JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2011
·
IF 3.068
Jingpeng Yuan,Yongchao Lai,Junling Duan,Quanqin Zhao,Jinhua Zhan
A mono-6-thio-β-cyclodextrin-modified silver film was synthesized via galvanic displacement on copper foil. The prepared silver films could enrich non-polar polychlorinated biphenyls (PCBs) molecules from hydrophilic phase using thiolate β-cyclodextrins (SH-β-CDs) as receptors. The components of as-prepared Ag-coated-Cu (Ag–Cu) film were confirmed by powder X-ray diffraction (XRD). Both surface-enhanced Raman spectroscopy (SERS) and energy dispersive X-ray spectroscopy (EDS) measurements gave strong evidences that the thiolated β-cyclodextrins (SH-β-CDs) had been immobilized on the surface of silver film. Compared to the substrates prepared in the absence of SH-β-CD, the surface morphology of the CD-modified Ag films was obviously changed. The interfacial enrichment and the capability of substrates to form inclusion complexes with PCBs molecules were tested by using PCB-15 (4,4′-dichlorobiphenyl) as the probe molecules via SERS technique. The measured SERS spectra could distinguish the PCB-15 molecules at micro-molar level according to the most intense CCC bending in-plane mode of PCBs. The enhancement factor (EF) of the SERS substrates for PCB-15 was 1.2 × 10 5 , which was comparable with a number of previous reports.
研究领域:
分析化学
·
材料科学
✓ 已验证
DOI
高影响因子
Biomedical Optics Express
·
2018
·Vol. 9
·期 10
·4988-4997
·
IF 3.482
Yudong Lu,Changji Wu,Ruiyun You,Yang Wu,Huiying Shen,Lanjin Zhu,Shangyuan Feng
Superhydrophobic silver films were fabricated by silver-mirror reaction and surface functionalization with thiol. The thiol-functionalization significantly improved the hydrophobic property of the Ag films (AFS), and their contact angle values slightly increased with the extension of a thiol alkyl chain, reaching about 160°. The surface-enhanced Raman scattering (SERS) detection capacity of these films were investigated, and AFS-Dodec showed the best substrate for R6G molecule detection with the concentration limit of 10−11 M. AFS functionalized with dodecanethiol (AFS-Dodec) was applied for the SERS detection of uric acid and creatinine, it exhibited good linear dependence relationship between the Raman intensity and analyte concentration in the concentration range of 5~1000 μM.
研究领域:
分析化学
·
生物医学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
OPTICS AND LASER TECHNOLOGY
·
2024
·
IF 4.6
Shulei Li,Zhenxu Lin,Quantong Deng,Fu Deng,Mingcheng Panmai,Junying Chen,Yuheng Mao,Shimei Liu,Jun Dai,Yunbao Zheng,Rui Huang,Sheng Lan
Realization of long-term stable lasing from all-inorganic perovskite supercrystals is highly desirable for practical applications in optoelectronic devices. However, lasing from perovskite supercrystals excited by continuous wave laser light remains a challenge due to the photoluminescence degradation induced by thermal accumulation. Here, we report highly stable lasing with low threshold fom a CsPbClBr 2 supercrystal placed on a thin Ag film, which form a CsPbClBr 2 /Ag microcavity, by managing the thermal distribution inside the CsPbClBr 2 supercrystal. Combined numerical simulations and lifetime measurements, the localized electric field in such a hybrid microcavity leads to a spatially localized temperature distribution, which plays a crucial role in suppressing the thermal accumulation on the surface and in eliminating non-radiative recombination defects. The effective thermal management in the hybrid microcavity renders highly stable lasing with low threshold under the irradiation of continuouw wave laser light. Our findings provide a feasible and universal approach to the development of long-term stable perovskite laser.
