Nature Communications
·
2020
·Vol. 11
·期 1
·1-7
·
IF 12.121
Zhou Chun,Zhong Yichi,Dong Hongxing,Zheng Weihao,Tan Jiqing,Jie Qi,Pan Anlian,Zhang Long,Xie Wei
Perovskites—compounds with the CaTiO 3 -type crystal structure—show outstanding performance in photovoltaics and multiparameter optical emitters due to their large oscillator strength, strong solar absorption, and excellent charge-transport properties. However, the ability to realize and control many-body quantum states in perovskites, which would extend their application from classical optoelectronic materials to ultrafast quantum operation, remains an open research topic. Here, we generate a cooperative quantum state of excitons in a quantum dot ensemble based on a lead halide perovskite, and we control the ultrafast radiation of excitonic quantum ensembles by introducing optical microcavites. The stimulated radiation of excitonic quantum ensemble in a superlattice microcavity is demonstrated to not be limited by the classical population-inversion condition, leading to a picosecond radiative duration time to dissipate all of the in-phase dipoles. Such a perovskite-assembly superlattice microcavity with a tunable radiation rate promises potential applications in ultrafast, photoelectric-compatible quantum processors.
研究领域:
材料科学
·
光学
·
量子物理
✓ 已验证
DOI
PubMed
高影响因子
ACS Sensors
·
2025
·
IF 9.1
Ruijie Wu,Ziyihui Wang,Yaoxin Fu,Junfeng Jiang,Yu-Cheng Chen,Tiegen Liu
Hydrogels have emerged as promising sensors for detecting heavy metal ions in fluids and have been extensively developed. However, monitoring of multiple target analytes in Chinese herbs remains challenging due to subtle chemical signals and the complex composition of the extracted solutions. To address these challenges, we developed a hydrogel optofluidic sensor to amplify analyte signals through strong light–matter interactions within the hydrogel. This sensing platform integrates a hydrogel film encapsulated in a whispering-gallery-mode (WGM) microcavity for the detection of heavy metal ions, such as Pb2+ and Hg2+. The 3D cross-linked hydrophilic polymer network facilitates ion penetration from analyte solutions, inducing distinct WGM resonance shifts. The red shift in the spectral wavelength serves as a parameter to quantify the content of heavy metal ions. By modification of the hydrogel with aptamers, the optofluidic sensors achieve high sensitivity and selectivity. Finally, the platform’s performance was demonstrated using Chinese herbs with varying Pb2+ concentrations, highlighting its practical applicability in real-world scenarios. The proposed hydrogel microcavity exhibit a promising method for development of functional hydrogel sensors and healthcare applications.
研究领域:
生物医学工程
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Xing Han,Xin Tang,Rifei Chen,Wei Li,Pingan Zhu,Liqiu Wang
We present a citrus-peel-like micro-cavity structure for the design of durable Slippery Liquid-Infused Porous Surfaces (SLIPSs). Owing to the re-entrant and enclosed nature of micro-cavity, lubricant oils can be stabilized by mitigating mass loss resulting from liquid displacement and shear drainage, respectively. Citrus-peel-like micro-cavity SLIPS displays two orders of magnitude enhancement in durability in the droplet-sliding test when compared with micro-pillar SLIPS and smooth lubricant surface. We demonstrated precise droplet manipulation without liquid loss and cross-contamination by harnessing the Marangoni effect with photo-thermal control. Cavity-smooth SLIPS with large adhesion contrast was patterned to initiate multiple droplet coalescences for on-demand neutralization reaction. The citrus-peel-like micro-cavity SLIPS would be beneficial to various applications, such as multi-step chemical reactions and bio-detections that require loss-free, contamination-free, and programmable droplet manipulation.
研究领域:
材料科学
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表面工程
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED MATERIALS
·
2021
·Vol. 34
·期 3
·2106502
·
IF 30.849
Jia-Xin Yu,Shuai Xing,Guang-Yu Dai,Shuang-Yi Ling-Hu,Fu-Xing Gu
Monolayer transition metal dichalcogenides (TMDs) have emerged as widely accepted 2D gain materials in the field of light sources owing to their direct bandgap and high photoluminescence quantum yield. However, the monolayer medium suffers from weak emission because only a single layer of molecules can absorb the pump energy. Moreover, the material degradation when transferring these fragile materials hinders their cooperation with the optical cavity further. In this study, for the first time, a high-quality monolithic structure is developed by directly growing single-domain tungsten diselenide (WSe 2 ) bilayers on single silica microsphere (MS) cavities. Such a completely wrapped structure guides the indirect-to-direct bandgap transition of WSe 2 bilayers, leading to a significantly improved photoluminescence intensity by about 60-fold. Moreover, the high-quality monolithic structure enhances the confinement factor of the cavity by more than 20-fold. Based on the above advantages, a bilayer WSe 2 /MS microlaser is realized with an ultralow threshold of 0.72 W cm −2 , nearly an order of magnitude lower than the existing records. The results demonstrate the possibility of using multilayer TMD materials as 2D gain media and provide insights into a new ultracompact monolithic platform of TMD material/cavity for lasing devices.
