TY - JOUR

T1 - Integration of Highly Sensitive Oxygenated Graphene With Aluminum Micro-Interdigitated Electrode Array Based Molecular Sensor for Detection of Aqueous Fluoride Anions

AU - Soni, Mahesh

AU - Arora, Tarun

AU - Khosla, Robin

AU - Kumar, Pawan

AU - Soni, Ajay

AU - Sharma, Satinder K.

PY - 2016/3/1

Y1 - 2016/3/1

N2 - High sensitivity and reliability of graphene oxide (GO) integrated with aluminum (Al) micro-interdigitated electrodes (μ-IDEs) patterned on p-Si for the detection of aqueous fluoride anion (F - ) is demonstrated. The strong molecular interaction, hydrogen bonding, and ionic conduction between the oxygen containing functional groups (epoxy (1, 2-ether), hydroxyl, carbonyl, and carboxyl) onto GO and F - are investigated by electrical and optical techniques. The GO/Al (μ-IDEs)/p-Si sensor system shows ~82% increase in the sensing signal for 0.1 ppm GO + F - solution with respect to GO. The response of the sensor for 1, 10, 100, and 1000 ppm of GO + F - solution shows almost 220, 415, 500, and 305 times increase in sensing signal with respect to GO. The significant enhancement in sensor response at lower concentration (0.1-100 ppm) of F - is observed. However, at high concentration (1000 ppm) of F - , the interlayer swelling and the expansion of GO dominate and result the reduction in sensing response of GO/Al (μ-IDEs)/p-Si sensor. The Fourier transform infrared spectroscopy (FT-IR) spectra show the decrease in -OH, C-O-C, and CLO absorption peaks of GO with an increasing aqueous F - concentration, supporting the reduction in sensing response at 1000 ppm. The response of GO/Al (μ-IDEs)/p-Si sensor is favorable for use in graphene-based electronics sensors.

AB - High sensitivity and reliability of graphene oxide (GO) integrated with aluminum (Al) micro-interdigitated electrodes (μ-IDEs) patterned on p-Si for the detection of aqueous fluoride anion (F - ) is demonstrated. The strong molecular interaction, hydrogen bonding, and ionic conduction between the oxygen containing functional groups (epoxy (1, 2-ether), hydroxyl, carbonyl, and carboxyl) onto GO and F - are investigated by electrical and optical techniques. The GO/Al (μ-IDEs)/p-Si sensor system shows ~82% increase in the sensing signal for 0.1 ppm GO + F - solution with respect to GO. The response of the sensor for 1, 10, 100, and 1000 ppm of GO + F - solution shows almost 220, 415, 500, and 305 times increase in sensing signal with respect to GO. The significant enhancement in sensor response at lower concentration (0.1-100 ppm) of F - is observed. However, at high concentration (1000 ppm) of F - , the interlayer swelling and the expansion of GO dominate and result the reduction in sensing response of GO/Al (μ-IDEs)/p-Si sensor. The Fourier transform infrared spectroscopy (FT-IR) spectra show the decrease in -OH, C-O-C, and CLO absorption peaks of GO with an increasing aqueous F - concentration, supporting the reduction in sensing response at 1000 ppm. The response of GO/Al (μ-IDEs)/p-Si sensor is favorable for use in graphene-based electronics sensors.

U2 - 10.1109/jsen.2015.2505782

DO - 10.1109/jsen.2015.2505782

M3 - Journal article

VL - 16

SP - 1524

EP - 1531

JO - IEEE Sensors Journal

JF - IEEE Sensors Journal

SN - 1530-437X

IS - 6

ER -