Details

Autor(en) / Beteiligte

• Lien, Chien-Hung
• Hu, Chi-Chang
• Chang, Kuo-Hsin
• Tsai, Yi-Da
• Wang, David Shan-Hill

Titel

A study on the key factors affecting the sensibility of bismuth deposits toward Sn2+: Effects of bismuth microstructures on the Sn2+ pre-deposition

Ist Teil von

• Electrochimica acta, 2013-08, Vol.105, p.665-670

Ort / Verlag

Elsevier Ltd

Erscheinungsjahr

2013

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• •The preferred orientation of Bi is the key factor determining the Sn2+ sensitivity.•The grain size and preferred orientation ratio of Bi shows a synergistic effect on Sn2+ sensing.•Trace Sn2+ prefers to deposit Bi(110), not following the Bi-alloy amalgams mechanism.•Larger preferred orientation ratios of Bi show higher sensitivity and better detection limit of Sn2+. The pre-deposition of Sn following with the square-wave anodic stripping voltammetric (SWASV) analysis is employed to determine the Sn2+-sensing ability of bismuth-film electrodes (BFEs). The influences of Bi microstructures, such as grain size, preferred orientation ratio between Bi(110) and Bi(012) (denoted as f), and average roughness factor (Ra) of Bi deposits on the Sn2+-sensing ability, are investigated. The preferred orientation ratio is a key factor determining the Sn2+-sensing ability of BFEs meanwhile a synergistic effect between grain size and f on enhancing the current density of Sn2+ sensing is obtained when f is above 0.11. The crystalline facet of Bi(110) favorable for pre-depositing Sn is the main reason enhancing the Sn2+ sensing of Bi deposits. Thus, this work shows that Sn2+ sensing through stripping of pre-deposited Sn on BFEs does not follow the mechanism of forming Bi-alloy amalgams since the successful pre-deposition of trace Sn2+ on Bi strongly depends on the effective exposure of crystalline facet of Bi(110).