OPTICAL FIBER TECHNOLOGY
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2024
·
IF 2.6
Ting Liu,Zhipeng Lin,Changfei Lai,Wei Guo,Shouyu Wang
To enhance the sensitivity of polydimethylsiloxane (PDMS)-based optical fiber surface plasmon resonance (SPR) temperature sensing probes, we propose a new prototype with a PDMS@Au sensing layer on the gold (Au) film of the multi-mode fiber (MMF)-single-mode fiber (SMF)-MMF heterojunction structure. This designed probe has improved the temperature sensitivity from −1.26 nm/°C (Au-PDMS) to −2.14 nm/°C (Au-PDMS@Au), maintaining good repeatability and stability. Moreover, the probe can be fabricated with simple procedures at a low cost. Therefore, this probe is a promising tool for temperature sensing in various applications.
研究领域:
光学工程
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传感器技术
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产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2017
·
IF 7.504
Xuejiao Wang,Xupeng Zhu,Yiqin Chen,Mengjie Zheng,Quan Xiang,Zhixiang Tang,Guanhua Zhang,Huigao Duan
Highly sensitive and low-cost surface-enhanced Raman scattering (SERS) substrates are essential for practical applications of SERS. In this work, we report an extremely simple but effective approach to achieve sensitive SERS detection of molecules (down to 10–10 M) by using a particle/molecule/film sandwich configuration. Compared to conventional SERS substrates which are preprepared to absorb analyte molecules for detection, the proposed sandwich configuration is achieved by postassembling a flexible transparent gel tape embedded with plasmonic nanoparticles onto an Au film decorated with to-be-detected analyte molecules. In such a configuration, the individual plasmonic gel tape and Au film have low or no SERS activity but the final assembled sandwich structure shows strong SERS signal due to the formation of numerous hot spots at the particle–film interface, where the analyte molecules themselves serve as both spacer and signal probes. Because of its simple configuration, we demonstrate that the proposed SERS substrate can be obtained over a large area with extremely low cost. Particularly, because of the on-demand nature and the flexibility, such a postassembly strategy provides an ideal solution to detect the pesticide residue on fruit surfaces with significantly enhanced sensitivity.
研究领域:
分析化学
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材料科学
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产品关联
DOI
PubMed
高影响因子
SENSORS
·
2017
·Vol. 17
·期 6
·1255
·
IF 2.677
Li Wang,Xiu-Mei Wan,Ran Gao,Dan-Feng Lu,Zhi-Mei Qi
A wavelength-interrogated surface plasmon resonance (SPR) sensor based on a nanoporous gold (NPG) film has been fabricated for the sensitive detection of trace quantities of benzo[a]pyrene (BaP) in water. The large-area uniform NPG film was prepared by a two-step process that includes sputtering deposition of a 60-nm-thick AuAg alloy film on a glass substrate and chemical dealloying of the alloy film in nitric acid. For SPR sensor applications, the NPG film plays the dual roles of analyte enrichment and supporting surface plasmon waves, which leads to sensitivity enhancement. In this work, the as-prepared NPG film was first modified with 1-dodecanethiol molecules to make the film hydrophobic so as to improve BaP enrichment from water via hydrophobic interactions. The SPR sensor with the hydrophobic NPG film enables one to detect BaP at concentrations as low as 1 nmol·L−1. In response to this concentration of BaP the sensor produced a resonance-wavelength shift of ΔλR= 2.22 nm. After the NPG film was functionalized with mouse monoclonal IgG1 that is the antibody against BaP, the sensor’s sensitivity was further improved and the BaP detection limit decreased further down to 5 pmol·L−1(the corresponding ΔλR= 1.77 nm). In contrast, the conventional SPR sensor with an antibody-functionalized dense gold film can give a response of merely ΔλR= 0.9 nm for 100 pmol·L−1BaP.Keywords:nanoporous gold film;surface plasmon resonance;benzo[a]pyrene;high sensitivity
研究领域:
分析化学
·
环境科学
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生物医学工程
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2018
·Vol. 29
·期 22
·19578-19587
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IF 2.324
Liu Chuanmei,Xu Jiangtao,Liu Zhengqin,Ning Xin,Jiang Shouxiang,Miao Dagang
In this study Ti/Ag/Ti tri-layer and Ti–Ag alloy films were deposited on the surfaces of polyethylene terephthalate (PET) fabrics by multi-target magnetron sputtering system to fabricate highly electro-conductive textiles. Before sputtering, the fabric was treated by polyacrylic acid ester (PA) to form a continuous surface on the surface of PET fabric by padding method. The as-fabricated fabrics were characterized by scanning electron microscopy, X-ray diffraction, and Fourier transform infrared spectrometer. And the physical properties of the coated fabrics were evaluated by electrical conductivity, contact angle (CA), flexibility and adhesion. At last, a simple electric circuit was made with the as-treated fabric to evaluate the electrical property and explore its application further. The results of the study revealed that pretreatment with PA could form a continuous film on the surface of PET fabric. The PA-coated PET fabric with Ti/Ag/Ti fabric exhibited excellent electrical property whose electrical resistivity was only 5.1 × 10 −7 Ω m, CA of 137°. The PA-coated PET fabric with Ti–Ag alloy film exhibited a rather lower electrical resistivity of 3.4 × 10 −7 Ω m, CA of about 130°. Moreover, the samples retain ideal flexibility and adhesion. Therefore this study can broaden the application area of magnetron sputtering on discontinuous surface to fabricate electrical conductive fabric. And due to the excellent electro-conductivity, this kind of fabric will be a promising material for smart textiles.