研究领域:
光学工程
·
凝聚态物理
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材料科学
·
纳米光子学
·
激光技术
✓ 已验证
DOI
高影响因子
INORGANIC CHEMISTRY
·
2018
·
IF 4.7
Lei Ji,Xifeng Shi,Abdullah M. Asiri,Baozhan Zheng,Xuping Sun
Electrochemical reduction has been regarded as a sustainable strategy to tackle energy-intensive operations by the Haber–Bosch process achieving catalytic conversion of N2 to NH3 under mild conditions. However, the challenge of N2 electroconversion emphasizes the requirement of efficient electrocatalysts. In this paper, we report the development of porous bromide-derived Ag film (BD-Ag/AF) as an efficient electrocatalyst for N2 reduction reaction. During electrochemical test, Br– anions are released and adsorbed onto the surfaces of the electrode, suppressing hydrogen evolution reaction. Such BD-Ag/AF shows a high Faradaic efficiency of 7.36% at −0.6 V vs reversible hydrogen electrode in 0.1 M Na2SO4, which is higher than that (0.38%) of porous Ag film without Br– anions. Moreover, it exhibits excellent long-term electrochemical durability.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 17
·14105-14111
·
IF 3.289
Hua-Zhou Zhao,Yi Xu,Chun-Yan Wang,Rong Wang,Song-Tao Xiang,Li Chen
A “sandwich” microfluidic surface enhanced Raman scattering (SERS) chip with Ag film@nanoAu prepared in a microchannel was proposed and fabricated in situ. The integrated composite Ag film@nanoAu was prepared in situ by way of chemical plating and self-assembly. Firstly, the preparation conditions were optimized. On the basis of that, the influence of the laser focus position along the vertical direction and the materials of the cover plates on the SERS effect were investigated and optimized in detail. The optimized SERS effect was observed when the laser was focused on the interface of the sample and the SERS substrate. The SERS intensity of Rhodamine 6G (R6G) decreased 2.5 times and 2.1 times when PDMS or glass was used as the cover plate separately. Compared to single gold and silver SERS substrates, the composite of Ag film@nanoAu integrated in the microfluidic channel resulted in the peak intensity increasing 3–5 times during the SERS detection of R6G at 1507 cm−1. The enhancing effect could be attributed to the change in the local electromagnetic field which was caused by the synergistic sensitizing effect between the Au nanoparticles and the underlying silver mirror film. It was illustrated that the detection limit for R6G was 10−8 M and the enhancement factor (EF) was 3.8 × 105 with a relative standard deviation (RSD) of approximately 10% in the as-prepared microfluidic SERS chip.
研究领域:
分析化学
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纳米技术
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
ANALYST
·
2020
·Vol. 145
·期 8
·3009-3016
·
IF 3.978
Dechan Lu,Min Fan,Rongyuan Cai,Zufang Huang,Ruiyun You,Luqiang Huang,Shangyuan Feng,Yudong Lu
Dopamine (DA) is one of the catecholamine neurotransmitters used for the treatment of neural disorders. In this study, a novel sensor based on surface-enhanced Raman scattering (SERS) with dual molecule-recognition for ultrasensitive detection of DA was presented, with a limit of detection (LOD) of 40 fM, without any pretreatment of clinical samples. To realize the sensitive and selective detection of DA in complex samples, the nanoporous silver film (AgNF) surfaces were functionalized with mercaptopropionic acid (MPA) to accurately capture DA, while silver nanocubes (AgNCs) were modified with 4-mercaptobenzene boronic acid (4-MPBA) as a Raman reporter for the quantitative detection of DA. The nanogaps between AgNCs and the AgNF led to the generation of an abundance of hot spots for the SERS signal and thus effectively improved the sensitivity of DA detection. Measurements of DA concentrations in clinical body fluids such as human serum and urine samples are also demonstrated, showing excellent performance for DA detection in a complex environment. Our results demonstrate the promising potential for the ultrasensitive detection of DA for the potential diagnosis of DA-related diseases.
研究领域:
分析化学
·
生物传感器
·
纳米技术
·
神经科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
OPTICS EXPRESS
·
2024
·Vol. 32
·期 6
·9276-9286
·
IF 3.2
Shuya Ning,Shuya Ning,Zhihui Liu,Shuo Wang,Naming Zhang,Bin Yang,Xin Wang,Fanghui Zhang
All-inorganic halide perovskite quantum dots (QDs) have recently received much attention due to their excellent optoelectronic properties. And their emission properties still need to be improved for further applications. Here, we demonstrated a remarkable emission enhancement of the CsPbBr3 QDs based on an Ag nanoparticle-Ag film plasmonic coupling structure. Through precise control of the gap distance between Ag nanoparticle and Ag film, the localized surface plasmon resonance (LSPR) peak was tuned to match the emission wavelength of the CsPbBr3 QDs. We achieved a 30-fold fluorescence intensity enhancement and a lower lasing threshold, which is 25% of that of the CsPbBr3 QDs without plasmonic coupling structure. It is attributed to that the plasmonic coupling structure exhibits an extremely strong local electric field owing to the coupling between LSPR of Ag nanoparticle and surface plasmon polariton of Ag film. This work provides an effective way to enhance the optical emission of perovskite QDs and promotes the further exploration of on-chip light source.
