- 标题
- 摘要
- 关键词
- 实验方案
- 产品
-
Clinical performance of clinical-visual examination, digital bitewing radiography, laser fluorescence, and near-infrared light transillumination for detection of non-cavitated proximal enamel and dentin caries
摘要： The aim of this study was to compare the clinical performance of clinical-visual examination using the International Caries Detection and Assessment System (ICDAS) II, digital bitewing radiography, near-infrared light transillumination (NIR-LT), and laser fluorescence (LF) for the detection of non-cavitated proximal enamel and dentin caries. The study included 335 patients, aged 12–18 years, with no cavities in the posterior teeth. Clinical-visual inspections of 335 non-cavitated proximal caries were performed by two examiners. For enamel caries, clinical validation included a combination of clinical-visual and digital bitewing radiography assessments. For dentin caries, the clinical validation was opening the cavity. The accuracy rate, sensitivity, specificity, predictive values, and areas under receiver operating characteristic curves were determined. The agreement between the examiners’ measurements was calculated using the kappa coefficient. The sensitivity, specificity, and accuracy of the methods were compared using the McNemar test. The significance level was set at p < 0.05. Digital bitewing radiography had the highest sensitivity (0.96) and accuracy (0.96), and LF had the lowest sensitivity (0.38) and accuracy (0.39). After separation of the lesions into enamel and dentin caries, clinical-visual examination had the highest sensitivity (0.98) and accuracy (0.98) for enamel caries, while digital bitewing radiography had the highest sensitivity (0.97) and accuracy (0.97) for dentin caries. The NIR-LT method had a higher sensitivity for enamel caries (0.86). Each method also differed significantly from the others (p < 0.001). Digital bitewing radiography gave the best prediction of proximal enamel and dentin caries. NIR-LT showed good potential for detection of proximal caries.
关键词： Laser fluorescence,Non-cavitated caries,Near-infrared light transillumination,Proximal caries,Caries detection
更新于2025-09-23 15:19:57
-
Light Confinement Effect Induced Highly Sensitive, Self‐Driven Near‐Infrared Photodetector and Image Sensor Based on Multilayer PdSe <sub/>2</sub> /Pyramid Si Heterojunction
摘要： In this study, a highly sensitive and self-driven near-infrared (NIR) light photodetector based on PdSe2/pyramid Si heterojunction arrays, which are fabricated through simple selenization of predeposited Pd nanofilm on black Si, is demonstrated. The as-fabricated hybrid device exhibits excellent photoresponse performance in terms of a large on/off ratio of 1.6 × 105, a responsivity of 456 mA W?1, and a high specific detectivity of up to 9.97 × 1013 Jones under 980 nm illumination at zero bias. Such a relatively high sensitivity can be ascribed to the light trapping effect of the pyramid microstructure, which is confirmed by numerical modeling based on finite-difference time domain. On the other hand, thanks to the broad optical absorption properties of PdSe2, the as-fabricated device also exhibits obvious sensitivity to other NIR illuminations with wavelengths of 1300, 1550, and 1650 nm, which is beyond the photoresponse range of Si-based devices. It is also found that the PdSe2/pyramid Si heterojunction device can also function as an NIR light sensor, which can readily record both “tree” and “house” images produced by 980 and 1300 nm illumination, respectively.
关键词： optoelectronic devices,near-infrared light,light manipulation,black silicon,2D materials
更新于2025-09-19 17:13:59
-
Reconfigurable Surface Plasmon Resonance Photodetector with a MEMS Deformable Cantilever
摘要： Plasmonic photodetectors have many useful characteristics, such as wavelength- or polarization-specific photodetection. Although reconfigurable plasmonic structures have been intensively studied, reconfiguration of the optical characteristics of a plasmonic photodetector has not yet been reported. Here, we report a gold diffraction-grating-type plasmonic photodetector that reconfigures its optical characteristics with a MEMS deformable cantilever. By reconfiguring the photodetector characteristics using an angular scan of the cantilever over ?21 ~ 21 degrees, the peak shifts of the photocurrent signal waveform are found to depend on the wavelength over 1200 nm ~ 1500 nm, which is consistent with SPR theory. The proposed reconfigurable plasmonic photodetector allowed us to obtain spectroscopic information of the light in a demonstration experiment.
