High-performance and low-cost ion sensitive sensor array based on self-assembled graphene

Zhang, B.; Cui, Tianhong

doi:10.1109/memsys.2011.5734685

2011 IEEE 24th International Conference on Micro Electro Mechanical Systems 2011

DOI: 10.1109/memsys.2011.5734685

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High-performance and low-cost ion sensitive sensor array based on self-assembled graphene

B. Zhang

Tianhong Cui

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Cited by 2 publications

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“…where r is instantaneous relative resistance change ΔR/R 0 , r 0 is the initial r after Pb 2+ ion introduction, r f is the final r when the output signal is stable, t is the time, and τ is time constant. The extracted time constant τ is only 5 s for a concentration of 100 ppb as shown in the inset of Figure 4b, better than graphene based ion sensors reported 29,30 (10 and 15 s, respectively). This fast response rate indicates the equilibrium between absorption and desorption of ions on BP surface was established very quickly.…”

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confidence: 82%

Air-Stable Black Phosphorus Devices for Ion Sensing

Zhang

Liu

et al. 2015

ACS Appl. Mater. Interfaces

154

110

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Black phosphorus (BP) is one of the most attractive graphene analogues, and its properties make it a promising nanomaterial for chemical sensing. However, mono- and few-layer BP flakes are reported to chemically degrade rapidly upon exposure to ambient conditions. Therefore, little is known about the performance and sensing mechanism of intrinsic BP, and chemical sensing of intrinsic BP with acceptable air stability remains only theoretically explored. Here, we experimentally demonstrated the first air-stable high-performance BP sensor using ionophore coating. Ionophore-encapsulated BP demonstrated significantly improved air stability. Its performance and sensing mechanism for trace ion detection were systematically investigated. The BP sensors were able to realize multiplex ion detection with superb selectivity, and sensitive to Pb(2+) down to 1 ppb. Additionally, the time constant for ion adsorption extracted was only 5 s. The detection limit and response rate of BP were both superior to those of graphene based sensors. Moreover, heavy metal ions can be effectively detected over a wide range of concentration with BP conductance change following the Langmuir isotherm for molecules adsorption on surface. The simplicity of this ionophore-encapsulate approach provides a route for achieving air-stable intrinsic black phosphorus sensors that may stimulate further fundamental research and potential applications.

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confidence: 82%

Air-Stable Black Phosphorus Devices for Ion Sensing

Zhang

Liu

et al. 2015

ACS Appl. Mater. Interfaces

154

110

View full text Add to dashboard Cite

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Adhesion energy of few layer graphene characterized by atomic force microscope

You

Cui

2014

Sensors and Actuators A: Physical

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High-performance and low-cost ion sensitive sensor array based on self-assembled graphene

Cited by 2 publications

References 7 publications

Air-Stable Black Phosphorus Devices for Ion Sensing

Air-Stable Black Phosphorus Devices for Ion Sensing

Adhesion energy of few layer graphene characterized by atomic force microscope

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