查找使用阿拉丁产品的科研文献

SPR effect and internal electric field in Pt@BiOBr/(001)-TiO2 S-scheme heterojunction for visible-light-driven photocatalytic degradation of tetracycline hydrochloride and dyes

Jie Yan,Jin Chen,Xiaofeng Yang,Yueying Wang,Xinle Wang,Jianye Shi,Jing Zhang,Yuzhao Ma,Yanjun Li

The photocatalytic destruction of contaminants in water, such as antibiotics and dyes, has emerged as a hot topic in environmental treatment. The 2D/2D BiOBr/(001)-TiO 2 S-scheme heterojunction , decorated with Pt, was fabricated through in-situ construction and photochemical deposition techniques and utilized to effectively eliminate tetracycline hydrochloride , rhodamine B , and methyl orange. 0.3 wt% has the highest degradation activity when exposed to visible light , and all TC-HCL degradation can be accomplished in 5 min. The photodegradation rate constants of BiOBr and BiOBr/(001)-TiO 2 are 15.3 and 6.3 times higher, respectively. Its satisfactory photocatalytic performance can be attributed to efficient interfacial charge separation, surface plasmon resonance (SPR) effect-induced broadening of the light absorption range, and enhanced migration and separation of photogenerated electron-hole pairs, as well as the formation of an S-scheme heterojunction with strong redox ability. Meanwhile, the larger heterogeneous interface of 2D/2D nanostructures offers efficient charge transfer channels and more reactive sites. Experiments involving electron spin resonance (ESR) and free radical capture demonstrated the generation of not only h + and O 2 − , but also more potent OH radicals. Furthermore, an effective S-scheme heterojunction carrier migration and degradation pathway was proposed based on the experimental results. This study proposes a novel concept for the production of S-scheme heterojunctions photocatalysts that are effective for wastewater pollutant degradation.

Electric Field-Enhanced SPR Sensors with AuNPs and CQDs for Rapid and Low-Detection-Limit Detection of Co2+

Xinyue Jing,Minxuan Chen,Xingye Ma,Xinrui Xu,Ning Wang,Kunpeng Niu,Xiaohan Chen,Yihao Wang,Jiayi Zhu,Jianguo Hou,Zhichao Wang

As a vital transition metal species, cobalt ions (Co2+) play a critical role in industrial and medical fields. However, uncontrolled release into ecosystems via industrial effluents presents significant environmental risks. To address this, a prism-coupled surface plasmon resonance (SPR) sensor chip was developed which enables simultaneous high sensitivity, wide detection range, and rapid detection of Co2+under ultra-low detection limit conditions. By depositing a 50 nm Au film and AuNPs on a glass substrate, and integrating carboxyl-functionalized carbon quantum dots (CQDs), the chip achieved the detection range of 10−20mol/L to 10−4mol/L, and the response time was reduced from 21 min to 11 min under optimal electric field conditions (1.2 V, 0.15 mol/L electrolyte concentration). The sensor exhibits high selectivity, repeatability, and stability. It can be integrated with optofluidic technology to enable high-throughput microfluidic analysis, thereby facilitating further advancements in related research.

A sensitive SPR biosensor based on hollow gold nanospheres and improved sandwich assay with PDA-Ag@Fe3O4/rGO

