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ACS Applied Materials & Interfaces · 2017 · IF 7.504

Ultrasensitive Pressure Sensor Based on an Ultralight Sparkling Graphene Block

Lingxiao Lv,Panpan Zhang,Tong Xu,Liangti Qu

Herein, we develop a supersensitive pressure sensor based on a fully air-bubbled ultralight graphene block through a simple sparkling strategy. The obtained sparkling graphene block (SGB) exhibits excellent elasticity even at 95% compressive strain and rebounds a steel ball with an ultrafast recovery speed (∼1085 mm s–1). Particularly, the SGB-based sensor reveals a record pressure sensitivity of 229.8 kPa–1, much higher than other graphene materials, because of the highly cavity-branched internal structure. Impressively, the pressure sensor can detect the extremely gentle pressures even beyond the real human skin and hence are promising for ultrasensitive sensing applications.

CAS / MDL: 9005-65-6

研究领域: 材料科学 · 传感器技术

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Advanced Energy Materials · 2018 ·Vol. 8 ·期 30 ·1802042 · IF 21.875

Edge-Nitrogen-Rich Carbon Dots Pillared Graphene Blocks with Ultrahigh Volumetric/Gravimetric Capacities and Ultralong Life for Sodium-Ion Storage

Zheng Liu,Longhai Zhang,Lizhi Sheng,Qihang Zhou,Tong Wei,Jing Feng,Zhuangjun Fan

The development of stable electrode materials for sodium-ion batteries (NIBs) with excellent rate capacity, high volumetric/gravimetric capacity, and ultralong-term cycling stability still remains a challenge. Herein, a novel strategy for the synthesis of edge-nitrogen-rich carbon dots pillared graphene blocks (N-CDGB) through self-polymerization of aniline into graphene oxide blocks, and subsequent carbonization is developed. Due to high bulk density (1.5 g cm −3 ) and integrated lamellar structure with large edge-interlayer spacing (4.2 Å) pillared by nitrogen-doped carbon dots (95% edge-nitrogen content), the dense N-CDGB shows robust structural stability, fast ion/electron transfer pathways, and more active sites for sodium storage. As a result, the N-CDGB electrode exhibits ultrahigh reversible volumetric and gravimetric capacities (780 mAh cm −3 /520 mAh g −1 at 0.02 A g −1 ) far exceeding those of graphene (108 mAh cm −3 /290 mAh g −1 ) and hard carbon (297 mAh cm −3 /311 mAh g −1 ), excellent rate capability (118 mAh g −1 /177 mAh cm −3 at 10 A g −1 ), and superior cycling stability up to 10 000 cycles with almost no capacity loss at 10 A g −1 . This work signifies the superiority of densely pillared structure in the future development of NIBs with high volumetric/gravimetric capacity and ultralong-term cycling stability.

研究领域: 材料科学 · 储能 · 电化学 · 纳米材料 · 电池技术

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Ultrasensitive Pressure Sensor Based on an Ultralight Sparkling Graphene Block

Edge-Nitrogen-Rich Carbon Dots Pillared Graphene Blocks with Ultrahigh Volumetric/Gravimetric Capacities and Ultralong Life for Sodium-Ion Storage