x mol.% GeTe compound offers free charge carriers due to a narrow bandgap comparatively, realizing not only a full assessment of stimulated electrical performance but also an enhanced power factor. Moreover, benefiting from the nano-precipitates and tweed microstructures, the lattice thermal conductivity effectively reduces due to the intensive phonon scattering accordingly. Ultimately, a maximum ZT of ≈1.2 at 873 K in the 3 mol.% GeTe doped MnTe sample is realized.
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CHEMICAL ENGINEERING SCIENCE
·
2024
·
IF 4.1
Zhaohua Jiang,Jinjin Wen,Huiting Xu,Yufen Zhang,Haonan Zhai,Zhijie Cui,Honghai Wang,Junjie Qi,Wen Liu,Jiapeng Liu
Aqueous zinc-tellurium (Zn-Te) batteries based on conversion reactions between Zn and Te have sparked significant interest due to their cost-effectiveness, high theoretical specific capacity and outstanding safety features. Nevertheless, the sluggish kinetics pose a barrier to the advancement of aqueous Zn-Te batteries. In this study, zero-dimension (0D) nanodots and three-dimensional (3D) nanoflowers molybdenum diselenide (MoSe 2 ) are in situ grown on the holey reduced graphene oxide (HrGO) by a confinement synthesis strategy. Benefiting from the simultaneous presence of (0D/3D)MoSe 2 , excellent conductivity of holey reduced graphene oxide and unique hierarchical structure, the (0D/3D)MoSe 2 @HrGO hybrid greatly promotes the redox kinetics between Zn and Te conversion. Consequently, the constructed aqueous Zn-Te batteries equipped with a Te@(0D/3D)MoSe 2 @HrGO cathode demonstrate remarkable specific capacity (reaching 505 mAh/g at a current density of 0.15 A/g) along with outstanding long-term cycling stability. Additionally, the underlying conversion mechanism has been meticulously explored through extensive analytical techniques. This research introduces an innovative approach to boost the electrochemical performance of aqueous zinc-tellurium batteries.
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JOURNAL OF FLUORESCENCE
·
2024
·
IF 2.6
Chen Wanqiu,Chen Ting,Fang Min,Zhu Weiju,Li Cun
In this work, a simple and sensitive N-acetyl-L-cysteine (NAC)-covered CdTe quantum dots (NAC-CdTe QDs) fluorescence probe for continuous detection of Co 2+ and pyrophosphate ions (PPi, P 2 O 7 4− ) was synthesized. The fluorescence of the quantum dots was significantly quenched by Co 2+ through the coordination of Co 2+ and the carboxyl groups on the NAC-CdTe quantum dots. Interestingly, the combination of NAC-CdTe quantum dots with Co 2+ yields a new fluorescence probe of Co 2+ -modified NAC-CdTe QDs (Co 2+ @NAC-CdTe). The addition of PPi restored the fluorescence due to the competition between PPi and carboxyl groups with Co 2+ causing Co 2+ to detach from the surface of Co 2+ @NAC-CdTe quantum dots. Thus, a sensitive and reversible detection of Co 2+ and PPi had been successfully established. The Co 2+ @NAC-CdTe quantum dots fluorescence probe exhibits excellent selectivity and high sensitivity toward PPi detection with low detection limit of 0.28 μM. In addition, the novel fluorescence probe was successfully applied to detect the concentration of PPi in environmental water samples and in-vitro cells imaging.
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MICROCHIMICA ACTA
·
2017
·Vol. 184
·期 9
·3189-3196
·
IF 4.58
Wang Bei,Chen Miao-miao,Zhang Hai-qing,Wen Wei,Zhang Xiu-hua,Wang Sheng-fu
A fluorescence assay is described for the fluorometric determination of dopamine (DA). It based on the use of silica-coated CdTe quantum dots (QD@SiO 2 ). These were fabricated through a hydrothermal process. When DA is added to a solution of the QD@SiO 2 and then oxidized by oxygen under catalytic action of tyrosinase to form dopamine quinone, the fluorescence of QD@SiO 2 (acquired at excitation/emission wavelengths of 310/525 nm) decreases due to an electron transfer quenching processes. The assay has a linear calibration plot in the 0.05 to 30 μM DA concentration range and a 12.5 nM detection limit (at an S/N ratio of 3). The method was applied to the determination of DA in spiked human serum samples.
Schematic presentation of a fluorometric dopamine (DA) assay by using silica-coated CdTe QDs (QD@SiO 2 ). DA is oxidized by oxygen under catalytic action of tyrosinase to form dopamine quinone, and this causes the quenching of fluorescence of QD@SiO 2 at excitation/emission wavelengths of 310/525 nm.