研究领域:
材料科学
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纺织工程
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表面工程
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产品关联
DOI
高影响因子
OPTICS EXPRESS
·
2022
·Vol. 30
·期 15
·26136-26148
·
IF 3.833
Haoyuan Cai,Haoyuan Cai,Haoyuan Cai,Haoyuan Cai,Mengwei Wang,Mengwei Wang,Mengwei Wang,Jing Liu,Jing Liu,Xiaoping Wang,Xiaoping Wang,Xiaoping Wang,Xiaoping Wang
A high-sensitivity surface plasmon resonance (SPR) sensor based on the coupling of Au grating and Au film is investigated through simulations and experiments. The SPR sensor is designed by using a hybrid method composed of genetic algorithm (GA) and rigorous coupled wave analysis (RCWA). The numerical results indicate the sensor has an angular sensitivity of 397.3°/RIU (refractive index unit), which is approximately 2.81 times higher than the conventional Au-based sensor and it is verified by experiments. Theoretical analysis, by finite-difference time-domain (FDTD) method, demonstrates the co-coupling between surface plasmon polaritons (SPPs) propagating on the surface of Au film and localized surface plasmons (LSPs) in the Au grating nanostructure, improving the sensitivity of the SPR sensor. According to the optimized structural parameters, the proposed sensor is fabricated using e-beam lithography and magnetron sputtering. In addition, the proposed sensor is very sensitive to the detection of small molecules. The limit of detection (LOD) for okadaic acid (OA) is 0.72 ng/mL based on an indirect competitive inhibition method, which is approximately 38 times lower than the conventional Au sensor. Such a high-sensitivity SPR biosensor has potential in the applications of immunoassays and clinical diagnosis.
研究领域:
生物传感器
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光学传感
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医学诊断
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产品关联
DOI
PubMed
高影响因子
JOM
·
2024
·
IF 2.1
Yu Yu,Li Ying,Zhong Yiwei,Wang Mingyong,Guo Zhancheng
Fe-Ni-Co alloy films demonstrate outstanding soft magnetic properties and are widely used as magnetic materials. The ultrasonic-assisted electrodeposition method is highly regarded for its merits in improving alloy film performance. In this study, Fe-Ni-Co alloy film with a uniform composition was fabricated through ultrasonic-assisted electrodeposition. The effects of the electrodeposition parameters on the composition and microstructure of the Fe-Ni-Co alloy films were studied. The results revealed that lower initial electrolyte pH, temperature ( T ), and ultrasonic power ( P ) were conducive to the increase of the iron content of the alloy films. As the ultrasonic power increased, the crystal structure of the Fe-Co-Ni films changed from bcc (FeCo) to fcc (NiFe), and the mean grain size decreased. When the electrodeposited condition was pH = 2, T = 50°C, and P = 45 W, the Fe 58.36 Ni 36.01 Co 5.63 alloy film showed a better corrosion resistance than 304 stainless steels. When the electrodeposited condition was pH = 2, T = 50°C, and P = 90 W, the Fe 53.84 Ni 41.66 Co 4.48 alloy film exhibited good magnetic properties, and the saturation magnetic induction and coercivity were 1.75 T and 85 A/m, respectively, which was much better than Fe-Co-Ni alloy films (Ni: about 40 wt.%) prepared by traditional electrodeposition.