研究领域:
光学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2017
·
IF 5.401
Yan Wang,Liyuan Zhao,Aojie Xu,Lei Wang,Lingli Zhang,Shuangqiang Liu,Yongjun Liu,Hanyang Li
We report a liquid crystal (LC) microdroplet-based pH sensor and explore its application for detecting enzymatic reactions in penicillinase. Nematic LC 4-cyano-4'-pentylbiphenyl (5CB) microdroplet, doped with 4'-pentyl-biphenyl-4-carboxylic acid (PBA), is produced in phosphate buffer solution (PBS) with a tapered capillary microtube connected to a syringe pump. The PBA-doped 5CB microdroplets exhibit configuration transitions from bipolar to radial as PBS pH values increase from 5.7 to 6.0. These pH-induced changes in optical appearance are experimentally verified and attributed to the deprotonation of PBA at the aqueous/LC interface. We also examine the feasibility of the PBA-doped 5CB microdroplets as optical microcavities of whispering gallery modes (WGMs). Typical WGM lasing emission is observed in micrometer-sized microdroplets under a pulse laser pump. The WGM spectrum from the microdroplet responds to pH variations, reflecting as a spectral redshift as the pH decreases. The PBA-doped 5CB microdroplet can be successfully exploited accordingly for detecting enzymatic reactions in penicillinase. We demonstrate that the detectable shifts in WGM spectra associated with the microdroplet configuration transitions can serve as an indicator of the H + released from the enzymatic reaction.
研究领域:
生物化学
·
分析化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Nano-Micro Letters
·
2023
·Vol. 15
·期 1
·1-13
·
IF 26.6
Li Jiong,Duan Chenghao,Zhang Qianpeng,Chen Chang,Wen Qiaoyun,Qin Minchao,Chan Christopher C. S.,Zou Shibing,Wei Jianwu,Xiao Zuo,Zuo Chuantian,Lu Xinhui,Wong Kam Sing,Fan Zhiyong,Yan Keyou
Synergistic effect triggers the Ostwald ripening for the downward recrystallization of perovskite to form buried submicrocavities as light output coupler.
The simulation suggests the buried submicrocavities can improve the light out-coupling efficiency from 26.8% to 36.2% for near-infrared light.
Light-emitting diodes yields peak external quantum efficiency increasing from 17.3% at current density of 114 mA cm −2 to 25.5% at current density of 109 mA cm −2 and a radiance increasing from 109 to 487 W sr −1 m −2 with low rolling-off.
研究领域:
材料科学
·
光学工程
✓ 已验证
DOI
高影响因子
Advanced Materials Interfaces
·
2021
·Vol. 8
·期 15
·2100174
·
IF 6.147
Wenshuai Xu,Yu Liu,Boya Xiao,Heng Jiang,Meng Chen,Yuren Wang
Controllable wetting transition on artificial microtextured surfaces has significant applications in many industrial fields. In this work, the droplet spreading and the directional wetting transition are investigated on the substrate surface with the patterned microcavities. The results show that the macroscopic inward wetting transition from the periphery to the center of the droplet strongly depends on the mesoscopic sequential transition from Cassie to Wenzel state in the microcavities on the substrate surfaces. The semiquantitative relationship between sagging depth of meniscus in the microcavities and the droplet spreading velocity is set up by utilizing scaling-law analysis in terms of mechanical equilibrium of the meniscus. This finding is expected to help to clarify the issues on the mechanism and main affecting factors of the wetting transition on the patterned surface.
研究领域:
材料科学
·
表面工程
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry C
·
2024
·
IF 5.7
Bin Liu,Junhan Guo,Yang Tang,Liang Qin,Zhidong Lou,Yufeng Hu,Feng Teng,Yanbing Hou
Micro–nano organic–inorganic hybrid lead halide perovskites have become some of the most promising materials for optoelectronic applications due to their excellent photoelectric properties. The micro–nano scale laser device made using these materials would be an ideal light source for integrated photonics. The preparation methods of perovskite crystals grown via solution processing have improved a lot, but it is difficult to prepare discrete Fabry–Pérot (F–P) mode optical resonators with high-quality factor and small volume on the substrates due to random nucleation and excessive nucleation points. Hence, we used silver nanowires to induce the crystallization of perovskite crystallites, forming a perovskite/silver coupling structure and achieving an efficient laser. The directional distribution matrix of perovskite crystallites was obtained by adjusting the directional distribution of silver nanowires by using a controllable pulling method. By adjusting the concentration of the perovskite precursor solution, the aspect ratio of the crystallized perovskite microcrystals can be regulated, thus achieving the resonance modes of different perovskite microcavities. The results would open up an alternative approach to achieve controllable growth of perovskite crystallites.