Shuo Li,Qiong Wu,Pinyi Ma,Yue Zhang,Daqian Song,Xinghua Wang,Ying Sun

A novel surface plasmon resonance (SPR) biosensor based on hollow gold nanospheres (HGNPs) and an improved sandwich assay was developed to detect rabbit IgG. The electromagnetic coupling between the HGNPs and Au film, and the notable plasmonic fields spread over the inner and outer surfaces of HGNPs, led to the considerable amplification of the SPR signal. [email protected] 3 O 4 /reduced graphene oxide ( [email protected] 3 O 4 /rGO) was introduced to bind detection antibody (Ab 2 ) to form the improved sandwich structure. Ag nanoparticles were excited to produce SPR and their hot electrons were doped on graphene thin films, which amplified the response of biomolecules. Magnetic nanoparticles (Fe 3 O 4 ) simplified the collection of Ab 2 [email protected] 3 O 4 /rGO. An external layer of polydopamine (PDA) permitted the efficient immobilization of Ab 2 without activation via abundant functional groups and protected the nanoparticles from etching or agglomeration. In addition, because of its large mass, Ab 2 [email protected] 3 O 4 /rGO also played a key role in the further amplification of the SPR response signals. This novel SPR biosensor exhibited an effective response to the rabbit IgG at the different concentrations ranging from 0.019 to 40.00   μg   mL −1 . This value is 132 times lower than that observed for a traditional SPR biosensor based on Au-3-mercaptopropionic acid and 8 times lower than that obtained from an Ab 2 sandwich assay, which indicates that the SPR sensor has high sensitivity. In addition, the designed biosensor showed satisfactory recoveries to detect the rabbit IgG spiked in serum samples. Therefore, the novel SPR biosensor with high sensitivity and acceptable recovery has potential for practical applications.

Dual modification based on electrostatic repulsion of bentonite and SPR effect of Bi facilitate charge transfer of Bi2WO6 for antibiotics degradation

Zhu Tingting,Hou Yanping,Huang Guofu,Fu Tian,Yang Jinhang,Wang Yutong,Zhang Hanbing

Development of efficient photocatalysts is vital for light-driven removal of refractory antibiotics. Herein, Bi 2 WO 6 microspheres were successfully anchored on the surface of bentonite, and metallic Bi was reduced in-situ by a one-step solvothermal method. Notably, the Bi/Bi 2 WO 6 /BT with a mass ratio of 0.15:1:0.1 exhibited the best photocatalytic activity toward degradation of tetracycline (TC) and ciprofloxacin (CIP) after 120 min of visible light irradiation, and their reaction rate constants were 8.0 and 5.5 folds higher than that of pristine Bi 2 WO 6 , respectively. The boosted photocatalytic activity over Bi/Bi 2 WO 6 /BT was ascribed to the establishment of electrostatic repulsion and SPR effect, which synergistically promoted charges transfer, thus achieving more h + and ·O 2 − radical generation. Moreover, possible TC and CIP degradation pathways over Bi/Bi 2 WO 6 /BT were proposed based on the identified intermediates, and most of the intermediates were less toxic than TC and CIP. The study provides options to develop high-efficiency photocatalytic composites for contaminants elimination using semiconductors and readily available bentonite.

Synergistic SPR and IEF effects in Pt-modified 2D/2D BiOBr/Bi2WO6 S-scheme heterojunction for ultrafast degradation of organic pollutants

Jin Chen,Jiayu Lei,Jie Yan,Yuzhao Ma,Xiaofeng Yang,Yanjun Li

The establishment of a surface plasmon resonance (SPR) effect and an internal electric field (IEF) has been recognized as an effective technique for optimizing pollutant treatment in aquatic environments. Herein, we synthesized a novel 2D/2D Pt@BiOBr/Bi 2 WO 6 S-scheme heterojunction that establishes robust interfacial connections to enhance electron transport through minimized pathways, while simultaneously increasing active site availability. Subsequently, noble metal Pt was employed to modify the BiOBr/Bi 2 WO 6 composite material, thereby inducing SPR and broadening the light absorption range. Impressively, the optimized Pt@BiOBr/Bi 2 WO 6 demonstrates a significantly enhanced degradation efficiency for organic pollutants, primarily due to the synergistic effects of SPR and IEF. The degradation rate of tetracycline hydrochloride (TC-HCL) through the ternary heterojunction 2-PBB can achieve 100 % within 30 min under 500 W of visible light irradiation, showcasing impressive cyclic stability. Furthermore, the developed photocatalyst also demonstrated remarkable degradation efficiency for organic dyes such as Rhodamine B (RhB) and methyl orange (MO). This work demonstrates an original approach to the fabrication of Pt-modified S-scheme heterojunction photocatalysts with high effectiveness.

