Ferroelectric Self-Assembled Monolayers as Pyroelectric Materials

9361602罗宾逊这个小型企业创新研究项目是在分析化学仪器的一般领域，特别是在热探测器的子领域。热释电热敏探测器传统上是基于电场取向的无机铁电单晶或铁电有机聚合物薄膜。在这一阶段的研究中，我们将利用长链烷基硫醇在金表面的自组装单分子膜(SAM)的氟化反应来制备热释电薄膜。预计偶极自组元将是稳定、坚固和热释电的。热释电系数和优值系数将作为烷基硫醇链长度和氟化度的函数来确定。如果能够制造出具有比目前使用的材料更好的热释电性能的自组装膜，第二阶段的研究将针对制造热释电装置的原型。基于氟化自组装膜的热释电探测器具有结构紧凑、成本低、可与放大器集成到单片硅片上并可在室温下工作等优点。自支单分子膜的低热质量和低介电常数使其灵敏度和响应时间比目前的聚合物热释电材料更好。***

9361602 Robinson This Small Business Innovation Research (SBIR) project is in the general area of analytical chemical instrumentation and specifically in the subfield of thermal detectors. Pyroelectric thermal detectors traditionally are based on inorganic ferroelectric single crystals or ferroelectric organic polymer films which are oriented in an electric field. In this Phase I study pyroelectric films will be prepared by fluorination of self assembled monolayers (SAM) of long chain alkylthiols on gold surfaces. Dipolar SAMs are expected to be stable, robust and pyroelectric. Pyroelectric coefficients and figures of merit will be determined as a function of alkylthiol chain length and degree of fluorination. If SAMs can be made with pyroelectric properties better than currently used materials, Phase II studies will be directed towards fabricating a prototype pyroelectric device. %%% Pyroelectric detectors based on fluorinated SAMs are expected to be compact, low cost, and capable of being integrated with an amplifier onto a single silicon chip and operated at room temperature. The low thermal mass and low dielectric constant of a free-standing monolayer should make its sensitivity and response time better than current polymer pyroelectric materials. ***