2012 ©
Journal Publication
Title of Article Fluorescence switching sensor based on graphene quantum dots decorated with Hg2+ and hydrolyzed thioacetamide for highly Ag+ -sensitive and selective detection 
Date of Acceptance 2 October 2017 
     Title of Journal RSC advances 
     Standard ISI 
     Institute of Journal the royal socity of chemistry 
     Year of Publication 2017 
     Abstract A selective fluorescence sensor for the determination of silver ion (Ag+) was developed based on graphene quantum dots (GQDs). The GQDs were prepared by the citric acid pyrolysis method. In the presence of mercury ion (Hg2+), the fluorescence intensity of GQDs decreased linearly and it was fully recovered by hydrolysis of thioacetamide (TAA), giving hydrogen sulfide in the reaction system. This research study was aimed to use as fluorescent turn-off sensor for the selective determination of Ag+. Upon the addition of Ag+, the fluorescence intensity of the generated sulfide-(Hg2+ quenched GQDs) decreased as a linear function of the Ag+ concentration. Then, the acquired GQDs showed steady, selective, and highly sensitive detection of Ag+. The experimental parameters affecting the fluorescence turn-on/off sensor were investigated and optimized. The optimum conditions included 4 μM Hg2+ concentration,70 μM TAA concentration, solution pH 7 and 5 min reaction time. Under the optimized conditions, working linear concentration range, the limit of detection and limit of quantification for Ag+ were 0.5-10.0, 0.18 and 0.60 μM, respectively. The proposed method was successfully applied for the selective determination of trace amounts of Ag+ in five real water samples with satisfied recoveries (89.31-114.08%). 
     Keyword Fluorescence sensor, graphene quantum dots, mercury, silver, thioacetamide, 43 water sample 
555020073-6 Miss PIMPISA KAEWANAN [Main Author]
Science Master's Degree
Science Doctoral Degree
Science Doctoral Degree
Science Master's Degree
557020018-8 Miss THITIYA SRIPAKDEE
Science Doctoral Degree

Reviewing Status มีผู้ประเมินอิสระ 
Status ได้รับการตอบรับให้ตีพิมพ์ 
Level of Publication นานาชาติ 
citation true 
Part of thesis true 
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