3D hybrid arrayed Ag/MOF multi-plasmon resonant cavity system for high-performance SPR sensing

Yaru Li,Weihao Liu,Runcheng Liu,Jinjuan Gao,Jingwen Feng,Shicai Xu,Zhen Li,Shouzhen Jiang,Xuejian Du

The development of portable biosensors exhibiting outstanding performance for fast and convenient detection of human glucose levels takes on critical significance to human health testing. A two-dimensional metal-organic framework (Cu-TCPP 2D MOF)-sensitized arrayed resonant cavity silver film (ARC/Ag) optical fiber surface plasmon resonance (SPR) sensor was developed in this study. The ARC/Ag 3D structure overcame weak coupling and non-uniform plasmon resonance, and the resulting strong hotspots effectively extended the sensing region. Moreover, the coated MOF is considered as a prominent SPR sensitized layer for its plasmonic property and highly ordered structure. The results of the simulations confirmed the local electric field enhancement that was attributed to the plasmonic synergistic effect of MOF with ARC/Ag. The normalized transmission spectra were collected in ethanol solutions with the refractive index (RI) of 1.340 to 1.352, and the sensitivity and the figure of merit (FOM) of the sensor were demonstrated to be increased by 73.98% and 68%, respectively. The sensor exhibited a linear response factor of 9.99 nm/(mg/mL) over a glucose concentration range of 0.1–1.2 mg/mL by covalently immobilizing glucose oxidase (GOD) on MOF. Accordingly, the proposed highly integrated and portable biosensor provides a piece of promising evidence for label-free glucose detection at point of care (POC).

A lable-free SPR biosensor based on one peptide sequence with three recognition sites for O-GlcNAc transferase detection

Nan Yin,Ruihuan Zhao,Jie Zhang,Dingding Yang,Zhimin Guo,Rui Liu,Xin Yao

Abnormal O-linked N-acetylglucosamine (O-GlcNAc) concentrations have been associated with many diseases, but the lack of accurate detection method limited O-GlcNAc to be used as a biomarker in clinical diagnosis. Then O-GlcNAc transferase (OGT) has drawn researchers’ attention as it closed related to the level of O-GlcNAc and be considered to be a promising new target for diseases diagnosis. Nevertheless, the existing OGT detection methods are either need labeling or the sensitity can not meet the needs of clinic testing. Herein, a label-free and sensitive SPR biosensor was developed for accurate detection of OGT based on a multi-functional peptide. The designed peptide contains three recognition sites, one is the cleavage site of protease K, one is the O-GlcNAcylated site by OGT, and another is six histidine which be used as the signal report probe to recognize Ni 2+ . The immobilized peptide would be cleavaged by proteinase K, then the His-tag residue part will leave the surface of Au film, resulting less His-tag could bind to Ni 2+ and a small SPR signal would be record. If the peptide is O-GlcNAcylated by OGT, the cleaving reaction would be limited due to the adjacent site of O-GlcNAcylation. Then more His-tag can be left on the Au film and a bigger SPR signal could be record, this signal is associated with the concentration of OGT. Utilizing the change of the peptide configuration as a signal report probe for OGT detection not only avoids labeling of peptide, but also makes the method more sensitive. The determination linear range of OGT is from 2.00 × 10 −13 to 5.00 × 10 −8  M with a detection limit of 1.19 × 10 −13  M, and the separation of two enzyme reactions ensured the high selectivity of the method. Finally, the sensing system was successfully used for OGT detection in blood samples with satisfied recovery. In summary, the label-free SPR platform for accurate detection of OGT in real samples is helpful to promote OGT serve as a biomarker for early clinical diagnosis of O-GlcNAc related diseases.

