A study of knowledge, attitudes and practices (KAP) of voluntary HIV counseling and testing (VCT) among rural migrants was conducted in Shanghai, China. An anonymous questionnaire was administered face-to-face. Among 2,690 participants, 78% reported having had lifetime sexual intercourse with 41.3% of singles reporting sexual intercourse, 9.2% having had multiple sex partners in the past year, only 19% of the participants always using condoms whereas 61.6% did not use in their sexual acts in the past month, 80% knew HIV infection was diagnosed through a blood test, 46.5% had heard of VCT ever before, but only 3.5% felt that they were likely to be HIV-infected now or in the future and only 62 (2.3%) had ever had HIV testing with 19 of them getting tested at a VCT site. Gender, working venue, multiple sex partnerships and knowledge of VCT were independently correlated with having had HIV testing. This study suggests that a much greater effort is needed to promote safer sex and to improve VCT knowledge and services among rural migrants particularly those who are engaging in risky behaviors.

Poly(3,4-ethylenedioxythiophene):poly(4-styrenesulfonate) (PEDOT:PSS) doped with multi-walled carbon nanotubes (MWCNTs) films is fabricated on quartz substrates by spin coating method. The effects of MWCNTs on the structure and properties of PEDOT:PSS film have been investigated. X-ray diffractometer (XRD) and Fourier transform Raman spectroscopy (FTRM) show that the crystallization behavior and the main chain of PEDOT:PSS are not changed. Atomic force microscopy (AFM) shows that individual nanotubes are well dispersed in the PEDOT:PSS matrix. Moreover, some nanotubes overlap into a net-like structure, forming new conductive channels, which can enhance efficiently the film conductivity. The conductivity of PEDOT:PSS film doped with a lower percentage of MWCNTs (0.2 wt%) is 9.16 S/cm, higher than that of pure PEDOT:PSS film (0.28 S/cm), although the optical transmission of PEDOT:PSS decreases a little after the addition of MWCNTs. The interaction between MWCNTs and PEDOT:PSS during melt mixing is also given a possible explanation.

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Layered transition-metal dichalcogenides (TMDs) have provided new opportunities for developing inexpensive and earthabundant catalysts for electrochemical hydrogen evolution reaction (HER). As the typical family members, semiconducting MoS 2 has been widely researched for HER electrocatalysis, while it has been rarely investigated for the emerging metallic VS 2 , despite high interest and great potential in this area. Herein, by using ultrasmall monolayer MoS 2 nanodots as size-controlled precursor, a lamellar heterostructure of MoS 2 nanodots and metallic VS 2 nanosheets (MoS 2 NDs/VS 2 ) is in situ hydrothermally integrated. Via tuning the hybridizing level of MoS 2 nanodots, the morphological and structural evolution of the product is explored, and the electrocatalytic HER performances are researched. The optimized hybrid is featured with thinner lamellar heterostructure, upgraded electrical conductivity, increased catalytically active sites and improved intrinsic activity, thus exhibiting significantly enhanced performance for HER electrocatalysis in acidic media. The possible synergistic interaction between the two counterparts is elucidated preliminarily. This work may pave the way for further investigations on TMDs-based heterostructure containing metallic VS 2 nanosheets, which shows great potential in broadening the horizon of electrocatalysis and materials chemistry.

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