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首页> 外文期刊>Nanotechnology >Self-assembled copolymeric nanoparticles as chemically interactive materials for humidity sensors
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Self-assembled copolymeric nanoparticles as chemically interactive materials for humidity sensors

机译：自组装共聚纳米颗粒作为湿度传感器的化学相互作用材料

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Chemical interactive materials (CIM), based on poly(methylmethacrylate-co- bis(benzocyclobutene)) P(MMA-co-BCB) and poly(styrene-co-bis(benzocyclobutene)) P(S-co-BCB) nanoparticles, have been prepared through modified emulsion technique. Experimental conditions, in particular the co-monomer ratio and reaction time, have been tuned to modulate nanoparticles' dimension and optimize their monodispersity. Resistive relative humidity (RH) sensors based on self-assembled copolymeric nanoparticles, cast deposited onto metal interdigitated electrodes (Al, Au, Cr), have been fabricated. The electrical response and the devices' stability have been studied in the range 10-90% RH. Applying 1 V to interdigitated electrodes, a variation of four orders of magnitude, from 10~(-12) to 10~(-8) A, has been observed and a response time of 130 s has been calculated. Response reproducibility and stability have been tested in subsequent cycles of measurements (working times as long as two days and after six months), confirming the stable performance of the CIMs. Copolymeric nanoparticle assembly has also been studied by quartz microbalance (QMB) devices, where phase shift occurred, by varying RH in the range 10-90%. The CIM coated device shows a sensitivity of about 30 Hz/% (at 10-70% RH), that rapidly increases up to about 2000 Hz/% at 90% RH. The results give evidence for versatile applications of P(MMA-co-BCB) and P(S-co-BCB) nanoparticles for sensing applications.
机译：基于聚甲基丙烯酸甲酯-co-双（苯并环丁烯）P（MMA-co-BCB）和聚（苯乙烯-co-双（苯并环丁烯））P（S-co-BCB）纳米粒子的化学相互作用材料（CIM），已经通过改进的乳液技术制备。实验条件，特别是共聚单体比例和反应时间，已经过调整，可调节纳米粒子的尺寸并优化其单分散性。已经制造了基于自组装共聚纳米粒子的电阻式相对湿度（RH）传感器，该传感器浇铸在金属叉指式电极（Al，Au，Cr）上。在10-90％RH的范围内研究了电响应和设备的稳定性。在叉指电极上施加1 V电压，观察到从10〜（-12）到10〜（-8）A四个数量级的变化，并且计算出130 s的响应时间。在随后的测量周期（工作时间长达两天，六个月后）中测试了响应的可重复性和稳定性，从而确认了CIM的稳定性能。还已经通过石英微天平（QMB）设备研究了共聚纳米颗粒组装，其中通过在10-90％的范围内改变RH来发生相移。涂有CIM的设备显示出约30 Hz /％的灵敏度（在10-70％RH下），在90％RH时迅速增加到约2000 Hz /％。结果为P（MMA-co-BCB）和P（S-co-BCB）纳米粒子在传感应用中的广泛应用提供了证据。

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