SENSORS AND ACTUATORS B-CHEMICAL
·
2017
·
IF 5.401
Long Wu,Wenmin Yin,Xuecai Tan,Pan Wang,Fan Ding,Huan Zhang,Biru Wang,Weiyun Zhang,Heyou Han
It is attractive but remains challenging to develop nanomaterials-based methods to realize the colorimetric detection of ultratrace biological analytes. In this work, an HAuCl 4 -H 2 O 2 system was developed for the visual detection of intracellular hydrogen peroxide (H 2 O 2 ) based on the Au-Pt/SiO 2 sensing platform. Owing to their excellent intrinsic peroxidase-like activity, Au-Pt/SiO 2 nanospheres were introduced to catalyze the decomposition of H 2 O 2 and then directly reduce HAuCl 4 into gold nanoparticles (Au NPs) for the naked-eye detection. The produced Au NPs behaved color variations from light purple to wine red as H 2 O 2 concentration increased. Under the optimal conditions, this strategy showed excellent sensitivity for H 2 O 2 with a detection limit of 0.1 nM by naked-eye readout and 0.1 pM by UV–vis spectrometer (S/N = 3), as well as acceptable selectivity for H 2 O 2 , which could meet the demand for the detection of H 2 O 2 in biological systems. The method was further validated by the determination of H 2 O 2 in HeLa cells with low cellular cytotoxicity. Thus, this strategy would provide simple and sensitive detection of H 2 O 2 in biological systems, revealing the potential application in clinical, biological and environmental researches.
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JOURNAL OF MOLECULAR LIQUIDS
·
2024
·
IF 5.3
Dawei Xiang,Manying Zhu,Yuefeng Chen,Shixing Wang,Zhengwu Peng,Dekun Zhang,Likang Fu
Gold is a widely used non-renewable resource, and its recycling is the key to solve the problem of dwindling gold resources. In this study, a novel covalent organic framework adsorbent (COF-pPDI@TAP) is developed for efficient Au(III) capture. The synthesis of the adsorbent was confirmed by FTIR and XRD characterization. The adsorption performance of COF-pPDI@TAP was studied by batch adsorption experiments. The maximum adsorption of Au(III) by COF-pPDI@TAP reached 779.02 mg/g in the adsorption experiments. Kinetic and isotherm results show that the adsorption is a monolayer chemisorption process controlled by particle diffusion. The positive value of ΔH indicates that COF-pPDI@TAP needs to absorb energy to maintain the reaction during the adsorption of Au(III), and the reaction is endothermic. In addition, COF-pPDI@TAP maintained a very high adsorption efficiency after five cycles of experiments, and could selectively capture Au(III) from different concentrations of polymetallic solutions. COF-pPDI@TAP has excellent anti-interference ability and good reusability. It is demonstrated by zeta potential, XRD, XPS and FT-IR that electrostatic interaction, chelation and reduction occurred during the adsorption process. These studies demonstrate the value of COF-pPDI@TAP for gold recovery applications.
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JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2024
·Vol. 171
·期 5
·057513
·
IF 3.1
Rui Cao,Guoshun Chen,Chuanyi Feng,Yu Qi,Kun Xiang,Peipei Li,Jun Wang,Xucheng Fu,Cheng Yang,Ju Wu
Cadmium (Cd(II)) is highly toxic to environmental, and while many approaches have been developed to measure cumulative Cd(II) concentration over time, online monitoring of spatiotemporal changes remains challenging. To address this, an electrochemical sensor for determination of ultra-trace Cd(II) was developed, based on gold/graphene oxide/copper oxide (Au/GO/CuO) nanomaterials modifying glassy carbon electrode. CuO nanoparticles were prepared by a green synthesis method using plant extract, and the Au nanoparticles were deposited on the GO/CuO nanosubstrates by an in situ electrochemical method. The prepared nanocomposites were characterized by field-emission scanning electron microscopy, X-ray diffraction, and X-ray photoelectron spectroscopy. The CuO nanoparticles are layered flower-like with an average particle size of 200–500 nm. Au/GO/CuO nanocomposites with high specific surface area and excellent electronic transmission capability enhanced the electrochemical signal of the sensor. Owing to the synergistic effect of Au/GO/CuO, the sensor exhibited good performance to Cd(II) in the ultra-wide range of 5 × 10−11–5 × 10−7 M with a detection limit of 2 × 10−11 M. The sensor was successfully quantified for determining Cd(II) with desirable recovery, displaying outstanding long-term stability, high sensitivity, and reproducibility. After validating its accuracy, this sensor was successfully used for detection of Cd(II) in water and cosmetic samples.
