Pico-molar level detection of copper ion with extraordinarily high response by Ti-doped copper nitride fabricated via high power impulse magnetron sputtering

Biring, Sajal; Sadhu, Annada Sankar; Chuang, Min-Chen; Chien, Kuan-Yu; Sun, Hui; Chen, Sheng-Chi

doi:10.1016/j.snb.2022.131632

Cited by 3 publications

(1 citation statement)

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“…[1][2][3][4] Among them, the accumulation of copper ions (Cu 2+ ) in organisms/humans through the alimentary chain can cause serious diseases such as cancer, central lesion, and kidney failure. [5][6][7][8] It is necessary to detect trace Cu 2+ in seawater.…”

Section: Introductionmentioning

confidence: 99%

Photo‐Assisted Barrier Effect for Improving the Sensing Performance to Copper Ions

Liang

Wang

et al. 2022

Adv Materials Inter

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complex operation, and not suitable for online detection. By contrast, electrochemical method has the simple, fast and sensitive advantages. [11,12] However, its sensing mechanism often relies on redox reactions, it is easily interfered by substances with similar properties. [13] It is desired to create a new electrochemical sensing mode to resist seawater interference.It is well known that heterojunctions coupling by two semiconductors can exhibit specific functions in catalysis, sensor, energy storage, and conversion. [14][15][16] For example, the ZnO/Co 3 O 4 heterojunction modified by polydopamine has high selectivity and active catalytic performance for CO 2 . [17] CuO/Cu 2 O heterojunction has excellent contribution to improve the detection performance of l-cysteine. [18] At heterojunction interface, semiconductors with different work functions can build a barrier by spontaneous flow of electrons and band bending. Since barrier blocks electron transport, its change can affect electrochemical impedance during electrochemical sensing process. [19,20] Therefore, the barrier mechanism can be used as a valuable tuning factor in electrochemical detection. Different heterojunctions can form different types of barrier, such as Schottky barrier, p-n junction barrier and n-n junction barrier. Among them, n-n junction is formed by the contact of two n-type semiconductors with different work functions. Since most carriers of n-type semiconductor are electrons, it is expected to achieve better electronic regulation ability.As a wide-gap (3.2 eV) n-type semiconductor, TiO 2 has good light response and band regulation ability. [21,22] In 2 O 3 is an indirect band gap (2.8 eV) n-type semiconductor with excellent electrical conductivity and photoelectric chemical stability. [23,24] The appropriate band structure and work functions make them form n-n junction barrier. Since both TiO 2 and In 2 O 3 have good photoelectric characteristics, it is expected to realize good light regulation. Chitosan (CS), as a functional polymer with strong adhesiveness and film-forming property, can selectively absorb Cu 2+ through NH 2 chelation. [25,26] In addition, CS has light transmittance and does not affect the photoexcitation of semiconductor.In this work, the Ti/TiO 2 /In 2 O 3 /CS wire was fabricated by assembling Ti wire for electrochemical detection of Cu 2+ . The photo-assisted adjusting effect of n-n junction barrier on electrochemical response was studied. It is found that barrier can be used as an electrochemical driver to generateCopper ions (Cu 2+ ) pollution poses a serious threat to Marine ecology and fisheries, but the online detection is difficult due to seawater interference. Herein, photo-assisted barrier effect is introduced into electrochemical detection as a driver to generate electrochemical response. The n-n junction barrier exhibits excellent adjusting effect on electrochemical response under photoexcitation and could effectively drive electrochemical response by Cu 2+ adsorption. The prepared Ti/TiO 2 /In 2 O 3 /C...

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