研究领域:
材料科学
·
光学
·
纳米技术
·
光子学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nano-Micro Letters
·
2013
·Vol. 5
·期 3
·182-190
·
IF 2.057
Zhu Wen,Wu Yuanyuan,Wang Chengyin,Zhang Ming,Dong Guanxiu
The highly ordered silver-coated colloidal crystals arrays and macroporous silver films were derived through an electrostatics-induced adsorption effect using polystyrene (PS) as templates. Carboxyl-modified PS microspheres were prepared by emulsifier-free emulsion polymerization using methacrylic acid (MAA) as the functional monomer. PS microspheres were self-assembled into close packing colloidal crystals of facecentered cubic arrays to the substrate with vertical deposition method. These colloidal crystals were modified using dopamine (DA) to form poly-dopamine (PDA) during its oxidative polymerization. Through electrostatic interaction, the silver nanoparticles were deposited and adsorbed onto the surfaces of colloidal crystals templates by exposing [Ag(NH 3 ) 2 ] + solution to infrared irradiation. Removal of the polymeric template by etching with methylbenzene solvent resulted in 3D ordered macroporous silver films. The structural and properties of the ordered silver-coated arrays and macroporous silver films were characterized by field emission scanning electron microscopy (FE-SEM), X-ray diffraction (XRD), UV-vis spectroscopy and surface-enhanced Raman spectroscopy (SERS). The results indicate that the prepared silver-coated arrays and macroporous silver films possess the features of ordered multilayer arrangement, uniformity and repeatability as well as an ideal SERS effect.
研究领域:
材料科学
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纳米技术
·
物理化学
·
表面科学
·
分析化学
✓ 已验证
DOI
高影响因子
JOURNAL OF PHYSICS D-APPLIED PHYSICS
·
2021
·Vol. 54
·期 47
·475102
·
IF 3.207
Yi Jiang,Wenlin Feng,Xiaozhan Yang
A waist-enlarged taper Michelson interferometric trace fluoride-ion sensor based on silver film encapsulated the head face of thin-core fiber (TCF) is proposed and presented. The waist-enlarged taper is spliced between the single-mode fiber and the TCF to realize the optical splitter. The aluminium doped zinc oxide is coated on the outside surface of TCF as the fluoride-ion sensing membrane. Silver film on the head face of TCF is to enhance light reflection. The refractive index of the sensing membrane is changed by the adsorption of fluoride-ion, and then the monitoring interference dip of the sensor changes accordingly. Thus, the fluoride-ion concentration can be determined by the corresponding wavelength shift. The sensor can be used to detect trace fluoride-ion in the range of 0–50.0 ppb with an average sensitivity of 60.02 pm ppb−1. When the concentration is in the range of 0.01–0.10 ppb, the linearity is 0.998, and the sensitivity can be 3341.23 pm ppb−1. In the 0.3–2.0 ppb concentration range, the linearity is about 0.975, and the sensitivity can reach 404.75 pm ppb−1. As the concentration ranging from 5.0 to 50.0 ppb, the linearity is about 0.982 with the good sensitivity (23.75 pm ppb−1). The response time (about 40 s) of the sensor has been determined. The sensor has the advantages of high sensitivity, excellent selectivity, simple structure and rapid response, and can be put into the application for the trace fluoride-ion detection in water.
