SENSORS
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2022
·Vol. 22
·期 13
·4816
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IF 3.847
Cheng Zhou,Yanjun Song,Qian Zhou,Jiajun Tian,Yong Yao
In this study, an ultra-high-sensitivity fiber humidity sensor with a chitosan film cascaded Fabry–Perot interferometer (FPI) based on the harmonic Vernier effect (HVE) is proposed and demonstrated. The proposed sensor can break the limitation of the strict optical path length matching condition in a traditional Vernier effect (TVE) FPI to achieve ultra-high sensitivity through the adjustment of the harmonic order of the HVE FPI. The intersection of the internal envelope tracking method allows spectra demodulation to no longer be limited by the size of the FSR of the FPI. The sensitivity of the proposed sensor is −83.77 nm/%RH, with a magnification of −53.98 times. This work acts as an excellent guide in the fiber sensing field for the further achievement of ultra-high sensitivity.Keywords:Fabry–Perot interferometer;chitosan film sensor;optical fiber humidity sensor;harmonic Vernier effect
研究领域:
光学
·
传感技术
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产品关联
DOI
PubMed
高影响因子
IEEE TRANSACTIONS ON NANOBIOSCIENCE
·
2026
·
IF 4.2
Wanlu Zheng,Weixin Kong,Na Zhang,Zhong Li,Ya-nan Zhang
reusable optical fiber surface plasmon resonance (SPR) sensor for quantitative detection of Pseudomonas aeruginosa is presented. To achieve repeatable measurement, this study used aptamer DNA as the functional monomer and polydopamine as the cross-linking agent to construct a molecularly imprinted nanofilm on the sensing surface. After elution treatment, molecularly imprinted cavities with high matching shape and size to the target molecule are formed in the nanofilm. Experimental results demonstrated that the sensors enhanced by molecular imprinting technology achieved an increase in resonance wavelength response from 10.677 nm to 24.98 nm, a reduction in response time from 22 minutes to 16 minutes, and an improvement in detection limit from 0.00985 OD to 0.00105 OD, compared with sensors only modified with functional monomers. Moreover, to address the problem of temperature interference in practical applications, a Fabry-Perot interferometer (FPI) is innovatively integrated. By taking advantage of the temperature sensitivity but bacterial insensitivity of FPI, the influence of temperature changes on SPR measurement is quantified, effectively providing temperature compensation and further improving the environmental adaptability of the sensor. This study provides a novel, reliable, and cost-effective detection solution for marine environmental microbial monitoring.
✓ 已验证
DOI
PubMed
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2022
·
IF 6.206
Yapeng Zheng,Kang Zhang,Yan Wang,Chao Ma,Zhou Gui
There has been a greatly extensive research interest in PMMA materials as alternatives to traditional glass. However, it remains tremendously challenging to integrate multiple functionalities into a PMMA material that can be diffusely applied to a flammable and complex scene. Herein, we fabricated a transparent, flame-retardant and high hardness coating based PMMA substrate through an in situ photo-polymerization by UV curing technology. The LOI test results showed that all coated PMMA obtained a good grade compared with pure sample, CPMMA-1 and CPMMA-4,5 can reach 24.5 and 24.0, respectively. The cone calorimeter experiment revealed that coated PMMA significantly enhanced fire safety, as the PHRR and THR values of CPMMA-1 were reduced by 48.6 % and 23.0 %, respectively. The FPI and FGI values of CPMMA-1 were 0.060 (m 2 ·s)/kW and 2.8 kW/(m 2 ·s) in comparison with 0.049 (m 2 ·s)/kW and 10.4 kW/(m 2 ·s) of pure PMMA. The large panel combustion test results revealed that CPMMA-1 and CPMMA-5 obtained the good fireproof property. Additionally, all coated PMMA achieved a satisfactory level about at least 3H and 3B level in hardness and adhesion test and were greatly improved compared with the pure sample. Furthermore, the coated PMMA can still maintain good transparency and visible light properties. Therefore, an innovative research idea and basis for the fabrication of flame-retardant PMMA materials are provided in this work. The manufacture of coated PMMA in this research provides a promising way and foresight into the design development for the next-generation of multifunctional fireproof PMMA materials.
研究领域:
材料科学
·
消防安全工程
·
高分子化学
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Xiaodong Jin,Xinyi Wu,Wufei Tang,Zheni Tan,Wanfu Wang,Shibing Sun
Layer by layer (LBL) self-assembly coatings upon expandable polystyrene (EPS) surface play an important role in improving its flame retardancy. However, a large number of layers is needed to achieve a satisfied fire performance, and the coatings are difficult to adhere on the inert EPS surface, resulting in the poor durability. In this work, the surface of EPS was activated by ultraviolet ozone (UVO) with the appearance of oxygen contained groups, then a LBL coating with only two bilayers (branched polyethyleneimine (BPEI)-kaolinite (kaol)-BPEI-diethylene triamine penta (methylene phosphonic acid)) was covalently connected on the EPS surface. Compared with neat EPS, the obtained E-K 5 D 30 sample increased the value of limiting oxygen index (LOI) from 18.8 % to 37.7 %, improved the ignition time from 59 s to 95 s, reduced the peak heat release rate (pHRR) value from 282.0 kW/m 2 to 220.9 kW/m 2 , and enhanced the char residues from 6.3 % to 32.3 % after the combustion. Moreover, an ultraviolet (UV) curing layer with P/N elements was prepared upon E-K 5 D 30 sample to maximize the flame retardant durability. A novel amino-intercalated kaol was used to play a smoke suppression role. The results showed that E-K* 5 D 30 -P 8 N 3 sample further increased the LOI to 39.2 %. Even after 12 h washing, the E-K* 5 D 30 -P 8 N 3 sample exhibited a slight LOI reduction to 37.8 %, and fire performance index (FPI) value of 0.405 m 2 ·s/kW, showing the successful construction of coatings with good fire safety and flame retardant durability.
研究领域:
材料科学
·
聚合物化学
·
消防安全工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）