研究领域:
材料科学
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电化学
·
冶金学
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产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2014
·
IF 5.9
Quanyao Yu,Zhixiang Zeng,Wenjie Zhao,Yongcun Ma,Xuedong Wu,Qunji Xue
Patterned hydrophobic Ni–P alloy films consisting of orderly and regular micro-nanoscale particles were fabricated through the synergistic effect of electrochemical deposition and chemical deposition. Ni–P alloy films were deposited for different times and characterized by scanning electron microscope (SEM). It was confirmed that the addition of reducing agent induced the formation of nanoscale particles, in contrast with pure Ni film deposited by single electrochemical deposition. As “point-discharge effect”, the current density was higher at the edge of the nanoscale particles, and Ni ions would be deposited at the particles through the “point-discharge effect”. Then the Ni–P alloy films grew by “reducing–discharging” process. The X-ray photoelectron spectroscopy (XPS) was used to detect the composition and valence states of these alloy films. The existence of oxidation state of element P in these films corresponding to that in H2PO3–, also gave direct evidence for the occurrence of chemical deposition, during the electrochemical deposition process. The prolongation of deposition time could provide more time for the patterned morphology to grow up. The surface roughness, evaluated by surface profilometer, increased as the deposition time extension. And these films showed gradually increased hydrophobic properties with the increase in deposition time.
研究领域:
材料科学
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表面工程
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DOI
高影响因子
ELECTROCHIMICA ACTA
·
2012
·
IF 3.832
Xiangheng Niu,Hongli Zhao,Chen Chen,Minbo Lan
In the present study the electrocatalytic behavior of platinum nanoparticle-decorated multi-walled carbon nanotube clusters vertically aligned on a screen-printed gold nanofilm electrode substrate (SPGFE/MWCNTC/PtNP) toward hydrogen peroxide was intensively investigated. Oriented multi-walled carbon nanotube clusters (MWCNTC) were firstly well-organized onto the screen-printed gold film electrode (SPGFE) surface by covalent immobilization, and then platinum nanoparticles (PtNPs) dispersed on the MWCNTC structure were in situ synthesized by electrochemically reducing chloroplatinic acid. It was demonstrated that the MWCNTC/PtNP hybrid structure on the SPGFE substrate could significantly enhance the electrochemical reduction of hydrogen peroxide in neutral solutions. Compared with platinum nanoparticles loading on disordered multi-walled carbon nanotubes (SPGFE/MWCNT/PtNP), the proposed SPGFE/MWCNTC/PtNP exhibited more sensitive responses for hydrogen peroxide reduction. The fabricated electrode provided linear current responses for hydrogen peroxide in the concentration range from 5 to 2000 μM with a detection limit of 1.23 μM. The non-enzymatic sensor also offered good reproducibility and high selectivity for hydrogen peroxide detection. The carbon nanotube cluster/platinum nanoparticle hybrid system holds great promise as a scaffold to fabricate enzyme biosensors.
研究领域:
材料科学
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生物医学工程
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电化学
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DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2024
·
IF 4.1
Qihu Wu,Wenchang Wang,Jiacheng Huang,Zhiyao Ming,Minxian Wu,Pengju Wang,Naotoshi Mitsuzaki,Zhidong Chen
Ga-Se alloy coatings were successfully electrodeposited at different deposition potentials from Deep Eutectic Solvent (choline chloride-ethylene glycol). The co-deposition mechanism of Ga and Se was investigated through cyclic voltammetry (CV) and chronoamperometry (CA). The results indicate that the co-deposition of Ga and Se occurs through an induced co-deposition mechanism, with Se deposition taking place initially, followed by the induced deposition of Ga. Furthermore, the Ga-Se co-deposition process was analyzed with the Scharifker-Hills model. The research results indicate that with the negative shift of the deposition potential, the Ga-Se co-deposition process gradually transitions from diffusion-controlled three-dimensional progressive nucleation and growth to three-dimensional instantaneous nucleation and growth. Characterization of the surface morphology and composition of the obtained coatings at different potentials was analyzed by scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDS). The results reveal that with the negative shift of the deposition potential, the morphology of the coating transforms from spherical to granular, and as the deposition potential continues to decrease, the granules further refine. Simultaneously, with the negative shift of the deposition potential, the relative content of Ga in the coating increases, while the relative content of Se decreases. The Ga-Se alloy coatings before and after annealing were characterized by X-ray diffraction spectroscopy (XRD). The results indicate that, after annealing, the coating exhibits the phase of GaSe. Besides, the optical and electrical properties of the annealed Ga-Se alloy coating were investigated by UV–visible spectroscopy and photoelectrochemical techniques. The results demonstrate that the coating exhibits excellent optical and electrical characteristics, with a photocurrent response of 0.014 mA/cm 2 , a bandgap of 1.98 eV, and p-type conductivity.
