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Molybdenum disulfide
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<p>Molybdenum disulfide (or moly) is an <a href="/facts/Inorganic_chemistry/ErD6ypnb">inorganic compound</a> composed of <a href="/facts/Molybdenum/RX6vp2bF">molybdenum</a> and <a href="/facts/Sulfur/IK0amTfM">sulfur</a>. Its <a href="/facts/Chemical_formula/hghUtthl">chemical formula</a> is MoS2. </p><p>The compound is classified as a <a href="/facts/Transition_metal_dichalcogenide/GTXXbDoV">transition metal dichalcogenide</a>. It is a silvery black solid that occurs as the mineral <a href="/facts/Molybdenite/jatlEkxR">molybdenite</a>, the principal ore for molybdenum. MoS2 is relatively unreactive. It is unaffected by dilute <a href="/facts/Acid/FySU18n1">acids</a> and <a href="/facts/Oxygen/acyn6o8r">oxygen</a>. In appearance and feel, molybdenum disulfide is similar to <a href="/facts/Graphite/sSf3KMXr">graphite</a>. It is widely used as a <a href="/facts/Dry_lubricant/N4GgvV41">dry lubricant</a> because of its low <a href="/facts/Friction/d0108Rpu">friction</a> and robustness. Bulk MoS2 is a <a href="/facts/Diamagnetism/dgFavn9K">diamagnetic</a>, <a href="/facts/Indirect_bandgap/9T1kkc6y">indirect bandgap</a> semiconductor similar to <a href="/facts/Silicon/cgWx0hdr">silicon</a>, with a bandgap of 1.23 eV. </p>