Prism SPR Glucose Sensor Based on Gold Nanoparticle/Gold Film Coupling Enhanced SPR

Wu Fang,Liyun Ding,Yumei Zhang,Haijun Li

SPR-Enhanced Fluorescence of Solid Organic Dye Films

Qing Fu,Xiaolin Zhang,Peipei Yan,Shichao Wang,Xinzhi Wang,Yao Wang,Linjun Huang,Yanxin Wang,Haiyan Liu,Laurence A. Belfiore,Jianguo Tang

This paper presents strong fluorescence of spin-coated fluorescent solid organic dye films (SODF) enhanced by surface plasmonic resonance (SPR). In order to manifest the influence of SPR effect on enhancement of organic dye (OD) fluorescence, the organic dye embedded Ag@SiO2 fluorescent films were developed on the glass sheet substrate, in which Ag@SiO2 nanoparticles were embedded in the middle and organic dye was as upper layer. The morphology of the SODFs with and without Ag@SiO2 particles was studied by SEM and EDX, and the tests revealed that the Ag@SiO2 nanoparticles distributed evenly between glass sheet and OD layer. Optical properties were characterized by UV absorption and fluorescence spectroscopy; the lifetime of SODF was tested to discuss the mechanism of SPR enhancement of fluorescence. The results proved that the existence of Ag@SiO2 particles enhanced the fluorescence intensity for 7 times and thus proved the SPR effect for organic dye, especially when the organic dye is the solid films. Therefore, the most important is the creation that the SPR effect of Ag@SiO2 particles works very well under solid organic dye coverage.

All-Fiber SPR Microfluidic Chip for Arctigenin Detection

Yong Wei,Chunbiao Liu,Yonghui Zhang,Chen Shi,Yixiong Tang,Chunlan Liu,Yudong Su,Chen Wang,Yu Zhang,Zhihai Liu

A rapid preparation of PPECu and plasmonic Ag/PPECu nanocomposites with high performance for photocatalytic hydrogen production

Zhao Gao-yu,Le Meng-ting,Zeng Gui-ju,Zhang Yu,Li Jin-hai

A new and rapid synthetic method toward polymer phenylethnylcopper (PPECu) nanowires is developed. PPECu nanowires have been firstly fabricated through using ascorbic acid instead of methanol as reducing agent. The preparation time of PPECu can be decreased from 48 to 2 h, even at a lower temperature. Ag/PPECu nanocomposites were prepared by the in situ reaction of PPECu and Ag (NH 3 ) + 2 ions with different concentrations. Ag/PPECu photocatalysts showed high visible-light H 2 production activity, which originated from the combined action of electrons transfer, sacrificing reagent and SPR effect of Ag nanoparticles.

Real-time detection of mercury ions in environmental water conditions by using a differential phase SPR system equipped with a repeatable SPR chip

Yansheng Liu,Haoteng Wang,Guofu Wang,Xiaobo Jia,Jin Zhou,Hongqi Li,Haixin Chang,Zhicheng Jin,Kang Li,Zhaoxu Li

Contamination with heavy metal ions is one of the most widespread and harmful sources of environmental pollution. In this work, we developed a rapid, reproducible, and highly sensitive biosensor based on the surface plasmon resonance (SPR) effect to detect mercury ions (Hg 2+ ) in DI water, tap water, and rainwater. A homemade differential phase SPR biosensor was designed and constructed, with phase shifts in the SPR interference spectrum extracted using a windowed Fourier transform (WFT) method. Custom software was developed to extract the phase shift values of the SPR system in real-time. The sensing surface of the SPR system is an Au film functionalized with thymine-1-acetic acid (T-COOH), where the thymine group specifically binds to Hg 2+ , forming a stable T-Hg 2+ -T structure. By integrating a microfluidic chip with the sensing surface, the SPR system achieves a detection limit for Hg 2+ of 8.59 × 10 −4  mg/L in DI water, 7.26 × 10 −4  mg/L in tap water, and 8.82 × 10 −4  mg/L in rainwater, with excellent specificity compared to ions like Ca 2+ , Cd 2+ , Co 2+ , Cu 2+ , Fe 2+ , Mg 2+ , and Pb 2+ . Additionally, L-cysteine is used for the regeneration of the SPR sensor, which shows no significant loss of sensitivity after 40 cycles. Therefore, the differential phase SPR biosensor holds great promise for future applications in environmental monitoring, drinking water safety, and healthcare.