Hydrogel-Fractal Piezoelectric Bilayer Transducer for Wireless Biochemical Sensing
Hydrogel-Fractal Piezoelectric Bilayer Transducer for Wireless Biochemical Sensing
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DOI：
10.1109/embc44109.2020.9175819
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发表时间：
2020-07
期刊：
影响因子：
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通讯作者：
Sayemul Islam;Moonchul Park;S. Song;Albert Kim
中科院分区：
文献类型：
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作者：
Sayemul Islam;Moonchul Park;S. Song;Albert Kim
本文报道了一种新型的无线生化传感器。双层传感器由分形压电薄膜和pH敏感化学机械水凝胶组成，克服了化学和生化传感中的许多缺点。压电薄膜的分形设计通过采用周期性重复的孔结构来增强频率响应和线性度。作为孔隙的基础，希尔伯特空间填充曲线与修改。在分形压电膜的表面上，层叠有水凝胶。当双层换能器被引入pH环境（例如，pH = 4、8和12）时，水凝胶溶胀（或收缩）并引起双层换能器的卷曲（10.47°/pH）。当双层换能器被激励时，曲率然后表现出各种超声响应。当曲率角为30°、60°和120°时，使用超声接收器测量的电压输出分别为0.393、0.341和0.250 mV/cm 2。总体pH灵敏度为0.017 mV/cm 2/pH。最终，使用新型双层超声换能器的生化传感原理表明，与传统的生化传感相比，该系统简单、低成本、无电池且远距离无线读出。
This paper reports on a novel transducer for wireless biochemical sensing. The bilayer transducer consists of a fractal piezoelectric membrane and pH-sensitive chemo-mechanical hydrogel, which overcomes many shortcomings in the chemical and biochemical sensing. The fractal design on the piezoelectric membrane enhances frequency response and linearity by employing periodically repeated pore architecture. As a basis of the pore, a Hilbert space-filling curve with modifications is used. On the surface of the fractal piezoelectric membrane, the hydrogel is laminated. When the bilayer transducer is introduced to a pH environment (e.g., pH = 4, 8, and 12), the hydrogel swells (or shrinks) and induces the curling of the bilayer transducer (10.47°/pH). The curvature then exhibits various ultrasound responses when the bilayer transducer was excited. The measured voltage outputs using an ultrasonic receiver were 0.393, 0.341, 0.250 mV/cm2 when curvature angles were 30°, 60°, and 120°, respectively. Overall pH sensitivity was 0.017 mV/cm2/pH. Ultimately, the biochemical sensing principle using a novel bilayer ultrasound transducer suggests a simple, low-cost, battery-less, and long-range wireless readout system as compared to traditional biochemical sensing.