Materials
·
2024
·Vol. 17
·期 4
·854
·
IF 3.1
Peixuan Lin,Song Ye,Ling Pan,Ruihao Huang,Haoran Zhang,Deping Wang
In this research, upconversion nanocrystals incorporated with MOR zeolite composites were synthesized using the desilicated MOR zeolite as a host for the in situ growth of NaREF4(RE = Y, Gd) Yb/Er nanocrystals. The structure and morphology of the composites were studied with XRD, XPS, and TEM measurements, and the spectral studies indicated that the subsequent thermal treatment can effectively improve the upconversion emission intensity of Er3+. By using the NaYF4:Yb/[email protected]composite that holds the strongest upconversion emission, a probe of UCNC@DSiMOR/BPEI was constructed with the modification of branched poly ethylenimine for the detection of Cu2+. It was indicated that the integrated emission intensity of Er3+shows a linear dependence with the logarithm value of the Cu2+concentration ranging from 0.1 to 10 μM. This study offered a feasible method for the construction of UCNC@zeolite composites with enhanced upconversion emission, which may have a potential application as fluorescent probes for the detection of various metal ions by adjusting the doping luminescent center.
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PubMed
高影响因子
MICROCHIMICA ACTA
·
2024
·Vol. 191
·期 10
·1-11
·
IF 5.3
Ai Ding,Yu Hao,Han Yuting,Chang Yuan,Ma Yanhao,Wu Chenglong,Liu Mengning,Zhu Yongsheng,Li Shengbin,Dong Chengye,Cheng Yonghong
Detecting dopamine (DA) in biological samples is vital to understand its crucial role in numerous physiological processes, such as motion, cognition, and reward stimulus. In this work, p-type graphene on sapphire, synthesized via chemical vapor deposition, serves as substrate for the preparation of p-type Cu 2-x S films through solid-phase sulfurization. The optimized Cu 2-x S/graphene heterostructure, prepared at 250 °C using a 15-nm copper film sulfurized for 2 h, exhibits superior electron transfer performance, ideal for electrochemical sensing. It is confirmed that the spontaneous charge transfer from graphene to Cu 2-x S, higher Cu(II)/Cu(I) ratio (~ 0.8), and the presence of well-defined nanocrystalline structures with an average size of ~ 35 nm in Cu 2-x S significantly contribute to the improved electron transfer of the heterostructure. The electrochemical sensor based on Cu 2-x S/graphene heterostructure demonstrates remarkable sensitivity towards DA, with a detection limit as low as 100 fM and a dynamic range greater than 10 9 from 100 fM to 100 μM. Additionally, it exhibits excellent selectivity even in the presence of uric acid and ascorbic acid 100 times higher, alongside notable storage and measurement stability and repeatability. Impressively, the sensor also proves capable of detecting DA concentrations as low as 100 pM in rat serum, showcasing its potential for clinically relevant analytes and promising applications in sensitive, selective, reliable, and efficient point-of-care diagnostics. Graphical Abstract
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高影响因子
ACS Omega
·
2025
·
IF 4.3
Yixin Chen,Zexi Chen,Sheng Chu
Metal–organic frameworks (MOFs) hold significant potential for applications in gas adsorption and separation, catalysis, chemical sensing, and drug delivery. Zeolitic imidazolate frameworks (ZIFs) are a type of MOF composed of metal ions and imidazolate ligands, structurally similar to zeolite structures. ZIF-8, a widely studied ZIF material, is composed of zinc ions (Zn2+) and 2-methylimidazole as fundamental building blocks featuring unique porous structures, a high specific surface area, and excellent thermal and chemical stability. This study introduces a rapid room-temperature synthesis method for bimetallic ZIF-8 through the hydroxide double salt (HDS) precursor. Various characterization techniques confirmed that the synthesized bimetallic ZIF-8 exhibits uniform particle size and high crystallinity. Experimental results indicate that the HDS precursor provides numerous active sites, facilitating rapid nucleation and resulting in uniformly sized bimetallic ZIF-8 particles. By optimizing the ultrasonic time of HDS, the concentration of 2-methylimidazole, and the reaction time, the synthesis conditions were refined, producing bimetallic ZIF-8 particles with an average size of 135.0 nm and a minimum polydispersity index (PDI) of 0.024. Additionally, the copper ion adsorption performance was evaluated, with the synthesized bimetallic ZIF-8 showing the highest adsorption capacity of 1196.82 mg/g at pH 6, demonstrating its effectiveness in heavy metal removal.