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JOURNAL OF HAZARDOUS MATERIALS
·
2024
·
IF 12.2
Xinrong Li,Shuliang Chen,Peng Yang,Yue Lin,Chen Chen,Xianzhi Hu,Futing Zi
With the gradual depletion of natural gold ore , waste printed circuit boards (WPCBs) have become one of the most attractive alternatives to gold ore. Here, a series of quaternary phosphonium adsorbents with a large size were successfully synthesized by adjusting the number of functional groups and carbon chain length of functional monomers , which can be used for selective recovery of gold(III) from WPCBs leaching solution . The quaternary phosphonium adsorbent (PS-TEP) prepared by the nucleophilic substitution reaction between triethyl phosphine with the smallest volume and chloromethylated polystyrene (PS-Cl) exhibited the best gold loading capacity (617.90 mg g −1 ). The adsorption mechanism of gold(III) on PS-TEP surface mainly involves anion exchange between AuCl 4 − and Cl − in the adsorbent. The charge level of the H atom closest to –CH 2 –P + group directly determines the strength of the interaction between the adsorbent and the gold ion . Multiwfn and VMD programs visually confirm the weak interaction between PS-TEP + and AuCl 4 − . After 5 adsorption-stripping cycles, the adsorption rate of gold(III) in solution remained at about 99 %. In addition, PS-TEP exhibited good gold(III) selectivity in both simulated and actual WPCBs gold leaching solutions. These results indicate that the large-particle PS-TEP with high capacity is suitable for selective gold recovery from WPCBs leaching solution.
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Materials Today Chemistry
·
2024
·
IF 6.7
Zhuluni Fang,Yihan Liu,Jinteng Qi,Miao Yu,Yuhang Wang,Yunfeng Qiu,Zhuo Ma,Shaoqin Liu
Solar-driven interfacial water evaporation holds great promise for water purification and desalination, but challenges such as insufficient light absorption, suboptimal energy conversion, and microbial contamination hinder its practical applications. This study presents a novel Au@ZIF-8/Ti 3 C 2 T x alginate hydrogel, integrating nanocomposites into a three-dimensional hydrogel network to enhance both water transport and light-to-heat conversion. The incorporation of Au nanoparticles significantly improves light absorption, while the Schottky junction between ZIF-8 and Ti 3 C 2 T x promotes photocatalytic generation of reactive oxygen species (ROS), including superoxide radicals (O 2 − ) and singlet oxygen ( 1 O 2 ). This photocatalytic activity, combined with the photothermal effects of Ti 3 C 2 T x , leads to effective bacterial sterilization, achieving 99.54 % and 97.22 % antibacterial efficiency against E. coli and S. aureus , respectively. The hydrogel exhibits a high evaporation rate of 1.589 kg m −2 h −1 and demonstrates a 100 % steam sterilization rate against both bacterial strains under one sun illumination. These findings highlight the potential of the Au@ZIF-8/Ti 3 C 2 T x alginate hydrogel as a promising, efficient, and cost-effective sterilization strategy for various applications, including water purification, desalination, and disinfection in off-grid areas and specialized settings.
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TALANTA
·
2024
·
IF 5.6
Haibo Chen,Yan Luo,Wenrong Cai,Laidi Xu,Junyao Li,Yong Kong
Au nanoparticles (AuNPs) are decorated by l -cysteine (L-Cys), and the resultant chiral L-Cys/AuNPs can be used for colorimetric discrimination and spectroscopic detection of the tyrosine (Tyr) enantiomers . Melamine (Mel) can induce the aggregation of the L-Cys/AuNPs through ligand exchange, leading to a distinct color change from wine red to purple. Owing to the same rotatory direction of L-Cys/AuNPs and L-Tyr, the L-Cys/AuNPs exhibit a significantly higher binding affinity toward L-Tyr than D-Tyr, and thus the Mel induced aggregation of the L-Cys/AuNPs is greatly alleviated by the protection from the L-Tyr protective layer. Therefore, the Tyr enantiomers can be simply discriminated by naked eyes. In addition, the absorbance of the aggregated L-Cys/AuNPs at ∼630 nm increases linearly with decreasing concentrations of L-Tyr ranging from 10 nM to 1 mM due to the weakened protection effect from L-Tyr, and thus spectroscopic detection of L-Tyr can also be accomplished by the developed L-Cys/AuNPs with a limit of detection (LOD) of 5.3 nM.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2017
