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E-wallet is a cutting-edge payment method that fosters cashless transactions and supports the expansion of the digital economy. Hanoi plans to become a digital city and achieve 50% of electrical payments by 2025. Understanding the intention to use e-wallets is crucial for promoting e-payment. This paper explores a hybrid theory of behaviour, including the Technology Acceptance Model (TAM), the Unified Theory of Acceptance and Use of Technology (UTAUT), and the Theory of Planned Behaviour (TPB) to examine the factors influencing undergraduate students’ intention to use e-wallets. Using survey data on 363 students from 12 higher education institutions in Hanoi and the Partial Least Square Structural Equation Model (PLS-SEM) technique, the research findings indicate eight factors influencing students’ behavioural intention toward e-wallets in Hanoi: attitude, cost of e-payment, facilitating conditions, service quality, credibility, ease of use, usefulness, and social influence. Due to its multitude of factors, the proposed model offers high explanatory power. The results suggest implications to help Hanoi boost e-payment and digital transformation.

This paper reports the first attempt to synthesize un-doped spherical Zn 2 GeO 4 stoichiometry and Mn 2+ doped Zn 2 GeO 4 nanoparticles to achieve a controlled luminescence, particularly, by changing Zn:Ge ratio and Mn 2+ concentration during the hydrothermal process. The morphology of the un-doped Zn 2 GeO 4 nanoparticle was depended on the Zn:Ge ratio that was observed to have a nanorod structure to spherelike morphology; however, the morphology of Mn 2+ doped Zn 2 GeO 4 was not changed as the use of Mn 2+ as a dopant. The un-doped Zn 2 GeO 4 showed a broad emission at ³510 nm and its intensities were functioned of Zn:Ge ratio. On the other hand, the Mn 2+ doped Zn 2 GeO 4 showed emission peaks at ³532 nm and they can be attributed to the 4 T 1 ¼ 6 A 1 transition in Mn 2+ ions doped in Zn 2 GeO 4 . These results suggest the effectiveness use of Zn:Ge ratio and Mn 2+ doped Zn 2 GeO 4 in tuning the luminescence of Zn 2 GeO 4 nanoparticles, which are of potential applications as phosphors in wide range of engineered fields, in particular optoelectronics.

TiO2 nanotubes were successfully synthesized by electrochemical method. A fluoride salt mixture was used as an electrolyte for synthesizing TiO2 nanotubes on titanium substrates. In this work, we have reported the synthesis procedure of TiO2 nanotubes and investigated the corrosion resistance of TiO2 nanotubes coated on the Ti substrate. FE-SEM was used to observe the morphology and determine the size of the TiO2 nanotubes. The phase formation and crystal quality of TiO2 nanotubes were studied by XRD measurements. One-microliter distilled water droplets were used to define the wettability of the TiO2 nanotube surfaces by measuring the contact angle. The corrosion resistance behavior of specimens was analyzed in the simulated body fluid solution (SBF) using potentiodynamic polarization tests for potential application as implants.

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