关键词： Schottky-barrier,Surface Plasmon Resonance,MEMS,Near-infrared light,Spectrometer,Photodetector
更新于2025-09-19 17:13:59
-
Organic blue-colored D-A-??-A dye-sensitized TiO2 for efficient and stable photocatalytic hydrogen evolution under visible/near-infrared-light irradiation
摘要： Photocatalytic splitting of water by titanium dioxide (TiO2) is considered as the most promising approach for the production of hydrogen fuel. However, a low utilization of the solar light spectrum still limits its photoconversion efficiency. Herein, two indeno[1,2-b]thiophene-based organic sensitizers (S5 and S6) are used to sensitize TiO2 to significantly enhance photocatalytic hydrogen production by broadening the spectral response to near-infrared-light region. The results revealed that the average H2 evolution rates of S5@Pt/TiO2 and S6@Pt/TiO2 were 21.5 mmol g-1 h-1 and 7.2 mmol g-1 h-1 , which were 11.3 and 3.9 fold than that of the Pt/TiO2 (1.85 mmol g-1 h-1), respectively. Compared with donor-π-acceptor (D?π?A) dye S6, donor?acceptor?π?acceptor (D-A-π-A) blue-colored dye S5 possesses evident dominant in sensitizing TiO2, in which the auxiliary acceptor 2,3-diphenylquinoxaline (QT) of S5 can effectively disperse donor electron distribution to improve the photo-stability and weak the deprotonation effect to enhance light-harvesting. More importantly, a highly apparent quantum efficiency (AQY) of 2.8% for S5@Pt/TiO2 was obtained at λ = 700 nm monochromatic light, which is, to the best of our knowledge, a recorded value among the pure organic dye-sensitized TiO2 systems. This study offers important insights into the rational design of D-A-π-A organic dye to sensitize TiO2 for highly efficient and stable photocatalytic hydrogen evolution.
关键词： Near-infrared light,Photocatalytic H2 production,D-A-π-A,Blue dye
更新于2025-09-19 17:13:59
-
Neuron-like cell differentiation of hADSCs promoted by a copper sulfide nanostructure mediated plasmonic effect driven by near-infrared light
摘要： Nerve is one of the most difficult tissues to repair due to the limited source of neural stem cells and the difficulty to promote the neural differentiation of mesenchymal stem cells by growth factors. Electromagnetic field has been proved to have the ability to regulate stem cells differentiation. Although some researches promoted neural differentiation of stem cells by external power source, it is still a big challenge to realize the nerve repair in bodies because of the unwieldiness and complexity of the power supply equipment. Surface plasmon (SP) is electromagnetic oscillation caused by the interaction of free electrons and photons on metal surface, and almost no one has used this localized electromagnetic oscillation to regulate stem cells differentiation. In this study, based on the concept proposed by our group that “Regulation of stem cell fate by nanostructure mediated physical signal”, the localized electromagnetic oscillation generated by the localized surface plasmon resonance (LSPR) of copper sulfide (CuS) nanostructure irradiated by near-infrared light has been proved to have positive regulation on stem cell maturation and neuron-like cell differentiation of human adipose-derived stem cells (hADSCs). This regulation method avoids the use of wire connection of external power source, which realizes the stem cell fate regulation by external field. In addition, this work demonstrated that it is promising to realize the light promoted nerve repair in bodies by using implantable plasmonic nanomaterial with absorption in near-infrared region within human “optical window”, which has important academic value and application prospect. As we know, this is the first time to use semiconductor nanostructures as a medium to regulate stem cells neuron-like cell differentiation by near-infrared light and LSPR of plasmonic nanomaterial, which will have great influence on biomedical engineering and attract broad attention from nanomaterials scientist, neurobiologist, and neurosurgeon.
关键词： neuron-like cell differentiation,plasmonic effect,near-infrared light,hADSCs,copper sulfide nanostructure
更新于2025-09-19 17:13:59
-
Translation of a photovoltaic retinal prosthesis
摘要： A silicon-based photovoltaic subretinal prosthesis triggers behavioural responses to pulsed near-infrared light in awake macaques.
关键词： silicon-based,photovoltaic retinal prosthesis,macaques,near-infrared light
更新于2025-09-19 17:13:59
-
Plasmon enhanced up-conversion nanoparticles in perovskite solar cells for effective utilization of near infrared light
摘要： As an alternative to silicon-based solar cells, organic–inorganic hybrid perovskite solar cells (PSCs) have attracted much attention and achieved a comparable power conversion e?ciency (PCE) to silicon-based ones, although the perovskite materials can absorb only visible light. Hence, the challenge remains to enhance the PCE utilizing near infrared (NIR) light in the solar light spectrum. One of the easiest ways to utilize the NIR is to incorporate NIR active materials in PSCs such as up-conversion nanoparticles (UCNPs); however, such a stratergy is not simple to adopt in PSCs due to the inherent vurnerability of perovskite materials towards moisture. In this work, we present NIR-utilizing PSCs by locating UCNPs within the PSC structure by a simple dry transfer method. A maximum PCE of 15.56% was obtained in the case of PSC having the UCNPs located between the hole transport layer (HTL) and gold (Au) top electrode, which is an 8.4% enhancement compared to the cell without the UCNPs. This enhancement came from the combined e?ects of NIR light utilization and the surface plasmon resonance (SPR) phenomenon originating from the Au top electrode, which was interfacing the UCNPs.