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高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2024
·Vol. 35
·期 1
·1-11
·
IF 2.8
Changshi Hao,Yiding Wang,Hongpeng Wu,Shaojing Duan,Bo Liu,Luting Yan
We successfully developed a GH-PP-Pt/GCE electrode by compounding graphene hydrogel (GH) with poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonate) (PEDOT:PSS), and in situ electrodeposition of Pt nanoparticles. The experimental results prove that the performance of GH-PP-Pt/GCE to trace copper ions significantly improved, the sensitivity reaches 45.673 µA/µmol L −1 , the limit of detection is as low as 9.9 nmol L −1 , and the linear range is 0.08–10 µmol L −1 . Its detection ability is at a relatively high level among the existing Cu 2+ electrochemical detection sensors, and the repeatability, stability, and anti-interference are good.
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高影响因子
TETRAHEDRON LETTERS
·
2018
·
IF 2.125
Xianjiao Meng,Duanlin Cao,Zhiyong Hu,Xinghua Han,Zhichun Li,Dong Liang,Wenbing Ma
In this study, we have successfully synthesized a new coumarin based fluorescent chemosensor 1 , in which tren and quinolone are introduced as receptors for sequential recognition of Cu 2+ and PPi. The structure of chemosensor 1 was characterized by 1 H NMR, 13 C NMR and ESI-HR-MS. Sensor 1 showed an obvious “on-off” fluorescence quenching response toward Cu 2+ , and the quenching efficiency reached a maximum of 99.6% with the addition of 20 equiv. of Cu 2+ . The 1 -Cu 2+ complex showed an “off-on” fluorescence enhancement response toward PPi over many competitive anions, especially HPO 4 2− and H 2 PO 4 − . The detection limit of sensor 1 was 1.9 × 10 −6 M to Cu 2+ and 5.96 × 10 −8 M to PPi. In addition, sensor 1 showed a 1:1 binding stoichiometry to Cu 2+ and sensor 1 -Cu 2+ showed a 2: 1 binding stoichiometry to PPi in CH 3 CN/HEPES buffer medium (9:1 v/v, pH = 7.4). The stable pH range of sensor 1 to Cu 2+ and 1 -Cu 2+ to PPi was from 4 to 8.
研究领域:
分析化学
·
生物化学
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高影响因子
LUMINESCENCE
·
2019
·Vol. 34
·期 2
·193-199
·
IF 1.691
Nan Liu,Juan Hao,Lili Chen,Yonghai Song,Li Wang
Zeolitic imidazolate framework-8 (ZIF-8) loading rhodamine-B (ZIF-8@rhodamine-B) nanocomposites was proposed and used as ratiometric fluorescent sensor to detect copper(II) ion (Cu 2+ ). Scanning electron microscopy, Fourier transform infrared spectroscopy, X-ray powder diffraction, nitrogen adsorption/desorption isotherms and fluorescence emission spectroscopy were employed to characterize the ZIF-8@rhodamine-B nanocomposites. The results showed the rhodamine-B was successfully assembled on ZIF-8 based on the π-π interaction and the hydrogen bond between the nitrogen atom of ZIF-8 and –COOH of rhodamine-B. The as-obtained ZIF-8@rhodamine-B nanocomposites were octahedron with size about 150–200 nm, had good water dispersion, and exhibited the characteristic fluorescence emission of ZIF-8 at 335 nm and rhodamine-B at 575 nm. The Cu 2+ could quench fluorescence of ZIF-8 rather than rhodamine-B. The ZIF-8 not only acted as the template to assemble rhodamine-B, but also was employed as the signal fluorescence together with the fluorescence of rhodamine-B as the reference to construct a novel ratiometric fluorescent sensor to detect Cu 2+ . The resulted ZIF-8@rhodamine-B nanocomposite fluorescence probe showed good linear range (68.4 nM to 125 μM) with a low detection limit (22.8 nM) for Cu 2+ combined with good sensitivity and selectivity. The work also provides a better way to design ratiometric fluorescent sensors from ZIF-8 and other fluorescent molecules.