·
IF 9.446
Yue Chang,Kai Yu,Chenxi Zhang,Zequn Yang,Yajun Feng,He Hao,Yuanzhi Jiang,Lan-Lan Lou,Wuzong Zhou,Shuangxi Liu
New ternary composites based on three dimensionally ordered macroporous (3DOM) SrTiO 3 (CdS/Au/3DOM-SrTiO 3 ) were prepared and used as photocatalysts in visible light (λ > 420 nm) photocatalytic water splitting for hydrogen evolution. Through optimizing the pore size of 3DOM-SrTiO 3 materials and the loading amounts of Au and CdS , CdS/Au/3DOM-SrTiO 3 (300), templated by 300 nm sized poly(methyl methacrylate) colloids, was found to exhibit a remarkably enhanced photocatalytic hydrogen evolution rate (2.74 mmol/h⋅g), which was 3.2 times as high as that of CdS/Au/C-SrTiO 3 catalyst based on commercial SrTiO 3 . This notably enhanced photocatalytic performance was mainly attributed to the slow photon enhancement effect of 3DOM-SrTiO 3 (300) material, which significantly promoted the light harvesting efficiency of ternary composite for the slow photon region of 3DOM-SrTiO 3 (300) was well matched with the optical absorption band of photocatalyst. Further depositing Pt nanoparticles on CdS/Au/3DOM-SrTiO 3 (300) composite as a co-catalyst, an extraordinarily high hydrogen evolution rate (up to 5.46 mmol/g⋅h) and apparent quantum efficiency (42.2% at 420 nm) were achieved because of the synergistic effect of efficient carrier separation, Au SPR effect, and slow photon effect. Furthermore, these ternary CdS/Au/3DOM-SrTiO 3 composite photocatalysts were very stable and could be easily recycled four times in visible light photocatalytic water splitting experiments without any loss in activity.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2025
·
IF 7.7
XianWei Wang,Yue Zhai,Yuanhui Chen,Wei Zhang,Pei Liang,Qiangqiang Zhu,Hong Zhang,Juan Kang,Le Wang
s The development of a highly sensitive and reliable surface-enhanced Raman scattering (SERS) substrate is crucial for overcoming the limitations in its practical applications. Herein, a novel 3D waffle-like SERS substrate with high activity is constructed for detecting trace amounts of myricetin in complex analytes extracted from green tea. The substrate is achieved through a layered ternary film structure, where ordered poly (methyl methacrylate) opal photonic crystals (PMMA OPCs) serving as a 3D hot spots template and enhancing the performance of CsPbBr 3 film that facilitates efficient charge transport, and an Au film covered over the CsPbBr 3 film modulating the vibronic coupling and providing plasmonic hot spots. The PMMA-CsPbBr 3 -Au substrate exhibits a low detection limit of 10 −10 M with an 8.9 × 10 7 enhancement factor, signal repeatability and stability for R6G molecules. Furthermore, the SERS detection of myricetin content in Longjing green tea from different years is carried out, and the results show a good linear positive correlation with storage years (R 2 =98.2 %), demonstrating the potential application of 3D substrate for sensitive and reproducible SERS.
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2024
·
IF 4.3
Heng Guo,Hongji Li,Mengyang Xu,Juan Zhou,Dan Zhang,Dandan Wang,Wei Sun
In this study, a core–shell structured bimetallic nano-cube, Au@Ag NCs, was prepared by seed-mediated growth procedure. The array structure of Au@Ag NCs was achieved at the interface through the autonomous assembly technique at the three-phase boundary. Employing polydimethylsiloxane (PDMS) as a flexible carrier, the array structure was effortlessly transferred to the PDMS membrane, bypassing the need for rigid substrates through a simple “pasting” method. This yielded a highly flexible and transparent SERS substrate with an array structure (Au@Ag NCs/PDMS membrane, AAP). In order to promote the selective detection property to the practical samples, molecularly imprinted polymers (MIPs) were coated on the surface of membrane to prepare the imprinted membrane (Au@Ag NCs/PDMS-MIMs, AAP-MIMs). It was demonstrated from the results that the AAP-MIMs exhibited high SERS sensitivity, stability, and uniformity. Furthermore, the flexible substrate possessed commendable mechanical strength, and facilitated the detection of analytes on irregular surfaces. In summary, this substrate held promising potential for practical on-site detection and analysis of specific target substances.