研究领域:
材料科学
·
电化学
·
表面科学
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DOI
高影响因子
APPLIED OPTICS
·
2019
·Vol. 58
·期 25
·6942-6948
·
IF 1.973
Shuang Liang,Chen Cai,Ran Gao,Mengying Zhang,Ning Xue,Zhi-mei Qi
A colorful surface plasmon resonance imaging (SPRi) sensor with the hue-based enhanced sensitivity has been developed by using sputtered AuAg alloy thin film as the sensing layer. The condition for optimizing the hue-based sensitivity of the SPRi sensor was achieved, that is, the initial resonance wavelength is in the range from 595 to 610 nm. Under this condition, the hue-based refractive index sensitivity of the SPRi sensor was measured as high as Δhue/Δnc=29879/RIU. This sensitivity is 8 times higher than that obtained with a gold-layer SPRi sensor (Δhue/Δnc=3658/RIU) and 7.7 times as high in magnitude as the spectral sensitivity of the same sensor (ΔλR/Δnc=3897.6 nm/RIU). After functionalization of the AuAg alloy film with the monoclonal antibody, the sensor was used for quantitative immunodetection of highly carcinogenic benzo[a]pyrene (BaP) in water. According to the experimental results, the average hue of the SPR color image (300 pixels×300 pixels) experiences an initial rapid increase and then stabilizes 15 min after exposure of the functionalized AuAg alloy film to an aqueous BaP solution sample. The variation of average hue obtained at the equilibrium of surface immunoreaction is a linear function of BaP concentration with the slope being Δhue/Δc=132.2/(μg·L−1). A cooled CCD camera is able to distinguish a change of Δhue=1, offering the colorful SPRi sensor the BaP detection limit of 0.01 μg·L−1. The comparative measurements of the sensor’s responses indicate that the hue variation obtained with 0.1 μg·L−1 of BaP is equal to that obtained either with 5 μg·L−1 of benzanthracene or with 5 μg·L−1 of benzofluoranthene, revealing the sensor’s excellent specificity to BaP. The work demonstrated that the AuAg alloy film-based colorful SPRi sensor can be used not only for visualized analysis of molecular interaction at the surface but also for quantitative trace detection of small-molecule analytes.
研究领域:
分析化学
·
环境科学
·
生物医学工程
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DOI
PubMed
高影响因子
Materials Science & Engineering C-Materials for Biological Applications
·
2020
·
IF 5.88
Ru-meng Yi,Zhe Zhang,Chun-xiu Liu,Zhi-mei Qi
In this study, we developed a gold‑silver alloy film based surface plasmon resonance (AuAg-SPR) sensor with wavelength interrogation to detect cancer antigen 125 (CA125) using a sandwich immunoassay. We first theoretically simulated the sensitivity of conventional gold film based SPR (Au-SPR) sensor and AuAg-SPR sensor, and conducted a series of experiments to investigate the sensitive characteristics of AuAg-SPR sensor, including the angle and refractive index (RI) sensitivity. We then conducted CA125 detection experiments on these two types of sensors. The results demonstrated that the limit of detection (LOD) of CA125 on the AuAg-SPR sensor was 0.1 U/mL (0.8 ng/mL) based on its direct reaction with an immobilised antibody, which was two orders of magnitude lower than that of the Au-SPR sensor (10 U/mL). The total changes in the resonance wavelength ( ∆λ R ) of the former were 1.7-fold those of the latter. The volume fractions of the adsorbates ( f ad ) and effective RIs ( n adlayer ) in each adlayer were then calculated and the effect of the antibody size on the detection results was analysed. The AuAg-SPR sensors had a higher sensitivity than the conventional Au-SPR sensors for detecting CA125 due to their electric field characteristics. Therefore, these will have better application prospects.
研究领域:
生物医学工程
·
传感技术
·
肿瘤标志物检测
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DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2017
·
IF 3.133
Xin He,Rongfei Wei,Xiangling Tian,Jianrong Qiu,Mei Zhang,Qingguang Zeng,Junyan Liu
Te-Bi 2 Te 3 alloy thin film has grown on silicon dioxide substrate by thermal evaporation technique. The Bi 2 Te 3 rhombohedral structure enriched Te in the prepared thin film was identified by high solution transmission electron microscopy (HRTEM), X-Ray diffraction (XRD), Raman spectrum and X-ray photoelectron spectroscopy (XPS). Interestingly, the Te-Bi 2 Te 3 alloy thin film presents a changeover from saturable absorption (SA) to reverse saturable absorption (RSA) as continuously increasing the input intensity, which has been investigated using the open-aperture (OA) z-scan measurement under a femtosecond-pulsed laser at 800 nm. A high modulation depth of 48.3% and large saturation intensity of 24.1GW/cm 2 of the thin film were obtained. Moreover, a large nonlinear absorption coefficient β of ∼10 3 cm/GW is increased with the input intensity elevated. The research results demonstrate that the Te-Bi 2 Te 3 alloy thin film could be an emerging optical material for saturable absorber in Q-switched or mode-locking fiber lasers at low incident intensity while serve as optical limiter at high incident intensity.
研究领域:
材料科学
·
凝聚态物理
·
光学工程
·
纳米材料
·
光电子学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）