研究领域:
分析化学
·
材料科学
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高影响因子
LUMINESCENCE
·
2018
·Vol. 33
·期 7
·1268-1274
·
IF 1.671
Li Yang,Mulan Zeng,Yue Du,Li Wang,Bingxian Peng
A ratiometric fluorescence sensor for Cu 2+ detection was developed by employing carbon dots (CDs) as the reference fluorophore, and bovine serum albumin (BSA)–Au nanoclusters (AuNCs) both as specific recognition element and as response signal. The CDs were prepared by heating an acetic acid solution of chitosan at 180°C. The proposed nanoprobe was prepared by simply mixing the CDs and BSA–AuNCs. Here, the CDs were associated with BSA–AuNCs to form CDs/BSA–AuNCs nanoprobes based on electrostatic interaction and hydrogen bonds. In the hybrid fluorescent CDs/BSA–AuNCs nanoprobe, the emission of BSA–AuNCs at 640 nm was quenched by Cu 2+ , whereas the emission of CDs at 424 nm was maintained. The fluorescence changes of I 640 / I 424 had good linearity with Cu 2+ concentration in the range 1.5–600 nM, and the detection limit of the nanoprobe was 0.5 nM for Cu 2+ detection, almost 4 × 10 4 times lower than the maximum allowable amount of Cu 2+ in drinking water. The proposed method for detecting Cu 2+ also had high selectivity and feasibility.
研究领域:
分析化学
·
纳米生物技术
·
环境科学
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高影响因子
DYES AND PIGMENTS
·
2021
·
IF 4.889
Ziwei Lin,Sheng Wang,Qing Yan,Qinghua Yan,Derong Cao
Light is not the only stimuli which can coverts donor-acceptor Stenhouse adducts (DASAs) from the triene to the cyclopentenone form. Here, we firstly demonstrate that Cu 2+ can drive linear-to-cyclic isomerization of DASAs in acetonitrile , which increase the rate of color fading. Three different generations of DASAs ( DASA-1 , DASA-2 , and DASA-3 ) have been synthesized by Knoevenagel condensation to verify the universal applicability of the mechanism by which copper ions discolor DASAs. The Job's plot of DASA-1 to Cu 2+ indicated DASA-1 binds to Cu 2+ with a ratio of 1:1, and the 1 H NMR titration spectrum of Cu 2+ on DASAs as well as the UV–Vis absorption spectra with adding Cu 2+ showed that copper ions could induce the process of linear-to-cyclic isomerization of DASAs in acetonitrile. Based on this, we propose copper ions as the eraser of a DASA derived ink to achieve repeatable erasing. Furthermore, DASAs have been utilized as a Cu 2+ sensor with high selectivity and sensitivity.
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JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2016
·Vol. 16
·期 2
·1871-1882
·
IF 1.338
Shi Haowei,Yang Junya,Zhu Lizhong,Yang Yuxiang,Yuan Hongming,Yang Yubing,Liu Xiangnong
In this paper, the chain-like core–shell structure Fe3O4@SiO2@Chitosan composite nanoparticles were synthesized by a two-step coating and following crosslinking glutaraldehyde on chitosan shell. The composite particles showed nearly monodisperse
105 sized particles with a core diameter of 80 nm and chitosan shell thickness of 12 nm. The synthesis conditions of the product were studied, and the morphology and properties of the composite nanoparticles were characterized by IR, XRD, TEM, SEM, EDS and VSM. The adsorption properties of
Hg2+, Pb2+ or Cu2+ ions on Fe3O4, Fe3 O4@SiO2 and the composite particles were in detail studied using the colorimetric method based on forming colored mercuric dithizone, rhodamine-Pb2+ complex and DDTC-Cu(2+)
complex. The results showed, adsorption isotherm, kinetics and separation coefficient of heavy metal ions on these three magnetic nanoparticles were concerned with pH, metal ions’ electronic configuration, silica coating and chitosan shell respectively. In addition, the recycle efficiency
was also studied. The findings demonstrated that Fe3O4@SiO2@Chitosan composite nanoparticles have great application value in the adsorption and separation of heavy metal ions.
