Advanced Optical Materials
·
2021
·Vol. 9
·期 16
·2100166
·
IF 9.926
Yang Shen,Guanchu Wang,Qiushun Zou,Xiaoyi She,Da Cai,Chongjun Jin
Reliable and ultrasensitive humidity detection is essential in industrial process controls, meteorology, and medical diagnostics. In this study, a high-performance relative humidity (RH) sensor driven by a plasmonic-photonic hybrid system (PPHS), which supports waveguide modes and surface plasmon polariton mode simultaneously, is proposed. Due to the distinct sensitivities of these two modes to refractive index variation and volume expansion, the dual-mode RH detection platform offers a unique tool for isolating the individual contribution of each effect and further revealing the mechanism of moisture absorption in a crosslinked PVA film. As an RH sensor, PPHS delivers a wavelength sensitivity of 1.16 nm %RH −1 (40–70 %RH) and an intensity sensitivity of 1.1 dB %RH −1 (55–90 %RH), respectively. Benefited from such an ultrahigh sensitivity, together with excellent recyclability and a quick response time of a few seconds, the PPHS shows an almost identical real-time RH curve with an even higher resolution (<0.1 %RH) compared to a commercial electrical hygrometer in the practical ambient RH monitoring. The PPHS is further demonstrated as a human breathing sensor and a skin-humidity-based noncontact switch, suggesting that the PPHS provides a great potential in medical diagnostics and optical modulation.
研究领域:
光学传感
·
材料科学
·
医学诊断
✓ 已验证
产品关联
DOI
高影响因子
Nanoscale
·
2019
·Vol. 11
·期 30
·14322-14329
·
IF 6.97
Baosheng Du,Chengchun Tang,Dan Zhao,Hong Zhang,Dengfeng Yu,Miao Yu,Krishna C. Balram,Henkjan Gersen,Bin Yang,Wenwu Cao,Changzhi Gu,Flemming Besenbacher,Junjie Li,Ye Sun
Development of fluorescence enhancement (FE) platforms based on ZnO nanorods (NRs) has sparked considerable interest, thanks to their well-demonstrated potential in chemical and biological detection. Among the multiple factors determining the FE performance, high-order waveguide modes are specifically promising in boosting the sensitivity and realizing selective detection. However, quantitative experimental studies on the influence of the NR diameter, substrate, and surrounding medium, on the waveguide-based FE properties remain lacking. In this work, we have designed and fabricated a FE platform based on patterned and well-defined arrays of vertical, hexagonal prism ZnO NRs with six distinct diameters. Both direct experimental evidence and theoretical simulations demonstrate that high-order waveguide modes play a crucial role in FE, and are strongly dependent on the NR diameter, substrate, and surrounding medium. Using the optimized FE platform, a significant limit of detection (LOD) of 10−16 mol L−1 for Rhodamine-6G probe detection is achieved. Especially, a LOD as low as 10−14 g mL−1 is demonstrated for a prototype biomarker of carcinoembryonic antigen, which is improved by one order compared with the best LOD ever reported using fluorescence-based detection. This work provides an efficient path to design waveguiding NRs-based biochips for ultrasensitive and highly-selective biosensing.
研究领域:
纳米技术
·
生物光子学
·
生物传感器
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Advanced Energy Materials
·
2021
·Vol. 11
·期 29
·2100742
·
IF 29.368
Qian Song,Yang Wang,Florian Vogelbacher,Yan Zhan,Danlei Zhu,Yangjie Lan,Wenzhong Fang,Zemin Zhang,Lang Jiang,Yanlin Song,Mingzhu Li
Perovskite (PVK) photodetectors (PDs) have emerged as highly-efficient versatile optoelectrical devices due to their highly efficient and simple solution-processable preparation method. Meanwhile, optical structures offer an efficient and facile strategy to improve the light-harvesting performance of devices and introduce extra optical activity such as polarization sensitivity. Here, an efficient moiré perovskite photodetector with a stacked dual shallow grating structure is designed and fabricated, and sensitive digital polarization imaging is realized. The moiré PVK presents superior ability in light harvesting through the synergistic effects of feedback reflection, diffraction, and excitation of waveguide modes in the dual grating structure. Additionally, the highly crystalline PVK is fabricated through the imprint lithography process. Consequently, excellent device performance is achieved by taking advantage of highly-efficient light-harvesting and the good electrical properties of large grain PVK crystals. The responsivity (R) and detectivity (D*) of the moiré PVK PD are up to 15.62 A W and 5.58 × 10 13 Jones, which are 6.7 and 7.8 times larger than that of the flat perovskite photodetector, respectively. The on/off ratio reaches 2.7 × 10 4 . The nanograting array introduces good polarization sensitivity to the moiré PVK PD achieving a peak-to-valley ratio of 1.58. Excellent polarization images are obtained using a 576 pixel sensor array.
研究领域:
光电子学
·
纳米光子学
·
材料科学
·
传感器技术
·
光学工程
·
半导体器件
✓ 已验证
DOI
高影响因子
BIOSENSORS & BIOELECTRONICS
·
2023
·
IF 12.6
Hong Zhang,Chenggang Zhang,Zhaotong Wang,Wenwu Cao,Miao Yu,Ye Sun
Sensitive and anti-interference detection of targeted signal(s) in body fluids is one of the paramount tasks in biosensing. Overcoming the complication and high cost of antibody/aptamer-modification, surface-enhanced Raman spectroscopy (SERS) based on antibody/aptamer-free (AAF) substrates has shown great promise, yet with rather limited detection sensitivity. Herein, we report ultrasensitive and anti-interference detection of SARS-CoV-2 spike protein in untreated saliva by an AAF SERS substrate, applying the evanescent field induced by the high-order waveguide modes of well-defined nanorods for SERS for the first time. A detection limit of 3.6 × 10 −17 M and 1.6 × 10 −16 M are obtained in phosphate buffered saline and untreated saliva, respectively; the detection limits are three orders of magnitude improved than the best records from AAF substrates. This work unlocks an exciting path to design AAF SERS substrates for ultrasensitive biosensing, not limited to detection of viral antigens.
研究领域:
生物传感
·
医学诊断
·
纳米技术
·
病毒学
✓ 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）