Accelerated automated screening of viscous graphene suspensions with various surfactants for optimal electrical conductivity
Accelerated automated screening of viscous graphene suspensions with various surfactants for optimal electrical conductivity
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DOI：
10.1039/d1dd00008j
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发表时间：
2022-04-11
期刊：
影响因子：
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通讯作者：
Hippalgaonkar, Kedar
中科院分区：
文献类型：
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作者：
Bash, Daniil;Chenardy, Frederick Hubert;Hippalgaonkar, Kedar
功能复合薄膜在柔性和/或电子设备、电信和多功能新兴涂层中具有广泛的应用。快速筛选其特性是一项具有挑战性的任务，尤其是在多个成分定义目标特性的情况下。在这项工作中，我们提出了一个加速自动筛选粘性石墨烯悬浮液以获得最佳电导率的平台。我们使用 Opentrons OT2 机器人自动移液器，通过在羟丙基甲基纤维素水溶液中制备 288 个石墨烯悬浮液样品，测试了 3 种工业上最重要的表面活性剂 - PVP、SDS 和 T80。然后，通过我们定制的电动 4 点探针测量装置和计算机视觉算法，我们测量了每个样品的电导率，并发现基于 PVP 的样品实现了最高性能，峰值为 10.8 mS cm-1，无需退火。实验过程的自动化使我们能够使用机器人执行大部分实验，而人类研究人员的参与则保持在最低限度。总体而言，实验在不到 18 小时内完成，其中只有 3 个小时涉及人类。我们以机器人方式生产 288 个全因子采样、独特的基于石墨烯的滴铸薄膜，执行自动计算机视觉检测，然后进行厚度和电导率测量，将人工时间减少到工作流程的 17%。
Functional composite thin films have a wide variety of applications in flexible and/or electronic devices, telecommunications and multifunctional emerging coatings. The rapid screening of their properties is a challenging task, especially with multiple components defining the targeted properties. In this work we present a platform for accelerated automated screening of viscous graphene suspensions for optimal electrical conductivity. Using an Opentrons OT2 robotic auto-pipettor, we tested 3 most industrially significant surfactants - PVP, SDS and T80 - by fabricating 288 samples of graphene suspensions in aqueous hydroxypropylmethylcellulose. Enabled by our custom motorized 4-point probe measurement setup and computer vision algorithms, we then measured the electrical conductivity of every sample and identified that the highest performance is achieved for PVP-based samples, peaking at 10.8 mS cm-1 without annealing. The automation of the experimental procedure allowed us to perform the majority of the experiments using robots, while the involvement of human researchers was kept to minimum. Overall the experiment was completed in less than 18 hours, only 3 of which involved humans.We robotically produce 288, full-factorial sampled, unique graphene-based drop-casted films, perform automated computer-vision detection followed by thickness and electrical conductivity measurements minimizing human time to similar to 17% of the workflow.