研究领域:
环境科学
·
材料科学
·
化学工程
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高影响因子
Analytical Methods
·
2017
·Vol. 9
·期 42
·6044-6048
·
IF 1.9
Yao Gu,Meiling Wang,Guizhen Li
1,4-Dihydroxyanthraquinone (1,4-DHAQ, a fluorophore) doped carbon nanotubes@cellulose (1,4-DHAQ-doped CNTs@CL) nanofibrous membranes have been prepared via electrospinning and subsequent deacetylation in this work. They have been successfully applied for highly sensitive detection of Cu2+ in aqueous solution. The surface area per unit mass (S/M) ratio of the nanofibrous membranes was enhanced by incorporating the CNTs into cellulose. Moreover, the excellent metal ion sorption capability of the CNTs improved the sensitivity of the sensing materials. Both of the two points mentioned above significantly improved the lower detection limit of fluorescence sensing as expected. As the resultant byproduct of Cu2+-contaminated 1,4-DHAQ-doped CNTs@CL nanofibrous membranes showed recovered fluorescence by extra addition of Cr3+ in solution, 1,4-DHAQ and Cu2+ co-doped CNTs@CL (denoted as 1,4-DHAQ/Cu2+ co-doped CNTs@CL) microporous nanofibrous membranes were further fabricated for the fluorescence enhancement detection of Cr3+ in aqueous solution. It was found that the fluorescence intensity of the 1,4-DHAQ-doped CNTs@CL nanofibrous membranes linearly decreased with Cu2+ concentration in the range of 0–2.2 × 10−8 M, while that of the 1,4-DHAQ/Cu2+ co-doped CNTs@CL nanofibrous membranes linearly increased with Cr3+ concentration in the range of 0–2.4 × 10−8 M. The excellent fluorescence sensing properties of the 1,4-DHAQ-doped CNTs@CL and 1,4-DHAQ/Cu2+ co-doped CNTs@CL nanofibrous membranes for Cu2+ and Cr3+ were further demonstrated by using polluted lake waters, proving their potential applications in environmental monitoring areas. The design concept mentioned in this work might also open a door to the design of other effective fluorescence probes with high sensitivity.
研究领域:
环境科学
·
材料科学
·
分析化学
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高影响因子
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2021
·Vol. 98
·期 2
·389-400
·
IF 2.326
Liu Ting,Liu Qun,Liu Yuan,Yao Hang,Zhang Zhihua,Wang Xiaodong,Shen Jun
With SiO 2 gel as the main skeleton material, the surface modification with methyl acrylate (MA) and tetraethylenepentamine (TEPA) was carried out by Michael addition and substitution reaction, after CO 2 supercritical drying TEPA and MA modified SiO 2 aerogel (TEPA–MA–SA aerogel) was obtained. The sample exhibited selectivity and enormous adsorption capacities for Cu 2+ (218.57 mg g –1 ). The removal rate of Cu 2+ in ternary-mixed metal solution reached 49.29%, ranking first among the materials we have known. MA and TEPA both contain rich groups such as –NH 2 and –NH–, which provide abundant adsorption sites for adsorbing heavy metal ions. BET test showed that the specific surface area, the pore volume, and the pore diameter was 190.2 m 2 g −1 , 4.426 cm 3 g −1 and 9.306 nm respectively. The above properties facilitated capture for Cu (II). The adsorption data were fitted with Langmuir and Freundlich adsorption isotherm models, and both models could describe the adsorption process. However, according to the fitting parameters, Langmuir adsorption isotherm model explicates the adsorption process better. Although the pore structure and specific surface area are beneficial to the physical adsorption, chemical chelation still plays a major role. XPS analysis further proved the possible adsorption mechanism that N and O atoms adsorb Cu (II) ions through chelation. Altogether, TEPA–MA–SA aerogel is suitable as an auxiliary adsorbent to purify contaminated water.
研究领域:
材料科学
·
环境科学
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高影响因子
Journal of Materials Chemistry C
·
2018
·Vol. 6
·期 17
·4793-4799
·
IF 5.976
Yongfeng Liu,Xiaosheng Tang,Tao Zhu,Ming Deng,Iroegbu Paul Ikechukwu,Wei Huang,Guolu Yin,Yongzhong Bai,Dingrong Qu,Xianbin Huang,Feng Qiu
Pollution triggered by highly toxic heavy metal ions has become a worldwide issue of concern, and has aroused increasing research interest, but it is still a challenge to carry out its trace detection in the organic phase using inorganic fluorescent colloidal nanocrystals (NCs). Herein, we report fully inorganic CsPbBr3 perovskite quantum dots (PQDs), which were synthesized via a hot-injection method, as a fluorescent probe for the selective detection of copper ions in hexane. The photoluminescence (PL) intensity of CsPbBr3 PQDs is significantly quenched within several seconds after the addition of Cu2+ due to effective electron transfer from the PQDs to the added Cu2+, which is experimentally verified via analyzing absorption spectra and PL decay lifetime. The sensor, in turn-off mode, has a detection range from 0 to 100 nM with a limit of detection (LOD) as low as 0.1 nM, indicating great potential for practical applications. This study paves the way for PQD-based fluorescent probes for heavy metal detection in the organic phase.
研究领域:
环境科学
·
材料科学
·
分析化学
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