一种基于氢氧反应热的催化氧气传感器

基于对氢氧反应热的测量 ,设计了1种测量气体中微量氧气含量的传感器 ,它由嵌入反应池的微型薄膜铂电阻 ,氧化锰 -钯催化剂构成 ,铂电阻构成惠斯顿电桥 ;在催化剂作用下 ,氢氧反应放热使反应池内温度升高 ,引起铂电阻值变化 ,使电桥偏移产生响应信号 ;采用直通全消耗微反应池 ,待测氧气可被完全利用 ,使用参比池和恒温装置减小环境温度和湿度波动影响 ;设计的传感器对1～1200×10 -6(w)的氧气呈线性响应 ,定量下限为1×10-6(w) ,90%信号响应时间小于5s;该传感器具有结构简单、响应迅速、灵敏度高、稳定性好等特点。     

荧光化学传感器的研究进展

从荧光指示剂的设计原理、固定方法及传感器材料三方面,对荧光化学传感器近年来的进展作了评述,特别是对一些新型荧光化学传感器的应用及纳米传感新材料的发展作了重点介绍。此外,对荧光化学传感器的发展前景作了展望。     

Hummingbird传感技术公司即将推出新氧气传感器

Hummingbird传感技术公司即将推出Paracube Micro氧气传感器，该产品将为重症监护医疗应用的氧气传感器建立崭新的标准。新型传感器尺寸紧凑、性能出众，其设计精神旨在为OEM氧气传感器应用提供独特的系统集成性、灵活性、兼容性以及可靠性。     

半胱氨酸传感器的研究进展

半胱氨酸(Cys)作为人体中一种不可缺少的氨基酸,对维持蛋白质功能和新陈代谢等方面起着重要作用,因此半胱氨酸的检测与传感器的开发也显得十分重要。本文综述了近些年来半胱氨酸传感器的研究进展,对半胱氨酸电化学传感器、比色传感器以及荧光传感器等的研制与应用方面进行了阐述和评价,并对半胱氨酸传感器的发展前景进行了展望。     

分子印迹荧光传感器研究进展

分子印迹技术是结合高分子化学、分析化学、材料科学等发展起来的一门边缘学科,是模拟受体-抗体相互作用的一种新技术。分子印迹荧光传感器结合了分子印迹聚合物的预定识别性和高选择性以及荧光检测的高灵敏性,成为传感领域的研究热点。本文主要介绍了分子印迹荧光传感器的研究进展,重点概述了分子印迹荧光传感器的制备原理、检测方式及其在有机小分子和离子检测中的应用,并对其发展前景进行了展望。     

功能化核酸适配子传感器的研究进展

适配子生物传感器由于其检测灵敏度高、选择性好并具有良好的稳定性和广泛的适用范围等一系列优点在近年来得到了迅速发展,极大地促进了生物传感器的快速发展。本文主要针对利用3种检测方法即电化学、荧光和比色法发展的适配子传感器的研究进展进行综述,并对适配子传感器的发展进行了展望。     

氧气传感器的原理及其在不同气体环境中使用的注意事项

在“模拟雷雨条件下氮气和氧气反应的数字化实验探究”中,使用氧气传感器,出现“不降反升”的问题。查阅氧气传感器的型号,经过对其原理进行分析,得出其实质是利用原电池反应。为验证其反应原理,将氧气传感器分别放置在氯气和二氧化氮气体中测量并绘制数值变化曲线,对数值进行分析,提出使用氧气传感器时的注意事项。     

生物传感器研究进展

本文详细地综述了生物传感器的类型、基本原理、目前的研究现状及应用状况,并预测了其今后的发展趋势。参考文献110篇。     

光电化学传感器的研究进展

光电化学传感器是基于物质的光电转换特性确定待测物浓度的一类检测装置．光电化学检测方法灵敏度高、设备简单、易于微型化,已经成为一种极具应用潜力的分析方法．本文主要介绍光电化学传感器的基本原理、特点、分类,并对有代表性的研究和发展前景做了总结和评述．     

硫化氢气体传感器的研究进展

硫化氢(H_2S)是一种具有臭鸡蛋气味的腐蚀性气体,是广泛存在的环境污染物之一。H_2S为剧毒性气体,且易挥发,严重损伤人的呼吸系统,甚至神经系统和心脏器官。因此,实现H_2S气体的快速、高灵敏及实时检测对于工业生产、公共安全、环境监测和医疗健康等领域具有十分重要的意义。该文对近5年来电量型和光学型两类H_2S气体传感器在传感技术和传感材料上取得的重要进展进行了综述,并对这两类传感器所面临的问题和未来发展趋势进行了探讨。     

双原色发光比色氧传感器

简单、快速进行氧检测的方法一直是人们研究的热点.在众多检测氧的方法中,发光比色法由于简单和可直读的特性受到人们的广泛关注.本文将简单地介绍近几年国内外基于双原色发光比色氧传感器的研究进展,并展望其研究前景.     