关键词： up-conversion nanoparticles,dry transfer method,perovskite solar cells,near infrared light,surface plasmon resonance
更新于2025-09-16 10:30:52
-
<i>Rhodopseudomonas palustris</i> -based conversion of organic acids to hydrogen using plasmonic nanoparticles and near-infrared light
摘要： The simultaneous elimination of organic waste and the production of clean fuels will have an immense impact on both the society and the industrial manufacturing sector. The enhanced understanding of the interface between nanoparticles and photo-responsive bacteria will further advance the knowledge of their interactions with biological systems. Although literature shows the production of gases by photobacteria, herein, we demonstrated the integration of photonics, biology, and nanostructured plasmonic materials for hydrogen production with a lower greenhouse CO2 gas content at quanti?ed light energy intensity and wavelength. Phototrophic purple non-sulfur bacteria were able to generate hydrogen as a byproduct of nitrogen ?xation using the energy absorbed from visible and near-IR (NIR) light. This type of biological hydrogen production has su?ered from low e?ciency of converting light energy into hydrogen in part due to light sources that do not exploit the organisms' capacity for NIR absorption. We used NIR light sources and optically resonant gold–silica core–shell nanoparticles to increase the light utilization of the bacteria to convert waste organic acids such as acetic and maleic acids to hydrogen. The batch growth studies for the small cultures (40 mL) of Rhodopseudomonas palustris demonstrated >2.5-fold increase in hydrogen production when grown under an NIR source (167 (cid:1) 18 mmol H2) compared to that for a broad-band light source (60 (cid:1) 6 mmol H2) at equal light intensity (130 W m(cid:3)2). The addition of the mPEG-coated optically resonant gold–silica core–shell nanoparticles in the solution further improved the hydrogen production from 167 (cid:1) 18 to 398 (cid:1) 108 mmol H2 at 130 W m(cid:3)2. The average hydrogen production rate with the nanoparticles was 127 (cid:1) 35 mmol L(cid:3)1 h(cid:3)1 at 130 W m(cid:3)2.
关键词： organic acids,near-infrared light,plasmonic nanoparticles,hydrogen production,Rhodopseudomonas palustris
更新于2025-09-16 10:30:52
-
Full-Spectrum Photocatalytic Activity of ZnO/CuO/ZnFe2O4 Nanocomposite as a PhotoFenton-Like Catalyst
摘要： Deriving photocatalysts by the calcination of hydrotalcite-like compounds has attracted growing interest for extending their photocatalytic activity to the visible and even near-infrared (NIR) light regions. Herein, we describe the acquisition of a ZnO/CuO/ZnFe2O4 nanocomposite with good photoFenton-like catalytic activity under UV, visible and near-infrared (NIR) light irradiation by optimizing the calcination temperature of the coprecipitation product of Zn2+, Cu2+ and Fe3+. The ZnO/CuO/ZnFe2O4 nanocomposite is composed of symbiotic crystals of ZnO, CuO and ZnFe2O4, which enable the nanocomposite to show absorption in the UV, visible and NIR light regions and to produce a transient photocurrent in the presence of H2O2 under NIR irradiation. The full-spectrum photoFenton-like catalyst shows improved performance for the degradation of methyl orange with an increasing amount of H2O2 and is very stable in the recycling process. We believe that the ZnO/CuO/ZnFe2O4 nanocomposite is a promising full-spectrum photoFenton-like catalyst for the degradation of organic pollutants.
关键词： ZnO/CuO/ZnFe2O4,photodegradation,Full-spectrum,nanocomposite,photoFenton-like catalyst,near-infrared light,photocatalysis
更新于2025-09-10 09:29:36
-
Zebrafish larvae show negative phototaxis to near-infrared light
摘要： Zebrafish larvae (Danio rerio) are among the most used model species to test biological effects of different substances in biomedical research, neuroscience and ecotoxicology. Most tests are based on changes in swimming activity of zebrafish larvae by using commercially available high-throughput screening systems. These systems record and analyse behaviour patterns using visible (VIS) and near-infrared (NIR) light sources, to simulate day (VIS) and night (NIR) phases, which allow continuous recording of the behaviour using a NIR sensitive camera. So far, however, the sensitivity of zebrafish larvae to NIR has never been tested experimentally, although being a critical piece of information for interpreting their behaviour under experimental conditions. Here, we investigated the swimming activity of 96 hpf (hours post fertilization) and 120 hpf zebrafish larvae under light sources of NIR at 860 nm and at 960 nm wavelength and under VIS light. A thermal source was simultaneously presented opposite to one of the light sources as control. We found that zebrafish larvae of both larval stages showed a clear negative phototactic response towards 860 nm NIR light and to VIS light, but not to 960 nm NIR light. Our results demonstrated that zebrafish larvae are able to perceive NIR at 860 nm, which is almost identical to the most commonly used light source in commercial screening systems (NIR at 850 nm) to create a dark environment. These tests, however, are not performed in the dark from the zebrafish′s point of view. We recommend testing sensitivity of the used test organism before assuming no interaction with the applied light source of commonly used biosensor test systems. Previous studies on biological effects of substances to zebrafish larvae should be interpreted with caution.
关键词： Zebrafish larvae,near-infrared light,high-throughput screening systems,negative phototaxis,behavioral response
更新于2025-09-09 09:28:46