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TALANTA
·
2017
·
IF 4.162
Jiexia Chen,Guang-Chao Zhao
A signal-on photoelectrochemical (PEC) biosensor based on nano-encapsulant of ascorbic acid-loaded apoferritin - assisted for protease detection is described. The loaded ascorbic acid could be released from the central cavity of apoferritin into the buffer solution as sacrificial electron donor to capture the photo-generated holes of CdTe quantum dots when light is turned on. In this system, the biosensor relied on monitoring the photocurrent intensity as a result of enzymatic substrate proteolysis in the homogeneous aqueous solution. A low detection limit of 2.7 ng mL −1 for trypsin in the linear range from 30 to 450 ng mL −1 is achieved. We believe that such a sensing system not only holds the potential ability as a probe for trypsin activity assay, but also could be used for the corresponding inhibitor-screening. It might provide a potentially feasible alternative tool for determining trypsin in human serum in a clinical laboratory. The established method could open a different perspective for PEC enzyme detection and provide a new platform for future development of PEC analysis with other clinically important proteins.
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TALANTA
·
2017
·
IF 4.162
Miao Yu,Yang Lu,Zhenjiang Tan
In this work, a novel and facile ratiometric fluorescence probe was prepared for the visual detection of dopamine (DA). In this detection system, red-emission CdTe@SiO 2 (r-QDs@SiO 2 ) was used as steady core of the probe and inverse microemulsion method was applied to synthesize uniform r-QDs@SiO 2 , this step could protect CdTe from contacting with human skin directly. Polydopamine (PDA) acted as response signal to detect DA, a very handy method which just combined polyethyleneimine (PEI) with DA together to synthesize PDA, this way for synthesis of PDA was much time-saving and non-toxic than any other methods. Differently from traditional analysis processes, the products of this experiment were also the analysis substances in final. Under optimum measurement conditions, the dual-emission ratiometric fluorescence probe was used for detections of DA in a concentration ranged from 10 μM to 80 μM with a detection limit of 0.12 μM, with addition of DA the color of the probe changed from red to green watched by naked eyes. In addition, the developed probe was also used for detections of DA in human serum samples successfully. This study provides a simple, time-saving and non-toxic approach for detections of DA without the requirement of complex equipment.
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OPTICAL MATERIALS
·
2025
·
IF 4.2
Wanqiu Chen,Min Fang,Weiju Zhu,Cun Li
In this paper, a sensitive Gd 3+ aggregation-induced emission (AIE) fluorescent quantum dots probe for tetracycline detection was designed based on mercaptopropionic acid (MPA)-capped CdTe quantum dots (MPA-CdTe QDs). Gd 3+ can coordinate with the carboxyl groups on the surface of MPA-CdTe QDs, which triggers the aggregation-induced enhancement fluorescence emission effect. Notably, the fluorescence of Gd 3+ -modified MPA-CdTe QDs (Gd 3+ @MPA-CdTe QDs) is quenched by tetracycline (TC). This fluorescent probe exhibits excellent selectivity and sensitivity, achieving the limit of detection of 4.26 nM. Consequently, the MPA-CdTe QDs show an “on-off” fluorescence response. Tetracycline molecule coordinates with Gd 3+ in Gd 3+ @MPA-CdTe QDs, promoting further aggregation of the quantum dots and forming a network structure. Additionally, the inner filter effect (IFE) contributes to fluorescence quenching. The Gd 3+ @MPA-CdTe QDs probe can be applied for detecting TC in milk and tap water, demonstrating significant application potential. Furthermore, Gd 3+ @MPA-CdTe QDs can be utilized for TC detection in living cells.
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TALANTA
·
2025
·
IF 6.1
Yanfei He,Dongdong Zhang,Qiong Wu,Gengan Du,Ruoting Liu,Xianqing Zhou,Yurong Zhang
Aflatoxin B1 (AFB1) has strong carcinogenicity, mutagenicity, and teratogenicity even at low concentrations, presenting a major risk to food safety and human health, hence, it is crucial to develop a sensitive detection technique for AFB1. Consequently, cadmium telluride (CdTe) quantum dots conjugated with AFB1 aptamers serve as fluorescent signal probes, whereas Fe 3 O 4 @UiO-66-NH 2 nanocomplexes are employed as magnetic carriers and fluorescence quenchers. Fe 3 O 4 @UiO-66-NH 2 reduces background signal interference, thereby enhancing detection sensitivity and Förster Resonance Energy Transfer (FRET) efficiency. We have developed a highly sensitive and selective magnetron fluorescence aptasensor based on FRET for the specific detection of AFB1. Under the ideal experimental conditions, the linear range of AFB1 is 0.001–200 ng/mL, with a linear equation of y = 0.16 x +0.65 (R 2 = 0.996), and the detection limit is 0.012 ng/mL. The aptasensor demonstrated superior selectivity, reproducibility, and stability for AFB1, the recoveries for real samples of corn and wheat ranged from 95 % to 103 %, demonstrating the feasibility and practicality of the sensor. Furthermore, the accuracy of the aptasensor was verified by comparison with the results of high performance liquid chromatography, indicating that the aptasensor holds significant potential for practical detection applications.