A new sensing material for optical oxygen measurement,with the indicator embedded in an aqueous phase

A new type of oxygen-sensitive material is obtained by preparing an aqueous emulsion of a solution of an oxygen-sensitive fluorescent dye in a rigid polymer. The fluorescence of this emulsion is related to the oxygen partial pressure, but a Stern-Volmer plot is not linear over the whole pressure range. Aside from high sensitivity and specificity for oxygen, this new type of sensing material has favorable analytical wavelengths allowing the use of low-cost opto-electronic equipment. Since the indicator is embedded in an aqueous environment, the sensor should be capable of monitoring various kinds of reactions occurring in the aqueous phase, for instance enzymatic reactions which are accompanied by production or consumption of oxygen.     

Progress in the studies of photoelectrochemical sensors

Photoelectrochemical sensor is a new kind of developing analytical device based on the photoelectrochemical properties of materials. Because of its remarkable sensitivity, inherent miniaturization, portability and easy integration, photoelectrochemical analysis is becoming a promising analytical technique. This review focuses on the basic principles, classification, characteristics, and research progress of photoelectrochemical sensors with 94 references. The prospect of the development of photoelectrochemical sensors is also evaluated and discussed.     

MOFs传感器在癌症及其生物标志物检测中的应用

癌症是世界上最致命的疾病之一,因此癌细胞的有效捕获和敏感检测对基础研究以及临床诊断和治疗都具有重要意义.基于金属有机骨架(MOFs)的催化活性和固有的发光性能等特点,MOFs已被成功地开发为传感平台实现对癌症及其标志物的检测.综述了基于MOFs的电化学、荧光、电化学发光、比色传感器在癌细胞及核酸、蛋白质等生物标志物检测...     

Plastic colorimetric film sensors for gaseous ammonia

The preparation and characterization of three different plastic thin-film colorimetric sensors for gaseous ammonia is described. In the film sensors, the neutral form of a pH-sensitive dye (Bromophenol Blue, Bromocresol Green or Chlorophenol Red) was encapsulated in a plastic medium, either poly(vinyl butyral) or ethylcellulose plasticized with tributyl phosphate. Each of these film optodes gave a reproducible and reversible response towards gaseous ammonia. The sensitivity of the film sensors towards ammonia was found to be strongly dependent upon the pK _a of the encapsulated dye. Thus, the film with Chlorophenol Red (pK _a = 6.25), proved to be very insensitive (operating range: 0.29% < %NH₃ < 100%), whereas the film with Bromophenol Blue (pK _a = 4.1), was much more sensitive (operating range: 0.0003% < %NH₃ < 0.11%). The sensitivity of a plastic film sensor decreased markedly with increasing operating temperature and the 90% response (15–38 s) and recovery (820-127 s) times were slow and activation-controlled.     

钯卟啉室温燐光氧传感器的研究

以Dowex 5 0× 2 1 0 0树脂为载体固定四 (三甲氨基苯基 )钯卟啉 (Pd TAPP) ,利用其光被氧猝灭的特性 ,采用流动注射分析 (FIA)技术 ,制成氧传感器。该方法响应快 (响应时间从氮气到氧气为 1 8s,反之为86s) ,灵敏度高 (I0 I1 0 0 值为 5 .6) ,检测限可达 0 .0 9% (V V)。     

Electrochemical sensing chemical oxygen demand based on the catalytic activity of cobalt oxide film

Cobalt oxide sensing film was in situ prepared on glassy carbon electrode surface via constant potential oxidation. Controlling at 0.8 V in NaOH solution, the high-valence cobalt catalytically oxidized the reduced compounds, decreasing its surface amount and current signal. The current decline was used as the response signal of chemical oxygen demand (COD) because COD represents the summation of reduced compounds in water. The surface morphology and electrocatalytic activity of cobalt oxide were readily tuned by variation of deposition potential, time, medium and Co²⁺ concentration. As confirmed from the atomic force microscopy measurements, the cobalt oxide film, that prepared at 1.3 V for 40 s in pH 4.6 acetate buffer containing 10 mM Co(NO₃)₂, possesses large surface roughness and numerous three-dimensional structures. Electrochemical tests indicated that the prepared cobalt oxide exhibited high electrocatalytic activity to the reduced compounds, accompanied with strong COD signal enhancement. As a result, a novel electrochemical sensor with high sensitivity, rapid response and operational simplicity was developed for COD. The detection limit was as low as 1.1 mg L⁻¹. The analytical application was studied using a large number of lake water samples, and the accuracy was tested by standard method.     

Effect of morphology on organic thin film transistor sensors

This review provides a general introduction to organic field-effect transistors and their application as chemical sensors. Thin film transistor device performance is greatly affected by the molecular structure and morphology of the organic semiconductor layer. Various methods for organic semiconductor deposition are surveyed. Recent progress in the fabrication of organic thin film transistor sensors as well as the correlation between morphology and analyte response is discussed.