Ferroelectric Self-Assembled Monolayers as Pyroelectric Materials

这个小企业创新研究（SBIR）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。传统的热释电探测器是基于无机铁电单晶或铁电有机聚合物薄膜，它们在电场中取向。在这个第一阶段的研究中，热释电薄膜将通过在金表面上的长链烷基硫醇自组装单层（SAM）的氟化来制备。偶极地对空导弹具有稳定性、鲁棒性和热释电性。热释电系数和优值将作为烷基硫醇链长度和氟化程度的函数来确定。如果能使地对空导弹具有比目前使用的材料更好的热释电特性，第二阶段的研究将直接针对制造一个热释电装置的原型。基于氟化地对空导弹的热释电探测器预计结构紧凑，成本低，能够与放大器集成到单个硅芯片上，并在室温下工作。独立单层材料的低热质量和低介电常数使其灵敏度和响应时间优于目前的聚合物热释电材料。＊＊＊

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. ***