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Graphite-like bulk NbTe 2 powders were prepared by a facile solid phase synthesis process and ultrathin NbTe 2 nanosheets were obtained by using wet ball milling induced delamination. The X-ray diffraction analysis illustrated that the reduction of particle size was mainly along the stacking direction of the basal planes without great influence on the short range order of NbTe 2 crystals. Scanning electron microscopy, transmission electron microscopy, and atomic force microscope observations revealed that the longitudinal dimension of NbTe 2 samples changed into the nanoscale from the larger micron level after mechanical exfoliation. The exfoliated NbTe 2 nanosheets had better longterm dispersion stability in paraffin oil than bulk NbTe 2 . The tribological properties were determined on an UMT-2 ball-on-disk friction and wear tester. The results indicated that the paraffin oil with NbTe 2 nanosheets exhibited better lubricating behaviors with the lower friction coefficient and wear rate in comparison with the bulk NbTe 2 . It was demonstrated that NbTe 2 nanosheets could easily enter into a point of friction contact, and form an available tribofilm to prevent the direct contact between counterparts during the friction process. Furthermore, this work shows the potential applications of ultrathin NbTe 2 nanosheets in the field of tribology.

A new glucometer-based enzyme immunoassay was developed for the sensitive detection of alpha-fetoprotein using biofunctional dendritic polyaniline nanofibers as the signal-transduction tag.