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ACS Nano
·
2024
·
IF 15.8
Yixin Hou,Pengfei Ma,Fei Long,Mingyang Liu,Yifan Zheng,Li Sun,Junjie Shi,Ke Niu,Jun Su,Yanan Ma,Yihua Gao
Air-rechargeable batteries integrating energy harvesting, conversion, and storage provide the most portable and popular approach to self-charging power systems. However, air-rechargeable batteries are currently mostly aqueous Zn-based battery systems in which it has remained a significant challenge to solve the low discharge capacities and poor cycling stability of chemical self-charging due to continuous insertion/extraction of large-size hydrated Zn2+. Herein, efficient Bi2Te3@C cathodes with an active carbon paper substrate are developed. Further ex situ characterization analysis confirms the energy storage mechanism regarding the coexistence of H+/Zn2+ coinsertion and conversion reaction in the aqueous Zn||Bi2Te3@C battery. Benefiting from the fast dynamics process attributed to the unique mechanism, a reliable energy supply is provided even in an extended temperature range from −10 to 45 °C. More importantly, Bi2Te3@C cathodes boost the superior and repeatable air-rechargeability. A discharge capacity of up to 264.20 mA h g–1 at 0.30 A g–1 is manifested after self-charging for 11.00 h. In addition, two quasi-solid-state battery devices are connected in series to continuously power a timer. After the device is discharged and then air self-charged for just a few seconds, an LED is lit.
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CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Jin Liu,Liexiang Ren,Jujie Luo,Ning Lv
In this study, bismuth telluride–based hybrids consisting of nanosheets were successfully prepared by disproportionation induced by microwave irradiation and applied on supercapacitor electrodes. Various analytical techniques were adopted to analyze the structure and composition of Bi 2 Te 3 /Bi 2 TeO 5 . The unique disproportionation (Te 0 →Te 2+ +Te 4+ ) results in an interlocking nanosheet, in which the lamellar interspersed structure on the lamella can be visualized through high-magnification scanning electron microscopy. The large layer spacing with the interspersed structure provides more storage sites for electrolyte ion interactions and allows for better stabilization of the electrode structure. Result of electrochemical studies indicates that Bi 2 Te 3 /Bi 2 TeO 5 enables a capacity of 860 F g −1 (1 A g −1 ) and maintains 74.5% of the initial capacity through 2000 charge/discharge cycles. The Bi 2 Te 3 /Bi 2 TeO 5 anode is integrated into an ultracapacitor to attain a remarkable energy density of 89 Wh kg −1 in 6 M KOH.
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FOOD CHEMISTRY
·
2024
·
IF 8.5
Yimeng Zhang,Chuanliang Wang,Guo Wei,Xuesong Wang,Wanhui Liu,Gangqiang Yang,Peng Zhang,Qinglian Li,Xuhui Geng,Lingxin Chen,Zhihua Song
Malachite green (MG) possesses high toxicity, therefore, the detection of MG in fish tissues is of vital importance. A novel core–shell MIPs doped CdTe quantum dots coated silica nanoparticles (CdTe-MIP/SiO 2 NPs) were synthesized via a simple one-pot strategy. The materials were characterized carefully. The resulting CdTe-MIP/SiO 2 NPs were coated on the thin layer chromatography plate, and coupled with miniaturized fluorimeter for fluorescence detection of MG in fish samples. The resulting CdTe-MIP/SiO 2 NPs based system possessed good linearity (0.01 ∼ 20 μmol/L), high recoveries (98.36 %∼101.45 %) and low detection limit (3.7 nmol/L) for MG. Furthermore, CdTe-MIP/SiO 2 NPs based system were employed to measure fish samples spiked with MG, meanwhile, HPLC was utilized to evaluate the accuracy and reliability. And the paired t -test was conducted to evaluate differences between fluorescence method and HPLC, P > 0.05 means no significant difference was observed, the results demonstrated that both fluorescence method and HPLC are suitable for MG analysis.
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