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SENSORS
·
2024
·Vol. 24
·期 21
·6931
·
IF 3.4
Qilin Wang,Wei Wang,Yizhuo Fan,Jian Fang,Yu Chen,Shengping Ruan
Ethyl acetate is a critical medical indicator for detecting certain types of cancer. However, at present, available sensitive materials often exhibit drawbacks, such as high operating temperatures and poor responses to low concentrations of ethyl acetate. In this study, a ZnO nanorod sensing material was prepared using high-temperature annealing and a hydrothermally synthesized metal-organic framework (MOF) as a template. Au nanodots (AuNDs) were subsequently modified on the ZnO nanorods using an in situ ion reduction, which provided a better dispersion of Au nanodots compared with that obtained using the common reductant method. A variety of characterization methods indicate that the highly dispersed AuNDs, which possess a high catalytic activity, were loaded onto the surface as active centers, leading to a significant augmentation in the adsorption of oxygen on the surface compared with the original ZnO material. Consequently, the AuND@ZnO material exhibited heightened responsiveness to ethyl acetate at a lower operating temperature. The Au@ZnO-based sensor has a response rate (Ra/Rg) of 41.8 to 20 ppm ethyl acetate gas at 140 °C, marking a 17.4-fold increase compared with that of the original material. Due to its low power consumption and high responsiveness, AuND@ZnO is a promising candidate for the detection of ethyl acetate gas in medical applications.
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TALANTA
·
2025
·
IF 6.1
En Han,Ting Gao,Ming Bao,Jianrong Cai
A novel strategy based on flower-like nanocomposite combined with molecularly imprinted polymers (MIP) was developed to achieve electrochemical sensing toward tert-butylhydroquinone (TBHQ) with high sensitivity and selectivity. The flower-like nanocomposite of gold nanoparticles functionalized zinc oxide nanoflowers (ZnO@Au NFs) was prepared by one-step in-situ reduction of gold nanoparticles on the exterior of zinc oxide nanoflowers. Subsequently, the electrodeposition of MIP was taken place on the surface of three-dimensional ZnO@Au NFs in the presence of monomer pyrrole and template molecule TBHQ by cyclic voltammetry, and the morphology of imprinted films could be clearly observed by scanning electron microscopy (SEM). The nanocomposite of ZnO@Au NFs provided a specific surface area of 9.94 m 2 /g for MIP electrodepositing due to a good deal of three-dimensional petal-like structures. More importantly, the obtained flower-like MIP nanocomposite increased the electroactive area and promoted the electrical signal when TBHQ was oxidized in the imprinted cavities, which significantly improved the sensitivity and selectivity for TBHQ determination. Under the optimal conditions, the proposed sensor was able to determine TBHQ within a broad linear range from 0.5 to 200 μM, with a detection limit as low as 58 nM. Besides, the practicability of this sensor was validated in real samples, obtaining well-pleasing recoveries from 95.0 % to 106.6 %. This flower-like MIP-based electrochemical sensor showed high sensitivity, good specificity and acceptable reproducibility, providing a promising platform for highly sensitive sensing of TBHQ.
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Scientific Reports
·
2024
·Vol. 14
·期 1
·1-13
·
IF 3.8
Dezhakam Ehsan,Vayghan Roya Faraghi,Dehghani Sarina,Kafili-Hajlari Taha,Naseri Abdolhossein,Dadashpour Mehdi,Khalilzadeh Balal,Kanberoglu Gulsah Saydan
Nowadays, rapid and facile diagnosis of cancer using user friendly processes has attracted much attention. In this regard, an electrochemical (EC) biosensor with high sensitivity was fabricated by merging MIL156 MOF@COF nanocomposite with Au nanoparticles for the detection of CA15-3. Herein, metal clusters of MIL-156 as a Metal organic frameworks (MOF) were coated by a crystalline covalent organic frameworks (COF) through covalent bonding and created core-shell-like structures. The active part of the working electrode was modified in two consecutive steps. First, MIL-156 MOF@COF and then Au nanoparticles were electrodeposited on the glassy carbon electrode (GCE). The porosity of nanocomposite has significantly increased the surface area and improved the conductivity. Au nanoparticles also form an acceptable substrate for bonding antibodies due to their high affinity with amino groups. In addition, Au nanoparticles amplify the EC signal of the biosensor with their undeniable conductivity. Nanocomposite was characterized with XRD, SEM, and EDAX techniques. To investigate the proposed biosensor, differential pulse voltammetry (DPV) was used as an analytical technique. The CA15-3 calibration provided a linear range between concentrations of 30 and 100 nU/mL, thus expressing the powerful diagnostic potential of the designed biosensor. Furthermore, the suggested biosensor has been used in serum samples and discriminate breast cancer sufferers from healthy individuals with high confidence levels.
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