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Research Article Issue
Coaxial fiber organic electrochemical transistor with high transconductance
Nano Research 2023, 16 (9): 11885-11892
Published: 29 April 2023
Downloads:43

Fiber organic electrochemical transistors (OECTs) have received extensive attention in wearable and implantable biosensors because of their high flexibility and low working voltage. However, the transconductance of fiber OECTs is much lower compared with the planar counterparts, leading to low sensitivity. Here, we developed fiber OECTs in a coaxial configuration with microscale channel length to achieve the highest transconductance of 135 mS, which is one to two orders of magnitude higher than that of the state-of-the-art fiber OECTs. Coaxial fiber OECT based sensors showed high sensitivities of 12.78, 20.53 and 3.78 mA/decade to ascorbic acid, hydrogen peroxide and glucose, respectively. These fiber OECTs were woven into a fabric to monitor the glucose in sweat during exercise and implanted in mouse brain to detect ascorbic acid. This coaxial architectural design offers an effective way to promote the performance of fiber OECTs and realize highly sensitive detection of biochemicals.

Research Article Issue
A hybrid carbon aerogel with both aligned and interconnected pores as interlayer for high-performance lithium–sulfur batteries
Nano Research 2016, 9 (12): 3735-3746
Published: 13 September 2016
Downloads:20

The soluble nature of polysulfide species created on the sulfur electrode has severely hampered the electrochemical performance of lithium–sulfur (Li–S) batteries. Trapping and anchoring polysulfides are promising approaches for overcoming this issue. In this work, a mechanically robust, electrically conductive hybrid carbon aerogel (HCA) with aligned and interconnected pores was created and investigated as an interlayer for Li–S batteries. The hierarchical cross-linked networks constructed by graphene sheets and carbon nanotubes can act as an "internet" to capture the polysulfide, while the microand nano-pores inside the aerogel can facilitate quick penetration of the electrolyte and rapid transport of lithium ions. As advantages of the unique structure and excellent accommodation of the volume change of the active materials, a high specific capacity of 1, 309 mAh·g-1 at 0.2 C was achieved for the assembled Li–S battery, coupled with good rate performance and long-term cycling stability (78% capacity retention after 600 cycles at 4 C).

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