研究领域:
光学传感
·
光纤技术
·
环境监测
·
化学传感器
✓ 已验证
DOI
高影响因子
ANALYST
·
2025
·
IF 3.3
Yangyang Xu,Xiao-song Zhu,Yi-wei Shi
Mercury(II) ions (Hg2+) are one of the most common and highly toxic heavy metal ions, which can contaminate the environment and damage the human health. Therefore, the precise detection of trace Hg2+ concentration is particularly important. Herein, gold nanoparticles-enhanced silver-coated hollow fiber (HF) surface plasmon resonance (SPR) sensor was developed for the highly sensitive detection of Hg2+ ions. Due to the inherent difficulty in directly detecting Hg2+ ions on the sensing surface, the advantages of gold nanoparticles (AuNPs) as signal amplification labels were exploited to improve the sensitivity of the sensor. In the presence of Hg2+ ions, we chemically modified the sensing silver film of the sensor with 4-mercaptopyridine (4-MPY) and 4-mercaptopyridine-functionalized gold nanoparticles (AuNPs/4-MPY). Owing to the specific coordination between Hg2+ and the nitrogen of pyridine, Hg2+ could be captured by 4-MPY to form a Hg(pyridine)2 complex. After adsorption of the Hg2+ ions, the strong electromagnetic coupling between the AuNPs and the silver film led to a wavelength shift of the SPR resonance peak. Experiments for the detection of Hg2+ ions were performed in the concentration range of 5 nM to 1 μM to investigate the performance of the present sensor. The sensor achieved a limit of detection (LOD) as low as 5 nM. Moreover, the developed fiber sensor exhibited excellent performance in terms of sensitivity and repeatability. Our results show this strategy has widespread applications in the field of on-site heavy metal detection and biomedical monitoring.
研究领域:
分析化学
·
纳米技术
·
环境监测
·
生物传感器
·
光学传感器
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MEASUREMENT SCIENCE and TECHNOLOGY
·
2021
·Vol. 33
·期 3
·035102
·
IF 2.046
Sijie He,Yushan Liu,Wenlin Feng,Bangxing Li,Xiaozhan Yang,Xinyue Huang
A carbon monoxide (CO) sensor based on a Michelson interferometer combined with α-Fe2O3/reduced graphene oxide quantum dots (rGOQDs) composite film is proposed and fabricated. First, a waist-enlarged taper is formed between the single-mode fiber (SMF) and the no-core fiber (NCF), then the other end of the NCF is spliced with a section of thin-core fiber (TCF). The end of the TCF is coated with a layer of silver film to enhance the reflection. Thus, a Michelson interferometer comprising SMF–NCF–TCF is formed. The α-Fe2O3/rGOQDs composite film is deposited on the outside surface of the TCF. The specific adsorption of CO by the composite film leads to a change in the sensor's effective refractive index, realizing the detection of CO. The results show that the interference intensity of the monitoring valley decreases with increase in the concentration of CO. The sensitivity of the sensor is 0.057 dBm ppm−1, the detection limit of the sensor is 105 ppb and the response time and recovery time are 70 s and 100 s, respectively. The sensor has the advantages of high sensitivity, high selectivity and simple structure, and it is expected to be used for the detection of low concentrations of CO gas.
研究领域:
光学
·
材料科学
·
传感器
·
气体检测
✓ 已验证
DOI
高影响因子
OPTICS EXPRESS
·
2023
·Vol. 31
·期 4
·6203-6216
·
IF 3.8
Yuhao Chen,Cheng Li,Xiaozhan Yang
All fiber Michaelson interferometer cascaded fiber Bragg grating (FBG) sensor for simultaneous measurement of trace dimethyl methyl phosphate and temperature is proposed. One end of the four-core fiber (FCF) is spliced with a multimode fiber (MMF), the other end is flattened and evaporated with silver film to enhance reflection, and the Michelson interference structure is formed. The grating is engraved in the single-mode fiber (SMF) core and spliced with MMF, then the Michelson interference cascaded FBG, FBG-MMF-FCF sensor is obtained. The sensing film, MnCo2O4 is coated on the surface of FCF, and the structure, elemental composition and morphology of MnCo2O4 were analyzed by X-ray diffraction, X-ray photoelectron spectroscopy and scanning electron microscopy. The sensitivity and the detection limit of DMMP are 86.44 dB/ppm and 0.1767 ppb, respectively. The response/recovery time is about 14/10 s. the temperature sensitivity can be compensated and calculated as 0.069 nm/°C. The sensor has good selectivity and stability, and has a good application prospect in high sensitivity detection of trace DMMP vapor.
研究领域:
光学传感
·
化学传感
·
光纤技术
·
干涉测量
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）