研究领域:
材料科学
·
光学工程
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS LETTERS
·
2019
·
IF 3.019
Yongsheng Dong,Shengzhou Chen,Jialei Liu,Jinlong Lei,Fenggang Liu,Wei Yang,Jiahai Wang
In this study, the water-evaporation-induced assembly of a graphene oxide-ammonium metatungstate hydrate multilayer film was developed. After chemical reduction and high-temperature sulfurization, a graphene-WS 2 composite nanofilm with microcavities was obtained. When evaluated as an anode material in a lithium-ion battery, the graphene-WS 2 sample (precursor graphene oxide/WS 2 mass ratio of 1:4) exhibited high initial specific capacity (∼980 mAh g −1 at 0.1 A g −1 ), optimal cycling performance (∼450 mAh g −1 after 100 cycles at 0.1 A g −1 ), and superior rate capability (∼300 mAh g −1 at 2 A g −1 ). The graphene/WS 2 mass ratio influenced the contact between WS 2 and graphene and the porous nanofilm structure facilitated the kinetics of lithium-ion diffusion.
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 46
·期 37
·17958-17966
·
IF 3.925
Feng Chen,Shiming Wu,Jingjing Fu,Xiaohui Lv,Huihui Chai,Lixia Gao,Ling Yu
Polydimethylsiloxane (PDMS) gained its fame in the construction of microdevices for studying cell growth and cell–cell interaction and the assembly of organ-on-chip models because of its excellence in optical transparency, gas permeability, nontoxicity, elasticity, and well-developed soft lithography approaches. Yet, poor cell adhesion and growth on pristine PDMS drives the need to improve its cell compatibility. Herein, rough PDMS surfaces with microcavity structures were fabricated by one-step replication from a sandpaper template. The impact of physical topologies, such as microcavity size, density, and distribution, on cell anchoring and growth was systematically studied. Results show that sandpaper-templated, rougher PDMS can support significantly more cell growth than pristine, smooth PDMS. Most of the cells (80.27%) were observed at the microcavities replicated from sandpaper, suggesting the microstructure-trapped cells have increased chance of cell anchoring and growth. Moreover, the efficacy of the physical topology–enhanced cell compatibility was compared side-by-side with PDMS chemically functionalized with tannic acid (TA). The cell adhesion, growth, and apoptosis studies proved that sandpaper-templated PDMS has comparable efficacy to TA-functionalized smooth PDMS; both improved cell proliferation by ∼50% and reduced cell apoptosis. We also found that TA functionalization of the sandpaper-templated PDMS did not significantly improve the cell compatibility, suggesting that the simple one-step replication from sandpaper is a low-cost and effective way to prepare a PDMS surface for cell growth. Finally, the potential of sandpaper templating in building microdevices for cell culture is highlighted by assembling PDMS microchannels with rough surfaces for on-chip cell culture.
研究领域:
生物工程
·
细胞生物学
✓ 已验证
DOI
高影响因子
OPTIK
·
2015
·
IF 0.677
Hongyan Zhang,Zhenhong Jia,Xiaoyi Lv,Rong Wu,Peng Li,Jing Wang
The influence of permeable layer number of porous silicon microcavity (PSM) on the reflectance spectrum has been carried out from both simulations and experiments. The increase of the effective refractive index of the first porous silicon (PS) layer of PSM will causes a blue shift for the reflectance spectrum. With one more layer refractive index increasing, the blue shift becomes less, and it will shift to a higher wavelength when the layer number becomes large enough. This study would be helpful for simple fabrication of highly sensitive, fast responsible biosensors based on the blue shift of reflectance spectrum, and such fabricated Au/PSM substrate of multilayer PS might have a potential to detect minor biomolecules by means of surface state effects.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
IEEE SENSORS JOURNAL
·
2022
·Vol. 22
·期 19
·18273-18280
·
IF 4.325
Zhongwei Ma,Changwu Lv,Peng Li,Zhenhong Jia,Jierong Xie
Porous silicon (PSi) layers are prepared on the single-crystal silicon surface by electrochemical etching, and PSi membranes (PSiMs) are fabricated by separating the PSi layers from the single-crystal silicon substrate using high-current pulses. PSiMs have better adsorption and response time than nonseparated PSi layers, making them more suitable for sensing applications. PSi microcavity (PSM) structures are widely used for the detection of biomolecules in biosensors because of their high transmission resonance peaks with narrow full-width at half-maximum (FWHM) in the reflection spectra. However, when compared to PSiMs, the permeability of the PSM on the silicon substrate is low, resulting in a significant reduction in its detection sensitivity. In this study, an efficient self-supported Bragg stacked microcavity (SBSM) structure was prepared for the detection of DNA biomolecules by combining the advantages of PSM and PSiMs. The redshift of the reflectance spectra obtained in the concentration range of 0.1– $0.5 ~\mu \text{M}$ shows a good linear relationship, with a detection limit of 2.2 nM. The detection sensitivity is improved by more than a factor of ten when compared to the PSM structure on the silicon substrate. The novel device allows DNA biomolecules to enter the porous layers more easily, especially the defective layer, thus improving its detection sensitivity.
研究领域:
生物传感器
·
材料科学
·
分子生物学
✓ 已验证
产品关联
DOI
高影响因子
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